Partial-Interpenetration-Controlled UiO-Type Metal-Organic Framework and its Catalytic Activity.

An unprecedented correlation between the catalytic activity of a Zr-based UiO-type metal-organic framework (MOF) and its degree of interpenetration (DOI) is reported. The DOI of an MOF is hard to control owing to the high-energy penalty required to construct a partially interpenetrated structure. Surprisingly, strong interactions between building blocks (inter-ligand hydrogen bonding) facilitate the formation of partially interpenetrated structures under carefully regulated synthesis conditions. Moreover, catalytic conversion rates for cyanosilylation and Knoevenagel condensation reactions are found to be proportional to the DOI of the MOF. Among MOFs with DOIs in the 0-100% range, that with a DOI of 87% is the most catalytically active. Framework interpenetration is known to lower catalytic performance by impeding reactant diffusion. A higher effective reactant concentration due to tight inclusion in the interpenetrated region is possibly responsible for this inverted result.

Site-Differentiated MnIIFeII Complex Reproducing the Selective Assembly of Biological Heterobimetallic Mn/Fe Cofactors.

Class Ic ribonucleotide reductases (RNRIc) and R2-like ligand-binding oxidases (R2lox) are known to contain heterobimetallic MnIIFeII cofactors. How these enzymes assemble MnIIFeII cofactors has been a long-standing puzzle due to the weaker binding affinity of MnII versus FeII. In addition, the heterobimetallic selectivity of RNRIc and R2lox has yet to be reproduced with coordination complexes, leading to the hypothesis that RNRIc and R2lox overcome the thermodynamic preference for coordination of FeII over MnII with their carefully constructed three-dimensional protein structures. Herein, we report the selective formation of a heterobimetallic MnIIFeII complex accomplished in the absence of a protein scaffold. Treatment of the ligand Py4DMcT (L) with equimolar amounts of FeII and MnII along with two equivalents of acetate (OAc) affords [LMnIIFeII (OAc)2(OTf)]+ (MnIIFeII) in 80% yield, while the diiron complex [LFeIIFeII(OAc)2(OTf)]+ (FeIIFeII) is produced in only 8% yield. The formation of MnIIFeII is favored regardless of the order of addition of FeII and MnII sources. X-ray diffraction (XRD) of single crystals of MnIIFeII reveals an unsymmetrically coordinated carboxylate ligand─a primary coordination sphere feature shared by both RNRIc and R2lox that differentiates the two metal binding sites. Anomalous XRD studies confirm that MnIIFeII exhibits the same site selectivity as R2lox and RNRIc, with the FeII (d6) center preferentially occupying the distorted octahedral site. We conclude that the successful assembly of MnIIFeII originates from (1) Fe-deficient conditions, (2) site differentiation, and (3) the inability of ligand L to house a dimanganese complex.

Bioactive Dimeric Diterpenoids from Taiwania cryptomerioides (Hayata) and Their Biological Activities.

Taiwania cryptomerioides Hayata is an endangered relict plant belonging to Taxodiaceae, and it is also an endemic plant to China. The decay-resistant of Taiwania timber can provide highly quality wood for building and furniture. Plenty of regenerative of leaves of T. cryptomerioides also has been used as a resource for the discovery of new dimeric diterpenoids. In a search for structurally diverse dimeric diterpenoids and potent bioactive isolates, ten new heterodimeric diterpenoids, taiwaniadducts K-T (1-4, 6, 8-11, and 14), along with five known ones (5, 7, 12, 13, and 15), were isolated from the leaves of T. cryptomerioides. These new compounds were defined by comprehensive spectroscopic analyses, putative biosynthetic pathways, and the values of optical. Biologically, anti-multidrug resistance (MDR) activities of compounds were evaluated. Compounds 4 and 10 exerted a 9.18-fold potentiation effect on bortezmib (BTZ) susceptibility at a tested concentration (20 µM) better than the positive control verapamil. The research of the leaves of T. cryptomerioides not only added the new data to the structural diversity and activities of dimeric diterpenoids but also could provide support for the medical and industrial application of the leaves of this endangered relict plant.

Sr(Ag1-x Lix )2 Se2 and [Sr3 Se2 ][(Ag1-x Lix )2 Se2 ] Tunable Direct Band Gap Semiconductors.

