Functionalization of a stable AIE-based hydrogen-bonded organic framework for white light-emitting diodes.

Hydrogen-bonded organic frameworks (HOFs) have received tremendous attention in recent years due to the good designability. However, the pure organic nature of HOFs sometimes limits the application development and performance improvement. Functionalizing is an effective strategy to control and modulate material properties, which can achieve properties that cannot be achieved by a pristine material. Herein, a series of HOF-76⊃DSMI were synthesized through functionalizing the stable AIE-based HOF-76 by incorporating a red dye which complements the deficiency of the red component of HOF-76. Then, a single matrix white light-emitting diode (WLED) was fabricated by coating the HOF-76⊃DSMI material on a 460 nm blue LED with CIE chromaticity coordinates of (0.333, 0.329), a correlated colour temperature (CCT) of 5490 K and a colour rendering index (CRI) of 80.

Engineering Supramolecular Binding Sites in a Chemically Stable Metal-Organic Framework for Simultaneous High C2 H2 Storage and Separation.

Developing porous materials to overcome the trade-off between adsorption capacity and selectivity for C2 H2 /CO2 separation remains a challenge. Herein, we report a stable HKUST-1-like MOF (ZJU-50a), featuring large cages decorated with high density of supramolecular binding sites to achieve both high C2 H2 storage and selectivity. ZJU-50a exhibits one of the highest C2 H2 storage capacity (192 cm3 g-1 ) and concurrently high C2 H2 /CO2 selectivity (12) at 298 K and 1 bar. Single-crystal X-ray diffraction studies on gas-loaded ZJU-50a crystal unveil that the incorporated supramolecular binding sites can selectively take up C2 H2 molecule but not CO2 to result in both high C2 H2 storage and selectivity. Breakthrough experiments validated its separation performance for C2 H2 /CO2 mixtures, providing a high C2 H2 recovery capacity of 84.2 L kg-1 with 99.5 % purity. This study suggests a novel strategy of engineering supramolecular binding sites into MOFs to overcome the trade-off for this separation.

Zeolite NPO-Type Azolate Frameworks.

Three-membered rings (3-rings) are an important structural motif in zeolite chemistry, but their formation remains serendipitous in reticular chemistry when designing zeolitic imidazolate frameworks (ZIFs). Herein, we report a design principle for constructing four new ZIFs, termed ZIF-1001 to -1004, from tetrahedral ZnII centers (T), benzotriazolate (bTZ), and different functionalized benzimidazolates (RbIM) that adopt a new zeolite NPO-type topology built from 3-rings. Two factors were critical for this discovery: i) incorporating the bTZ linker within the structures formed 3-rings due to a ∠(T-bTZ-T) angle of 120-130° reminiscent of the ∠(Ge-O-Ge) angle (130°) observed in germanate zeolite-type structures having 3-rings; and ii) RbIM guided the coordination chemistry of bTZ to bind preferentially in an imidazolate-type mode. This series' ability to selectively capture CO2 from high-humidity flue gas and trap ethane from tail gas during shale gas extraction was demonstrated.

Robust and Radiation-Resistant Hofmann-Type Metal-Organic Frameworks for Record Xenon/Krypton Separation.

The discovery of high-performance adsorbents for highly efficient separation of xenon from krypton is an important but challenging task in the chemical industry due to their similar size and inert spherical nature. Herein, we report two robust and radiation-resistant Hofmann-type MOFs, Co(pyz)[Ni(CN)4] and Co(pyz)[Pd(CN)4] (termed as ZJU-74a-Ni and ZJU-74a-Pd), featuring oppositely adjacent open metal sites and perfect pore sizes (4.1 and 3.8 Å) comparable to the kinetic diameter of xenon (4.047 Å), affording the benchmark binding affinity for polarizable Xe gas. These materials thus exhibit both record-high Xe uptake capacities (89.3 and 98.4 cm3 cm-3 at 296 K and 0.2 bar) and Xe/Kr selectivities (74.1 and 103.4) at ambient conditions, all of which are the highest among all the state-of-the-art materials reported so far. The locations of Xe molecules within ZJU-74a-Ni have been visualized by single-crystal X-ray diffraction studies, in which two oppositely adjacent metal centers combined with the right aperture size can construct a unique sandwich-like binding site to offer unprecedented and ultrastrong Ni2+-Xe-Ni2+ interactions with xenon, thus leading to the record Xe capture capacity and selectivity. The excellent separation capacity of ZJU-74a-Pd was verified by breakthrough experiments for Xe/Kr gas mixtures, providing both unprecedentedly high xenon uptake capacity (4.63 mmol cm-3) and krypton productivity (214 cm3 g-1).

Modulator-Induced Zr-MOFs Diversification and Investigation of Their Properties in Gas Sorption and Fe3+ Ion Sensing.

