Subwavelength Spatially Resolved Coordination Chemistry of Metal-Organic Framework Glass Blends.


Type
Article
Change log
Authors
Kepaptsoglou, Demie M  ORCID logo  https://orcid.org/0000-0003-0499-0470
Longley, Louis 
Abstract

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 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.

Description
Keywords
0302 Inorganic Chemistry
Journal Title
J Am Chem Soc
Conference Name
Journal ISSN
0002-7863
1520-5126
Volume Title
140
Publisher
American Chemical Society (ACS)
Sponsorship
European Research Council (291522)
Royal Society (UF150021)
Henslow Research Fellowship, Girton College EPSRC studentship SuperSTEM, U.K. National Research Facility for Advanced Electron Microscopy, supported by the EPSRC