title: Relaxation Photoprocesses in a Crowned Styryl Dye and its Metal Complex.
abstract: The effects of solvent and crown-ether moiety on spectral properties of pyridinium styryl dye were studied by steady-state absorption and fluorescent spectroscopy. Analysis of viscosity and polarity effects on fluorescence quantum yield and Stokes shift permitted us to suggest that there is a two stage process of excited state relaxation. The macrocyclic moiety has a little influence on the first stage of relaxation, which manifests itself in a magnitude of Stokes shift, but suppresses considerably the second stage, which manifests itself in a magnitude of fluorescence quantum yield. The metal complex shows an additional stage of excited state relaxation, namely, photorecoordination of metal cation within the macrocyclic cavity.
authors.affiliation: Department of Chemistry, MV Lomonosov Moscow State University, Leninskie Gory 1, 119991, Moscow, Russian Federation. mvrusalov@yandex.ru.
authors.forename: Michael V
authors.initials: MV
authors.lastname: Rusalov
authors.affiliation: Department of Chemistry, MV Lomonosov Moscow State University, Leninskie Gory 1, 119991, Moscow, Russian Federation.
authors.forename: Boris M
authors.initials: BM
authors.lastname: Uzhinov
authors.affiliation: Universität Siegen, Physikalische Chemie, Adolf-Reichwein-Str. 2, 57076, Siegen, Germany.
authors.forename: Sergey I
authors.initials: SI
authors.lastname: Druzhinin
authors.affiliation: Department of Chemistry, MV Lomonosov Moscow State University, Leninskie Gory 1, 119991, Moscow, Russian Federation.
authors.forename: Vladimir L
authors.initials: VL
authors.lastname: Ivanov
authors.affiliation: Department of Chemistry, MV Lomonosov Moscow State University, Leninskie Gory 1, 119991, Moscow, Russian Federation.
authors.forename: Michael Ya
authors.initials: MY
authors.lastname: Melnikov
authors.affiliation: Photochemistry Center, Russian Academy of Sciences, Novatorov 7a, 119421, Moscow, Russian Federation.
authors.forename: Sergey P
authors.initials: SP
authors.lastname: Gromov
authors.affiliation: Photochemistry Center, Russian Academy of Sciences, Novatorov 7a, 119421, Moscow, Russian Federation.
authors.forename: Sergey K
authors.initials: SK
authors.lastname: Sazonov
authors.affiliation: Photochemistry Center, Russian Academy of Sciences, Novatorov 7a, 119421, Moscow, Russian Federation.
authors.forename: Michael V
authors.initials: MV
authors.lastname: Alfimov
keywords: Complex formation; Crown ether; Molecular rotor; Photorecoordination; Styryl dye