Breaking aggregation in a tetrathiafulvalene-fused zinc porphyrin by metal-ligand coordination to form a donor-acceptor hybrid for ultrafast charge separation and charge stabilization

Atanu Jana, Habtom B. Gobeze, Masatoshi Ishida, Toshiyuki Mori, Katsuhiko Ariga, Jonathan P. Hill, Francis D'Souza

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

A novel electron rich, tetrathiafulvalene fused zinc porphyrin, (TTF)4PZn, has been newly synthesized and characterized using spectral and electrochemical methods. In spite of the presence of eight t-butyl groups, (TTF)4PZn exhibited appreciable aggregation in solution. Scanning electron microscopic (SEM) imaging of the aggregates revealed their spherical particulate morphology. Attenuation of intermolecular aggregation was possible by metal-ligand coordination of a nitrogenous ligand. Further, using this strategy, a donor-acceptor hybrid was formed by coordinating imidazole functionalized fullerene as an electron acceptor. The occurrence of intrasupramolecular ultrafast photoinduced charge separation has been established using fluorescence and transient absorption spectroscopic techniques. The determined rate of charge separation, kCS, and rate of charge recombination, kCR were found to be 1.4 × 1011 s-1 and 2.5 × 106 s-1, respectively. The lower kCR values indicate charge stabilization in the assembled donor-acceptor conjugate via an electron transfer-hole transfer mechanism.

Original languageEnglish
Pages (from-to)359-367
Number of pages9
JournalDalton Transactions
Volume44
Issue number1
DOIs
Publication statusPublished - Jan 7 2015

All Science Journal Classification (ASJC) codes

  • Inorganic Chemistry

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