Subwavelength Spatially Resolved Coordination Chemistry of Metal-Organic Framework Glass Blends.
Journal of the American Chemical Society
American Chemical Society (ACS)
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Collins, S., Kepaptsoglou, D. M., Butler, K. T., Longley, L., Bennett, T., Ramasse, Q. M., & Midgley, P. (2018). Subwavelength Spatially Resolved Coordination Chemistry of Metal-Organic Framework Glass Blends.. Journal of the American Chemical Society, 140 (51), 17862-17866. https://doi.org/10.1021/jacs.8b11548
Microstructured metal-organic framework (MOF) glasses have been produced by combining two amorphous MOFs. However, the electronic structure of these materials has not been interrogated at the length scales of the chemical domains formed in these glasses. Here, we report a subwavelength spatially resolved physicochemical analysis of the electronic states at visible and UV energies in a blend of two zeolitic imidazolate frameworks (ZIFs), ZIF-4-Co and ZIF-62-Zn. By combining spectroscopy at visible and UV energies as well as at core ionization energies in electron energy loss spectroscopy in the scanning transmission electron microscope (STEM-EELS) with density functional theory calculations, we show that domains less than 200 nm in size retain the electronic structure of the precursor crystalline ZIF phases. Prototypical signatures of coordination chemistry including d-d transitions in ZIF-4-Co are assigned and mapped with nanoscale precision.
Henslow Research Fellowship, Girton College EPSRC studentship SuperSTEM, U.K. National Research Facility for Advanced Electron Microscopy, supported by the EPSRC
Royal Society (UF150021)
European Research Council (291522)
External DOI: https://doi.org/10.1021/jacs.8b11548
This record's URL: https://www.repository.cam.ac.uk/handle/1810/287487