Sequential charge separation in two axially linked phenothiazine- aluminum(III) porphyrin-fullerene triads

Prashanth K. Poddutoori, Atula S.D. Sandanayaka, Niloofar Zarrabi, Taku Hasobe, Osamu Ito, Art Van Der Est

Research output: Contribution to journalArticle

36 Scopus citations

Abstract

New supramolecular triads (PTZpy→AlPor - C60, TPTZpy→AlPor - C60), containing aluminum(III) porphyrin (AlPor), fullerene (C60), and phenothiazine (phenothiazine = PTZ, 2-methylthiophenothaizine = TPTZ) have been constructed. In these triads the fullerene and phenothiazine units are bound axially to opposite faces of the porphyrin plane via covalent and coordination bonds, respectively. The ground-and excited-state properties of the triads and reference dyads are studied using steady-state and time-resolved spectroscopic techniques. The time-resolved data show that photoexcitation results in charge separation from the excited singlet state of the porphyrin to the C60 unit, generating (Donor)py→AlPor•+ - C60 •-, Donor = PTZ and TPTZ. A subsequent hole shift from the porphyrin to phenothiazine generates the charge-separated state (Donor) •+ py→AlPor - C60•-. The lifetime of the charge separation exhibits a modest increase from 39 ns in the absence of the donor to 100 ns in PTZpy→AlPor - C60 and 83 ns in TPTZpy→AlPor - C60. These lifetimes are discussed in terms of the electronic coupling between phenothiazine, the porphyrin, and C 60.

Original languageEnglish (US)
Pages (from-to)709-717
Number of pages9
JournalJournal of Physical Chemistry A
Volume115
Issue number5
DOIs
StatePublished - Feb 10 2011

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