Exciton Coupling and Conformational Changes Impacting the Excited State Properties of Metal Organic Frameworks

Andreas Windischbacher, Luca Steiner, Ritesh Haldar, Christof Wöll, Egbert Zojer*, Anne-Marie Kelterer*

*Korrespondierende/r Autor/in für diese Arbeit

Publikation: Beitrag in einer FachzeitschriftArtikel

Abstract

In recent years, the photophysical properties of crystalline metal-organic frameworks (MOFs) have become increasingly relevant for their potential application in light-emitting devices, photovoltaics, nonlinear optics and sensing. The availability of high-quality experimental data for such systems makes them ideally suited for a validation of quantum mechanical simulations, aiming at an in-depth atomistic understanding of photophysical phenomena. Here we present a computational DFT study of the absorption and emission characteristics of a Zn-based surface-anchored metal-organic framework (Zn-SURMOF-2) containing anthracenedibenzoic acid (ADB) as linker. Combining band-structure and cluster-based simulations on ADB chromophores in various conformations and aggregation states, we are able to provide a detailed explanation of the experimentally observed photophysical properties of Zn-ADB SURMOF-2: The unexpected (weak) red-shift of the absorption maxima upon incorporating ADB chromophores into SURMOF-2 can be explained by a combination of excitonic coupling effects with conformational changes of the chromophores already in their ground state. As far as the unusually large red-shift of the emission of Zn-ADB SURMOF-2 is concerned, based on our simulations, we attribute it to a modification of the exciton coupling compared to conventional H-aggregates, which results from a relative slip of the centers of neighboring chromophores upon incorporation in Zn-ADB SURMOF-2.

Originalspracheenglisch
Aufsatznummer4230
Seitenumfang21
FachzeitschriftMolecules
Jahrgang25
Ausgabenummer18
DOIs
PublikationsstatusVeröffentlicht - 15 Sep 2020

ASJC Scopus subject areas

  • !!Drug Discovery
  • Analytische Chemie
  • !!Chemistry (miscellaneous)
  • !!Molecular Medicine
  • !!Physical and Theoretical Chemistry
  • !!Pharmaceutical Science
  • Organische Chemie

Fields of Expertise

  • Advanced Materials Science

Treatment code (Nähere Zuordnung)

  • Basic - Fundamental (Grundlagenforschung)

Fingerprint

Untersuchen Sie die Forschungsthemen von „Exciton Coupling and Conformational Changes Impacting the Excited State Properties of Metal Organic Frameworks“. Zusammen bilden sie einen einzigartigen Fingerprint.

Dieses zitieren