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Issue 4, 2014
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Excited-state dynamics of thiophene substituted betaine pyridinium compounds

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Abstract

This work deals with the photophysics of novel pyridinium betaine based on 2-pyridin-1-yl-1H-benzimidazole (SBPa) substituted symmetrically by mono- (Th2SBPa) and bi-thiophene fragments (Th4SBPa). The study is based on a combination of steady-state, femtosecond transient absorption spectroscopic measurements supported by PCM–(TD)DFT calculations. It is found that the two step ICT process (S0 → S2 excitation followed by S2(CT) → S1(CT) internal conversion) occurring for the parent molecule remains unaffected for Th2SBPa while the situation is less clear for Th4SBPa. Actually, for both molecules, a new decay route involving the π-electron system localized in thiophenic groups is responsible for the production of triplet states. Involvement of this new route in the parallel production of S1(CT) is strongly suspected.

Graphical abstract: Excited-state dynamics of thiophene substituted betaine pyridinium compounds

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Publication details

The article was received on 29 Aug 2013, accepted on 06 Nov 2013 and first published on 08 Nov 2013


Article type: Paper
DOI: 10.1039/C3CP53614A
Phys. Chem. Chem. Phys., 2014,16, 1460-1468

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    Excited-state dynamics of thiophene substituted betaine pyridinium compounds

    S. Aloïse, Z. Pawlowska, O. Poizat, G. Buntinx, A. Perrier, F. Maurel, K. Ohkawa, A. Kimoto and J. Abe, Phys. Chem. Chem. Phys., 2014, 16, 1460
    DOI: 10.1039/C3CP53614A

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