Synthesizing solids in molten fluxes enables the rapid diffusion of soluble species at temperatures lower than in solid-state reactions, leading to crystal formation of kinetically stable compounds. In this study, we demonstrate the effectiveness of mixed hydroxide and halide fluxes in synthesizing complex Sr/Ag/Se in mixed LiOH/LiCl. We have accessed a series of two-dimensional Sr(Ag1-x Lix )2 Se2 layered phases. With increased LiOH/LiCl ratio or reaction temperature, Li partially substituted Ag to form solid solutions of Sr(Ag1-x Lix )2 Se2 with x up to 0.45. In addition, a new type of intergrowth compound [Sr3 Se2 ][(Ag1-x Lix )2 Se2 ] was synthesized upon further reaction of Sr(Ag1-x Lix )2 Se2 with SrSe. Both Sr(Ag1-x Lix )2 Se2 and [Sr3 Se2 ][(Ag1-x Lix )2 Se2 ] exhibit a direct band gap, which increases with increasing Li substitution (x). Therefore, the band gap of Sr(Ag1-x Lix )2 Se2 can be precisely tuned via fine-tuning x that is controlled by only the flux ratio and temperature.

Rapid Cs+ Capture via Multiple Supramolecular Interactions in Anionic Metal-Organic Framework Isomers.

Metal-organic frameworks (MOFs) provide an ideal platform for ion exchange due to their high porosity and structural designability; however, developing MOFs that have the essential characteristics for ion exchange remains a challenge. These crucial features include fast kinetics, selectivity, and stability. We present two anionic isomers, DGIST-2 (2D) and DGIST-3 (3D), comprising distinctly arranged 5-(1,8-naphthalimido)isophthalate ligands and In3+ cations. Interestingly, in protic solvents, DGIST-2 transforms into a hydrolytically stable crystalline phase, DGIST-2'. DGIST-2' and DGIST-3 exhibit rapid Cs+ adsorption kinetics, as well as high Cs+ affinity in the presence of competing cations. The mechanism for rapid and selective sorption is explored based on the results of single-crystal X-ray diffraction analysis of Cs+-incorporated DGIST-3. In Cs+-containing solutions, the loosely incorporated dimethylammonium countercation of the anionic framework is replaced by Cs+, which is held in the hydrophobic cavity by supramolecular ion-ion and cation-π interactions.

Mechanochemistry of Group 4 Element-Based Metal-Organic Frameworks.

Mechanochemical synthesis is emerging as an environmentally friendly yet efficient approach to preparing metal-organic frameworks (MOFs). Herein, we report our systematic investigation on the mechanochemical syntheses of Group 4 element-based MOFs. The developed mechanochemistry allows us to synthesize a family of Hf4O4(OH)4(OOC)12-based MOFs. Integrating [Zr6O4(OH)4(OAc)12]2 and [Hf6O4(OH)4(OAc)12]2 under the mechanochemical conditions leads to a unique family of cluster-precise multimetallic MOFs that cannot be accessed by the conventional solvothermal synthesis. Extensive efforts have not yielded an effective pathway for preparing TiIV-derived MOFs, tentatively because of the relatively low Ti-O bond dissociation energy.

A systematic scoping review and thematic analysis of interprofessional mentoring in medicine from 2000 to 2019.

Interprofessional mentoring in palliative care sees different members of the interprofessional team providing holistic, personalised andlongitudinal mentoring support, skills training and knowledge transfer as they mentor trainees at different points along their mentoring journeys. However, gaps in practice and their risk of potential mentoring malpractice even as interprofessional mentoring use continues to grow in palliative medicine underlines the need for careful scrutiny of its characteristics and constituents in order to enhance the design, evaluation and oversight of interprofessional mentoring programmes. Hence, a systematic scoping review on prevailing accounts of interprofessional mentoring in medicine is conducted to address this gap. Using Arksey and O'Malley's (2005) methodological framework for conducting scoping reviews and identical search strategies, 6 reviewers performed independent literature reviews of accounts of interprofessional mentoring published in 10 databases. Braun and Clarke's (2006) thematic analysis approach was adopted to evaluate across different mentoring settings. A total of 11111 abstracts were identified from 10 databases, 103 full-text articles reviewed and 14 full-text articles were thematically analysed to reveal 4 themes: characterizing, implementing, evaluating and obstacles to interprofessional mentoring. Interprofessional mentoring is founded upon a respectful and collaborative mentoring relationship that thrives despite inevitable differences in individual values, ethical perspectives at different career stages within diverse working environments. This warrants effective mentor-mentee trainings, alignment of expectations, roles and responsibilities, goals and timelines, and effective oversight of the programmes. Drawing upon the data provided, an interprofessional mentoring framework is forwarded to guide the design, evaluation and oversight of the programmes.

