KIT | KIT-Bibliothek | Impressum | Datenschutz

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.

Open Access Logo


Postprint §
DOI: 10.5445/IR/1000087785
Frei zugänglich ab 03.11.2019
Originalveröffentlichung
DOI: 10.1039/C8CP05254A
Scopus
Zitationen: 1
Web of Science
Zitationen: 1
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Lichttechnisches Institut (LTI)
Institut für Funktionelle Grenzflächen (IFG)
Publikationstyp Zeitschriftenaufsatz
Jahr 2018
Sprache Englisch
Identifikator ISSN: 1463-9076, 1463-9084
urn:nbn:de:swb:90-877853
KITopen-ID: 1000087785
HGF-Programm 43.22.01 (POF III, LK 01)
Erschienen in Physical chemistry, chemical physics
Band 46
Seiten 29142-29151
Vorab online veröffentlicht am 02.11.2018
Nachgewiesen in Web of Science
Scopus
Relationen in KITopen
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
KITopen Landing Page