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1.
Chem Commun (Camb) ; 57(25): 3143-3146, 2021 Mar 28.
Artigo em Inglês | MEDLINE | ID: mdl-33634810

RESUMO

Three different thermo-responsive fluorescent thermometers were constructed by regulating the triplet energy level of organic ligands in isostructural Eu/Tb mixed MOFs. Among them, a quite unusual and rarely reported temperature-dependent fluorescence behavior was observed in LnBDC-NH2, and Eu0.01Tb0.99NDC is effective in the physiological range with the maximum relative sensitivity of 7.32% °C-1.


Assuntos
Európio/química , Limite de Detecção , Estruturas Metalorgânicas/química , Temperatura , Térbio/química , Termometria/instrumentação
2.
Dalton Trans ; 50(8): 2792-2799, 2021 Feb 28.
Artigo em Inglês | MEDLINE | ID: mdl-33533347

RESUMO

Urgent demand for the prevention and diagnosis of physiological diseases is driving the development of biomarkers and physiological temperature fluorometric sensors. In this paper, a rare trinuclear lanthanide metal-organic framework (MOF), [(CH3)2NH2][Eu3(µ3-OH)(2,6-NDC)3(HCOO)3]·(solv)x (Eu(2,6-NDC), where 2,6-H2NDC = 2,6-naphthalenedicarboxylic acid) was synthesized using reticular chemistry via reducing the symmetry of the organic ligand from axisymmetric 1,4-naphthalenedicarboxylic acid (1,4-H2NDC) to non-axisymmetric 2,6-H2NDC. Eu(2,6-NDC) shows exceptional chemical and thermal stability in acid-base solutions, PBS solution, and boiling water, and even under an air atmosphere up to 300 °C. As-synthesized Eu(2,6-NDC) exhibits ratiometric detection abilities for P1,P5-di(adenosine-5') pentaphosphate (Ap5A), for use as a biomarker of dry eye disease, with a limit of detection (LOD) of 0.031 µM, as well as excellent anti-interference properties. As far as is known, it is the first Ap5A sensor based on MOFs. In addition, the results show that the ratiometric parameters of co-doped Eu0.001Gd0.999(2,6-NDC) deliver a good linear luminescence response to physiological temperatures (20-60 °C) with high sensitivity.


Assuntos
Fosfatos de Dinucleosídeos/análise , Síndromes do Olho Seco/diagnóstico , Corantes Fluorescentes/química , Elementos da Série dos Lantanídeos/química , Estruturas Metalorgânicas/química , Temperatura , Biomarcadores/análise , Humanos , Espectrometria de Fluorescência
3.
ACS Appl Mater Interfaces ; 12(34): 38106-38112, 2020 Aug 26.
Artigo em Inglês | MEDLINE | ID: mdl-32799447

RESUMO

Platinum-based single-atom catalysts (SACs) are among the most promising candidates for the practical applications of electrochemical hydrogen evolution reaction (HER), but their catalytic efficiency remains to be further enhanced. Herein, a well-designed nanoarray-structured nitrogen-doped graphite foil (NNGF) substrate is introduced to support Pt SACs in Pt-N4 construction (Pt1/NNGF) for HER. Within NNGF, the constructed nanoarray-structured surficial layer for supporting Pt SACs could enhance the exposure of active sites to the electrolyte and improve the reaction and diffusion kinetics; meanwhile, the retained graphite structures in bulk NNGF provide not only the required electrical conductivity but also the mechanical stability and flexibility. Because of such double-layer structures of NNGF, stable Pt-N4 construction, and binder-free advantages, the Pt1/NNGF electrode exhibits a low overpotential of 0.023 V at 10 mA cm-2 and a small Tafel slope of 29.1 mV dec-1 as well as an excellent long-term durability.

4.
Chem Commun (Camb) ; 49(20): 2046-8, 2013 Mar 11.
Artigo em Inglês | MEDLINE | ID: mdl-23385347

RESUMO

The catalytic mechanism of doped complex hydrides for hydrogen storage remains unconfirmed. Here, we report a simple method to separate the active species of Ti-based catalysts in NaAlH(4) by filtration using tetrahydrofuran (THF) as solvent. The results show that the average particle size of the obtained Al-Ti active species is 30-50 nm.

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