Training clinical ethics committee members between 1992 and 2017: systematic scoping review.

INTRODUCTION: Clinical ethics committees (CECs) support and enhance communication and complex decision making, educate healthcare professionals and the public on ethical matters and maintain standards of care. However, a consistent approach to training members of CECs is lacking. A systematic scoping review was conducted to evaluate prevailing CEC training curricula to guide the design of an evidence-based approach. METHODS: Arksey and O'Malley's methodological framework for conducting scoping reviews was used to evaluate prevailing accounts of CEC training published in six databases. Braun and Clarke's thematic analysis approach was adopted to thematically analyse data across different healthcare and educational settings. RESULTS: 7370 abstracts were identified, 92 full-text articles were reviewed and 55 articles were thematically analysed to reveal four themes: the design, pedagogy, content and assessment of CEC curricula. CONCLUSION: Few curricula employ consistent approaches to training. Many programmes fail to provide CEC trainees with sufficient knowledge, skills and experience to meet required competencies. Most programmes do not inculcate prevailing sociocultural, research, clinical and educational considerations into training processes nor provide longitudinal support for CEC trainees. Most CEC training programmes are not supported by host institutions threatening the sustainability of the programme and compromising effective assessment and longitudinal support of CEC trainees. While further reviews are required, this review underlines the need for host organisations to support and oversee a socioculturally appropriate ethically sensitive, clinically relevant longitudinal training, assessment and support process for CEC trainees if CECs are to meet their roles effectively.

Enhancing mentoring experiences through e-mentoring: a systematic scoping review of e-mentoring programs between 2000 and 2017.

Mentoring is suffering from a shortage of trained mentors which compromise the efficacy of novice mentoring or mentoring between a senior clinician and a junior clinician. E-mentoring is proposed as a means of supplementing this dominant form of mentoring in medicine by providing accessible, timely and longitudinal support for mentees. However, with little is known about e-mentoring nor its role in a blended mentoring approach, a systematic scoping review is proposed to evaluate these gaps in understanding in order to better understand e-mentoring and assess the viability of employing e-mentoring practice to support novice mentoring. Using Arksey and O'Malley's (Int J Soc Res Methodol 8(1):19-32, 2005) approach, 5 reviewers carried out independent literature reviews of e-mentoring as an adjuvant to novice mentoring in PubMed, Embase, PsycINFO, ERIC, Cochrane Database of Systematic Reviews, Google Scholar, Scopus, GreyLit, OpenGrey, and Web of Science databases. Braun and Clarke's (Qual Res Psychol 3(2):77-101, 2006) thematic analysis approach was used to thematically analyse accounts of e-mentoring across different settings. 6557 abstracts were identified, 109 full text articles were reviewed, and 18 articles were included and thematically analysed. The themes identified include definitions, role, stages, processes, platforms, evaluation, and relationships in e-mentoring. The themes identified provide a clinically relevant definition of e-mentoring, and in highlighting the similarities in the phases of novice and e-mentoring reaffirms the validity of a blended approach as a means of addressing shortfalls in mentoring in medicine.

A systematic scoping review of ethical issues in mentoring in internal medicine, family medicine and academic medicine.

Mentoring's role in medical education is threatened by the potential abuse of mentoring relationships. Particularly affected are mentoring relationships between senior clinicians and junior doctors which lie at the heart of mentoring. To better understand and address these concerns, a systematic scoping review into prevailing accounts of ethical issues and professional lapses in mentoring is undertaken. Arksey and O'Malley's (Int J Soc Res Methodol 8(1):19-32, 2005. https://doi.org/10.1080/1364557032000119616) methodological framework for conducting scoping reviews was employed to explore the scope of ethical concerns in mentoring in general medicine. Databases searcheed included PubMed, ScienceDirect, ERIC, Embase, Scopus, Mednar and OpenGrey. 3391 abstracts were identified from the initialy search after removal of duplicates, 412 full-text articles were reviewed, 98 articles were included and thematically analysed. Unsatisfactory matching, misaligned expectations, inadequate mentor training, cursory codes of conduct, sketchy standards of practice, meagre oversight and unstructured processes have been identified as potential causes for ethical and professional breaches in mentoring practice. Changes in how professionalism is viewed suggest further studies of educational culture should also be carried out. The host organization plays a major role in establishing codes of conduct, expectations, and holistically, longitudinally oversight of the mentoring process and mentoring relationships.

