Excited-state dynamics of 5,10,15,20-tetraphenyl-21H, 23H-porphine manganese(III) chloride encapsulated in TiMCM-41 and MCM-41; Proved by fs-diffuse reflectance laser photolysis

Yanghee Kim, Jun Rye Choi, Minjoong Yoon*, Akihiro Furube, Tsuyoshi Asahi, Hiroshi Masuhara

*Corresponding author for this work

Research output: Contribution to journalArticle

33 Scopus citations

Abstract

5,10,15,20-Tetraphenyl-21H,23H-porphine manganese(III) chloride (MnIIITPP(Cl)) was encapsulated into MCM-41 and TiMCM-41, and its photoinduced electron transfer had been studied by using femtosecond diffuse reflectance photolysis. Two different transient species (c.a. 10 ps and c.a. 80 ps) were observed. The shorter-lived species should be originated from relaxation of a "tripmultiplet" state and the longer-lived species should be attributed to the spin-forbidden relaxation (slower than the spin-allowed decay of triptquintet) via a quintet CT state. After irradiation, MnTPPCl+. radicals are detected in MCM-41 or TiMCM-41, indicating that the mesoporous silicate framework plays a good electron acceptor. Furthermore, it has been found that the formation MnTPPCl+. is easier in TiMCM-41 than in MCM-41, indicating that framework modification by incorporating the Ti4+ into the MCM-41 enhances the electron-accepting ability of the MCM-41 framework.

Original languageEnglish
Pages (from-to)8513-8518
Number of pages6
JournalJournal of Physical Chemistry B
Volume105
Issue number36
DOIs
StatePublished - 13 Sep 2001

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