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Photoinduced electron transfer in supramolecular complexes of a π-extended viologen with porphyrin monomer and dimer

Title
Photoinduced electron transfer in supramolecular complexes of a π-extended viologen with porphyrin monomer and dimer
Authors
Fukuzumi S.Amasaki I.Ohkubo K.Gros C.P.Guilard R.Barbe J.-M.
Ewha Authors
Shunichi Fukuzumi
SCOPUS Author ID
Shunichi Fukuzumiscopus
Issue Date
2012
Journal Title
RSC Advances
ISSN
2046-2069JCR Link
Citation
vol. 2, no. 9, pp. 3741 - 3747
Indexed
SCIE; SCOPUS WOS scopus
Abstract
A π-extended viologen has been synthesized, forming supramolecular complexes with a freebase tetraphenylporphyrin (H 2TPP) and the cofacial porphyrin dimer with an anthracene spacer [H 4(DPA)] through π-π interaction in benzonitrile (PhCN). Formation of the H 2TPP-BHV 2+ supramolecular complex was probed by UV-vis and fluorescence spectra. The fluorescence of H 2TPP was strongly quenched by electron transfer from the singlet excited state ( 1H 2TPP *) to BHV 2+ in the supramolecular complex. The transient absorption spectrum of the charge-separated (CS) state (H 2TPP •+ and BHV •+) was successfully detected by the laser flash photolysis measurements of the H 2TPP- BHV 2+ supramolecular complex in PhCN. The lifetime of the CS state of the supramolecular complex was determined as 0.37 ms in PhCN at 298 K. The H 4(DPA)-BHV 2+ supramolecular complex was formed with a larger formation constant as compared to the H 2TPP-BHV 2+ supramolecular complex because of the stronger π-π interaction of BHV 2+ with the cofacial porphyrin dimer and the lifetime of the CS state was determined to be 0.59 ms in PhCN at 298 K. © 2012 The Royal Society of Chemistry.
DOI
10.1039/c2ra20130e
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자연과학대학 > 화학·나노과학전공 > Journal papers
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