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Reaction of porphyrin-based surface-anchored metal-organic frameworks to prolonged illumination

Adams, Michael; Baroni, Nicolo; Oldenburg, Michael; Kraffert, Felix; Behrends, Jan; MacQueen, Rowan W.; Haldar, Ritesh; Busko, Dmitry; Turshatov, Andrey; Emandi, Ganapathi; Senge, Mathias O.; Wöll, Christof; Lips, Klaus; Richards, Bryce S.; Howard, Ian A.

Abstract (englisch):
Crystalline surface-anchored metal–organic framework (SURMOF) thin films made from porphyrin-based organic linkers have recently been used in both photon upconversion and photovoltaic applications. While these studies showed promising results, the question of photostability in this organic–inorganic hybrid material has to be investigated before applications can be considered. Here, we combine steady-state photoluminescence, transient absorption, and time-resolved electron paramagnetic resonance spectroscopy to examine the effects of prolonged illumination on a palladium-porphyrin based SURMOF thin film. We find that phototreatment leads to a change in the material's photoresponse caused by the creation of stable products of photodecomposition – likely chlorin – inside the SURMOF structure. When the mobile triplet excitons encounter such a defect site, a short-lived (80 ns) cation–anion radical pair can be formed by electron transfer, wherein the charges are localized at a porphyrin and the photoproduct site, respectively.

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Postprint §
DOI: 10.5445/IR/1000087785
Veröffentlicht am 03.11.2019
DOI: 10.1039/C8CP05254A
Zitationen: 5
Web of Science
Zitationen: 5
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Funktionelle Grenzflächen (IFG)
Institut für Mikrostrukturtechnik (IMT)
Lichttechnisches Institut (LTI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2018
Sprache Englisch
Identifikator ISSN: 1463-9076, 1463-9084
KITopen-ID: 1000087785
HGF-Programm 43.22.01 (POF III, LK 01) Functionality by Design
Erschienen in Physical chemistry, chemical physics
Verlag Royal Society of Chemistry (RSC)
Band 46
Seiten 29142-29151
Vorab online veröffentlicht am 02.11.2018
Nachgewiesen in Scopus
Web of Science
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