In this paper, we synthesized three Zr-MOFs (Zr-SXU-1, Zr-SXU-2, and Zr-SXU-3) composed of identical ligands and metal clusters by using tetratopic carboxylic ligand PBPTTBA as the ligand and benzoic acids as modulators. These three Zr-MOFs showed different structures and topologies, and the connectivity of the Zr clusters varied from 8 in Zr-SXU-3, to 10 in Zr-SXU-1, and finally to 12 in Zr-SXU-2 due to the modulators used. Among them, Zr-SXU-1 represents an unusual 6-node network and [6(10)(11)7] transitivity. Besides, Zr-SXU-2 can only be obtained by using ditopic carboxylic acid as a second modulator when using benzoic acid as the main modulator, which is not reported in other Zr-MOFs synthesis. The adsorption and luminescence tests demonstrated their potential as gas reservoirs, separators, and sensors and also showed the importance of structure topologies to the applications.

Engineering of Pore Geometry for Ultrahigh Capacity Methane Storage in Mesoporous Metal-Organic Frameworks.

Mesoporous Zn4O(-COO)6-based metal-organic frameworks (MOFs), including UMCM-1, MOF-205, MUF-7a, and the newly synthesized MOFs, termed ST-1, ST-2, ST-3, and ST-4 (ST = ShanghaiTech University), have been systematically investigated for ultrahigh capacity methane storage. Exceptionally, ST-2 was found to have the highest deliverable capacity of 289 cm3STP/cm3 (567 mg/g) at 298 K and 5-200 bar, which surpasses all previously reported records held by porous materials. We illustrate that the fine-tuned mesoporosity is critical in further improving the deliverable capacities at ultrahigh pressure.

Percutaneous first annular pulley release for trigger digits: a systematic review and meta-analysis of current evidence.

PURPOSE: To determine the overall success rate and potential influencing factors within the current evidence for percutaneous first annular pulley release. METHODS: We searched PubMed, EMBASE, and the Cochrane Library for all clinical studies of percutaneous release. The rates of successful procedure and complication were extracted and analyzed. We charted the overall success rate on a forest plot with 95% confidence intervals. Data of success rates were analyzed in 5- and 10-year intervals to determine whether the rate of success had increased chronologically. We then performed 3 subgroup analyses according to instrument type (needles vs knife blades), cortisone use (cortisone vs noncortisone), and sonography guidance (sonography vs non-sonography guidance). Pooled success rates were calculated in the subgroups and compared using chi-square test. RESULTS: A total of 34 studies involving 2,114 percutaneous procedures were included in this systematic review and meta-analysis. The total success rate was 94%. There was a trend toward increasing number of publications in the past 20 years. We found a statistically significant trend showing that overall success rates had increased over time. Chi-square test revealed that percutaneous release with sonography guidance had a significantly higher success rate than non-sonography guidance. There were no significant differences in other subgroup analyses including instrument type and cortisone use. CONCLUSIONS: Percutaneous release is an effective and safe procedure for the treatment of trigger digit. It has become progressively popular in recent years, with a trend toward increased overall success. Sonography might be a helpful tool for maximizing success. The success rates were not affected by instruments and cortisone use. TYPE OF STUDY/LEVEL OF EVIDENCE: Therapeutic IV.

Percutaneous release, open surgery, or corticosteroid injection, which is the best treatment method for trigger digits?

BACKGROUND: Percutaneous A1 pulley release surgery for trigger digit (finger or thumb) has gained popularity in recent decades. Although many studies have reported the failure rate and complications of percutaneous release for trigger digit, the best treatment for trigger digit remains unclear. QUESTIONS/PURPOSES: Our aim was to identify the relative risk of treatment failure, level of satisfaction, and frequency of complications, comparing percutaneous release with open surgery or corticosteroid injections for adult patients with trigger digits. METHODS: We searched PubMed, Embase, and the Cochrane Library for randomized controlled trials (RCTs), comparing percutaneous release with open surgery or corticosteroid injections. Seven RCTs involving 676 patients were identified. Methodologic quality was assessed by the Detsky quality scale. After data extraction, we compared results using a fixed meta-analysis model. RESULTS: There were no differences in the failure rate (risk ratio [RR] = 0.93; 95% CI, 0.14-6.25) and complication frequency (RR = 0.83; 95% CI, 0.15-4.72) between patients undergoing percutaneous release and open surgery. Patients treated with percutaneous release had fewer failures (RR = 0.07; 95% CI, 0.02-0.21) and a greater level of satisfaction (RR = 2.01; 95% CI, 1.62-2.48) compared with the patients treated with corticosteroid injections. We found no difference in complication frequency between percutaneous release and corticosteroid injection (RR = 3.19; 95% CI, 0.51-19.91). CONCLUSIONS: The frequencies of treatment failure and complications were no different between percutaneous release surgery and open surgery for trigger digit in adults. Patients treated with percutaneous releases were less likely to have treatment failure than patients treated with corticosteroid injections.