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Laser Flash Photolysis of Phthalocyanines in Solution and Microemulsion
Author(s) -
Jacques Patrice,
Braun André M.
Publication year - 1981
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19810640610
Subject(s) - chemistry , microemulsion , flash photolysis , phthalocyanine , laser , excitation , saturation (graph theory) , photochemistry , homogeneous , triplet state , intensity (physics) , analytical chemistry (journal) , chemical physics , optics , thermodynamics , reaction rate constant , organic chemistry , molecule , kinetics , pulmonary surfactant , electrical engineering , quantum mechanics , combinatorics , engineering , biochemistry , physics , mathematics
Triplet state formation (Φ isc ) and properties (ε T‐T , τ T ) of phthalocyanine (HPC) and zinc phthalocyanine (ZnPC) have been characterized in homogeneous solutions (1‐chloronaphthalene, 1‐propanol) and in microemulsion by investigating the variation of the transient optical density as a function of the intensity of the exciting laser. Experimental results follow the theoretically predicted dependence only for very low intensities of the exciting pulse. At higher intensities, a more complicated scheme of primary reactions has to be taken into account, implicating qualitative restrictions in the application of saturation experiments. The observed transients at high‐intensity excitation are interpreted as being perturbed by aggregational phenomena.