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

34 Citations (Scopus)

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
Pages (from-to)709-717
Number of pages9
JournalJournal of Physical Chemistry A
Volume115
Issue number5
DOIs
Publication statusPublished - 2011 Feb 10

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Fullerenes
phenothiazines
Porphyrins
polarization (charge separation)
Aluminum
porphyrins
fullerenes
aluminum
Excited states
life (durability)
Photoexcitation
covalent bonds
photoexcitation
Ground state
excitation
phenothiazine
ground state
shift
electronics

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Sequential charge separation in two axially linked phenothiazine- aluminum(III) porphyrin-fullerene triads. / Poddutoori, Prashanth K.; Sandanayaka, Atula S D; Zarrabi, Niloofar; Hasobe, Taku; Ito, Osamu; Van Der Est, Art.

In: Journal of Physical Chemistry A, Vol. 115, No. 5, 10.02.2011, p. 709-717.

Research output: Contribution to journalArticle

Poddutoori, Prashanth K. ; Sandanayaka, Atula S D ; Zarrabi, Niloofar ; Hasobe, Taku ; Ito, Osamu ; Van Der Est, Art. / Sequential charge separation in two axially linked phenothiazine- aluminum(III) porphyrin-fullerene triads. In: Journal of Physical Chemistry A. 2011 ; Vol. 115, No. 5. pp. 709-717.
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