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Steady‐State and Time‐Resolved Photophysical Studies on a Series of Gallium Phthalocyanine Monomers and Dimers
Author(s) -
Chen Yu,
Araki Yasuyuki,
Hanack Michael,
Fujitsuka Mamoru,
Ito Osamu
Publication year - 2005
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200500340
Subject(s) - chemistry , intramolecular force , phthalocyanine , excited state , monomer , gallium , photochemistry , dimer , molecule , porphyrin , ground state , absorption spectroscopy , stereochemistry , atomic physics , polymer , organic chemistry , physics , quantum mechanics
Intramolecular interaction between coplanar‐stacked phthalocyanine (Pc) and porphyrin molecules plays an importantrole in the energy‐ and electron‐transfer process. A series of results from different photophysical experiments on gallium phthalocyanine compounds are initially described. The PcGa dimer with a direct gallium–gallium bond, i.e. [ t Bu 4 PcGa] 2 · 2dioxane, may exist in two different conformations: one in which the two phthalocyanines are poorly interacting and the other in which they are very close and strongly interacting. In the former, the emission lifetime is quite close to that of the monomer model compounds; in the latter, it is much shorter probably due to different radiative and nonradiative deactivation constants from those of the monomers. Because no significant difference between the absorption spectra of the monomer and dimer was observed in the photophysical experiments, implying that no ground‐state interaction can be assessed, the results regarding triplet excited state lifetimes of [ t Bu 4 PcGa] 2 · 2dioxane can be attributed to strong intramolecular interactions existing only in the excited state. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)