Evaluating assessment tools of the quality of clinical ethics consultations: a systematic scoping review from 1992 to 2019.

BACKGROUND: Amidst expanding roles in education and policy making, questions have been raised about the ability of Clinical Ethics Committees (CEC) s to carry out effective ethics consultations (CECons). However recent reviews of CECs suggest that there is no uniformity to CECons and no effective means of assessing the quality of CECons. To address this gap a systematic scoping review of prevailing tools used to assess CECons was performed to foreground and guide the design of a tool to evaluate the quality of CECons. METHODS: Guided by Levac et al's (2010) methodological framework for conducting scoping reviews, the research team performed independent literature reviews of accounts of assessments of CECons published in six databases. The included articles were independently analyzed using content and thematic analysis to enhance the validity of the findings. RESULTS: Nine thousand sixty-six abstracts were identified, 617 full-text articles were reviewed, 104 articles were analyzed and four themes were identified - the purpose of the CECons evaluation, the various domains assessed, the methods of assessment used and the long-term impact of these evaluations. CONCLUSION: This review found prevailing assessments of CECons to be piecemeal due to variable goals, contextual factors and practical limitations. The diversity in domains assessed and tools used foregrounds the lack of minimum standards upheld to ensure baseline efficacy. To advance a contextually appropriate, culturally sensitive, program specific assessment tool to assess CECons, clear structural and competency guidelines must be established in the curation of CECons programs, to evaluate their true efficacy and maintain clinical, legal and ethical standards.

Nurturing professionalism in medical schools. A systematic scoping review of training curricula between 1990-2019.

Introduction: Professionalism is an evolving, socioculturally informed multidimensional construct that influences doctor-patient relationships, patient satisfaction and care outcomes. However, despite its clinical significance there is little consistency in how professionalism is nurtured amongst medical students. To address this gap a systemic scoping review of nurturing professionalism in medical schools, is proposed.Methods: Levac's framework and the PRISMA-P 2015 checklist underpinned a 6-stage systematic review protocol. Concurrent use of Braun and Clarke's approach to thematic analysis and directed content analysis was used to identify the key elements in nurturing professionalism.Results: 13921 abstracts were identified from six databases, 854 full-text articles reviewed, and 162 full-text included articles were included. The 4 themes identified through thematic analysis are consistent with findings of the directed content analysis. These were the definition of professionalism, the approaches, content, barriers and enablers to teaching professionalism.Conclusion: Informed by a viable definition of professionalism and clear milestones nurturing professionalism nurturing professionalism begins with culturally appropriate training in clinical competence, humanistic qualities and reflective capacity. This process requires effective evaluations of professional identity formation, and the impact of the learning environment underlining the need for longitudinal assessments of the training process.

The impact of death and dying on the personhood of medical students: a systematic scoping review.

BACKGROUND: The re-introduction of medical students into healthcare systems struggling with the COVID-19 pandemic raises concerns as to whether they will be supported when confronted with death and dying patients in resource-limited settings and with reduced support from senior clinicians. Better understanding of how medical students respond to death and dying will inform educationalists and clinicians on how to best support them. METHODS: We adopt Krishna's Systematic Evidence Based Approach to carry out a Systematic Scoping Review (SSR in SEBA) on the impact of death and dying on medical students. This structured search process and concurrent use of thematic and directed content analysis of data from six databases (Split Approach) enhances the transparency and reproducibility of this review. RESULTS: Seven thousand six hundred nineteen were identified, 149 articles reviewed and 52 articles included. The Split Approach revealed similar themes and categories that correspond to the Innate, Individual, Relational and Societal domains in the Ring Theory of Personhood. CONCLUSION: Facing death and dying amongst their patients affect how medical students envisage their personhood. This underlines the need for timely, holistic and longitudinal support systems to ensure that problems faced are addressed early. To do so, there must be effective training and a structured support mechanism.

Understanding the Mentoring Environment Through Thematic Analysis of the Learning Environment in Medical Education: a Systematic Review.

