Formtion and Characterization of Aggregates of Merocyanine Dyes in Vacuum-Deposited Thin Film : Surfaces, Interfaces, and Films

概要

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Thin films of merocyanine (MD) dyes substituted with alkyl chains of various lengths at the benzothiazol ring are prepared by vacuum evaporation. The structure and aggregate formation upon dimethylamine vapor treatment are discussed based on the kind of substituent at the rhodanine ring, crystallinity and alkyl chain length. It is found that the introduction of a carboxymethyl group at the rhodanine ring and the fabrication of amorphous films are very important in aggregate formation. MD-2, -5 and -6 films, which the number sindicate the number of carbon atoms in the alkyl chain, form H-aggregates, and MD-10 and amorphous MD-18 form J-aggregates. The difference ih aggregate structure according to the alkyl chain length positioned at the benzothiazol ring depends on the degree of steric hindrance between alkyl chains. The activation energies of H-and J-aggregate formation are estimated to be 4.46kJ mol^<-1> and 11.07kJ mol^<-1>, respectively.
社団法人応用物理学会の論文
2001-12-15