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Proximity Effect in Crystalline Framework Materials: Stacking‐Induced Functionality in MOFs and COFs [in press]

Kuc, Agnieszka; Springer, Maximilian A.; Batra, Kamal; Juarez‐Mosqueda, Rosalba; Wöll, Christof; Heine, Thomas

Abstract:
Metal–organic frameworks (MOFs) and covalent organic frameworks (COFs) consist of molecular building blocks being stitched together by strong bonds. They are well known for their porosity, large surface area, and related properties. The electronic properties of most MOFs and COFs are the superposition of those of their constituting building blocks. If crystalline, however, solid‐state phenomena can be observed, such as electrical conductivity, substantial dispersion of electronic bands, broadened absorption bands, formation of excimer states, mobile charge carriers, and indirect band gaps. These effects emerge often by the proximity effect caused by van der Waals interactions between stacked aromatic building blocks. Herein, it is shown how functionality is imposed by this proximity effect, that is, by stacking aromatic molecules in such a way that extraordinary properties emerge in MOFs and COFs. After discussing the proximity effect in graphene‐related materials, its importance for layered COFs and MOFs is shown. For MOFs with well‐defined structure, the stacks of aromatic building blocks can be controlled via varying MOF topology, lattice constant, and by attaching steric control units. ... mehr

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Zugehörige Institution(en) am KIT Institut für Funktionelle Grenzflächen (IFG)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 1616-301X, 1616-3028
KITopen-ID: 1000105891
Erschienen in Advanced functional materials
Vorab online veröffentlicht am 06.02.2020
Nachgewiesen in Scopus
Web of Science
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