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Lookup NU author(s): Patrycja Stachelek, Dr Mohammed Alamiry, Emeritus Professor Anthony Harriman
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The photophysical properties of a prototypic donor-acceptor dyad, featuring a conventional boron dipyrromethene (Bodipy) dye linked to a dicyanovinyl unit through a meso-phenylene ring, have been recorded in weakly polar solvents. The absorption spectrum remains unperturbed relative to that of the parent Bodipy dye but the fluorescence is extensively quenched. At room temperature, the emission spectrum comprises roughly equal contributions from the regular pi,pi* excited-singlet state and from an exciplex formed by partial charge transfer from Bodipy to the dicyanovinyl residue. This mixture moves progressively in favor of the locally excited pi,pi* state on cooling and the exciplex is no longer seen in frozen media; the overall emission quantum yield changes dramatically near the freezing point of the solvent. The exciplex, which has a life-time of approximately 1 ns at room temperature, can also be seen by transient absorption spectroscopy, in which it decays to form the locally excited triplet state. Under applied pressure (P<170 MPa), formation of the exciplex is somewhat hindered by restricted rotation around the semirigid linkage and again the emission profile shifts in favor of the p, p* excited state. At higher pressure (170
Author(s): Nano A, Ziessel R, Stachelek P, Alamiry MAH, Harriman A
Publication type: Article
Publication status: Published
Journal: ChemPhysChem
Year: 2014
Volume: 15
Issue: 1
Pages: 177-186
Print publication date: 20/12/2013
ISSN (print): 1439-4235
ISSN (electronic): 1439-7641
Publisher: Wiley - VCH Verlag GmbH & Co. KGaA
URL: http://dx.doi.org/10.1002/cphc.201300805
DOI: 10.1002/cphc.201300805
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