BACKGROUND: Mentoring's success has been attributed to individualised matching, holistic mentoring relationships (MRs) and personalised mentoring environments (MEs). Whilst there is growing data on matching and MRs, a dearth of ME data has hindered development of mentoring programme. Inspired by studies likening MEs to learning environments (LEs) and data highlighting common characteristics between the two, this systematic review scrutinises reports on LEs to extrapolate the findings to the ME context to provide a better understanding of ME and their role in the mentoring process. METHODS: Using identical search strategies, 6 reviewers carried out independent literature reviews of LEs in clinical medicine published between 1 January 2000 and 31 December 2015 using PubMed, ERIC, Cochrane Database of Systematic Reviews, Google Scholar and Scopus databases. Braun and Clarke's (2006) approach to thematic analysis was adopted to circumnavigate LE's evolving, context-specific, goal-sensitive, learner-tutor relationally dependent nature. RESULTS: A total of 4574 abstracts were identified, 90 articles were reviewed, and 58 full-text articles were thematically analysed. The two themes identified were LE structure and LE culture. LE structure regards the framework that guides interactions within the LE. LE culture concerns the values and practices influencing learner-tutor-host organisation interactions. DISCUSSION: LE is the product of culture and structure that influence and are influenced by the tutor-learner-host organisation relationship. LE structure guides the evolving tutor-learner-host organisation relationship whilst the LE culture nurtures it and oversees the LE structure. Similarities between LEs and MEs allow LE data to inform programme designers of ME's role in mentoring's success.

Stimuli-Responsive Ti-Organic Gels and Aerogels Derived from Ti-Oxo Clusters: Hierarchical Porosity and Photocatalytic Activity.

Herein, we report titanium-organic gels (TOGs) as new Ti-oxo-based materials that exhibit stimuli-responsive sol-gel transformations and hierarchical porosity upon the removal of solvent molecules. Heating a solution of Ti-oxo clusters and pyromellitic acid as a tetratopic ligand produces TOGs that readily become sols by applying physical stimuli such as shaking or vortexing under ambient conditions. Porous titanium-organic aerogels (TOAs) were obtained by the CO2 supercritical point drying (CPD) of the TOGs, and their porous structures were characterized by N2 adsorption and desorption isotherm measurements. These TOAs, based on the Ti-oxo clusters, possess hierarchical micro-, meso-, and macropores. Furthermore, accompanying the prominent photochromic phenomena, reduction of Ti4+ to Ti3+ was observed upon UV irradiation. The TOAs were successfully applied in the adsorption and photocatalytic degradation of several dye molecules. This research introduces a versatile method for preparing stimuli-responsive and porous Ti-oxo-based photocatalysts.

Educational roles as a continuum of mentoring's role in medicine - a systematic review and thematic analysis of educational studies from 2000 to 2018.

BACKGROUND: Recent studies have gone to great lengths to differentiate mentoring from teaching, tutoring, role modelling, coaching and supervision in efforts to better understand mentoring processes. This review seeks to evaluate the notion that teaching, tutoring, role modelling, coaching and supervision may in fact all be part of the mentoring process. To evaluate this theory, this review scrutinizes current literature on teaching, tutoring, role modelling, coaching and supervision to evaluate their commonalities with prevailing concepts of novice mentoring. METHODS: A three staged approach is adopted to evaluate this premise. Stage one involves four systematic reviews on one-to-one learning interactions in teaching, tutoring, role modelling, coaching and supervision within Internal Medicine, published between 1st January 2000 and 31st December 2018. Braun and Clarke's (2006) approach to thematic analysis was used to identify key elements within these approaches and facilitate comparisons between them. Stage two provides an updated view of one-to-one mentoring between a senior physician and a medical student or junior doctor to contextualise the discussion. Stage three infuses mentoring into the findings delineated in stage one. RESULTS: Seventeen thousand four hundred ninety-nine citations were reviewed, 235 full-text articles were reviewed, and 104 articles were thematically analysed. Four themes were identified - characteristics, processes, nature of relationship, and problems faced in each of the four educational roles. CONCLUSIONS: Role modelling, teaching and tutoring, coaching and supervision lie within a mentoring spectrum of increasingly structured interactions, assisted by assessments, feedback and personalised support that culminate with a mentoring approach. Still requiring validation, these findings necessitate a reconceptualization of mentoring and changes to mentor training programs and how mentoring is assessed and supported.

A framework for mentoring of medical students: thematic analysis of mentoring programmes between 2000 and 2015.

