The Whole is Better Than The Sum of Its Parts: Hexiang Deng’s recent research published on JACS

One of the big potentials in the MOF field is that the extend framework can hold multiple functional groups (eg. mechanic moieties) closely to each other so that they can operate either in parallel or even in sequence. Such multi-variate MOFs (MTV-MOFs) have identical structure to the original MOF crystallgraphically, thus the spatial arrangement of multiple components in MTV-MOFs are extremely hard to decipher. In the past two years, a research team in Wuhan University lead by Hexiang Deng synthesized a series of thirty-six porphyrin based MOFs with various metals. They creatively applied X-ray photoelectron spectroscopy (XPS), ultraviolet-visible diffuse reflectance spectra (UV-vis DRS) to reveal the subtle difference in the chemical environment of these metals. Through detailed analysis, the researchers deciphered, for the first time, the metal spatial arrangement found that the metals exist in the form of either domains or well-mixed arrangement. They also revealed that those MTV-MOFs with well-mixed metals rather metals forming domains, perform significantly better in photocataytic reaction. This general method provides new ways to rationalize the synthesis and characterization of MTV-MOF and published onJournal of the American Chemical Society(JACS) with the title“Deciphering theSpatial Arrangement of Metals and Correlation to Reactivity in Multivariate Metal-Organic Frameworks” (DOI: 10.1021/jacs.6b08724). Qi Liu and Hengjiang Cong are the main contributing authors for this research. This research is supported by the 1000 Talent Plan of China, National Natural Science Foundation of China (21471118) and National Key Basic Research Program of China (2014CB239203). X-ray Adsorption Fine-Structure (XAFS) spectra were collected at beamlines BL14W and BL15U, and Microcrystal X-ray Diffraction experiments were performed at beamline BL17U1 of Shanghai Synchrotron Radiation Facility (SSRF).




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