A consistent mentoring approach is key to unlocking the full benefits of mentoring, ensuring effective oversight of mentoring relationships and preventing abuse of mentoring. Yet consistency in mentoring between senior clinicians and medical students (novice mentoring) which dominate mentoring processes in medical schools is difficult to achieve particularly when mentors practice in both undergraduate and postgraduate medical schools. To facilitate a consistent approach to mentoring this review scrutinizes common aspects of mentoring in undergraduate and postgraduate medical schools to forward a framework for novice mentoring in medical schools. Four authors preformed independent literature searches of novice mentoring guidelines and programmes in undergraduate and postgraduate medical schools using ERIC, PubMed, CINAHL, OVID and Science Direct databases. 25,605 abstracts were retrieved, 162 full-text articles were reviewed and 34 articles were included. The 4 themes were identified-preparation, initiating and supporting the mentoring process and the obstacles to effective mentoring. These themes highlight 2 key elements of an effective mentoring framework-flexibility and structure. Flexibility refers to meeting the individual and changing needs of mentees. Structure concerns ensuring consistency to the mentoring process and compliance with prevailing codes of conduct and standards of practice.

A narrative review of mentoring programmes in general practice.

Mentoring in general practice nurtures personal and professional development among mentees and mentors and enhances organisational productivity. Yet, failure to define it leads to variations in understanding and practice and conflation with other educational approaches. As a result, mentoring in general practice is underutilised and poorly overseen. This review seeks to identify elements among successful mentoring relationships to aid the design of local mentoring programmes. Reports of undergraduate and postgraduate mentoring programmes in general practice were analysed thematically. A literature search of mentoring of junior postgraduates or undergraduates by experienced mentors in general practice between 1 January 2000 and 31 December 2015 was done using PubMed, ERIC, ScienceDirect, Cochrane Database of Systematic Reviews and OVID. A total of 1973 abstracts were retrieved and 9 full-text articles were included and analysed. Three themes were identified, including the initiation of mentoring relationships, the mentoring relationship and the mentoring environment. Successful mentoring programmes pivot upon effective mentoring relationships. Based on the themes identified, a framework to guide practice, structure and oversight of the mentoring process is forwarded. Further context-specific study is needed to ensure the viability of the Mentoring Framework to better employ mentoring in general practice.

Titanium-Carboxylate Metal-Organic Framework Based on an Unprecedented Ti-Oxo Chain Cluster.

Titanium(IV)-based metal-organic frameworks (Ti-MOFs) have received significant attention in recent years due to their numerous photocatalytic applications. We herein prepare the single-crystalline Ti-carboxylate MOF (DGIST-1) composed of an unprecedented Ti-oxo chain cluster and the porphyrinic ligand, TCPP (tetrakis(4-carboxyphenyl)porphyrin). Preformed Ti-oxo clusters were used as Ti4+ sources to avoid the spontaneous hydrolysis and condensation reactions of traditional Ti-alkoxide precursors, thus, enabling the formation of the highly crystalline Ti-MOF. The successfully activated DGIST-1 exhibited a higher surface area (i.e., 1957.3 m2 g-1 ) than previously reported Ti-MOFs due to its high crystallinity. Furthermore, the visible-light-responsive photocatalytic activity of DGIST-1 was confirmed by the simultaneous generation of singlet oxygen (1 O2 ) and superoxide (. O2 - ) species, in addition to the highly efficient and selective oxidation of benzyl alcohol to benzaldehyde.

Controlled Intercalation and Chemical Exfoliation of Layered Metal-Organic Frameworks Using a Chemically Labile Intercalating Agent.

Creating ordered two-dimensional (2D) metal-organic framework (MOF) nanosheets has attracted extensive interest. However, it still remains a great challenge to synthesize ultrathin 2D MOF nanosheets with controlled thickness in high yields. In this work, we demonstrate a novel intercalation and chemical exfoliation approach to obtain MOF nanosheets from intrinsically layered MOF crystals. This approach involves two steps: first, layered porphyrinic MOF crystals are intercalated with 4,4'-dipyridyl disulfide through coordination bonding with the metal nodes; subsequently, selective cleavage of the disulfide bond induces exfoliation of the intercalated MOF crystals, leading to individual freestanding MOF nanosheets. This chemical exfoliation process can proceed efficiently at room temperature to produce ultrathin (∼1 nm) 2D MOF nanosheets in ∼57% overall yield. The obtained ultrathin nanosheets exhibit efficient and far superior heterogeneous photocatalysis performance compared with the corresponding bulk MOF.