Synthesis and fluorescence study of a (2-naphthoxy)polyoxalkoxy antimony(V) tetraphenylporphyrin complex

The fluorescence spectra of (2-naphthoxy)polyoxalkoxy antimony (V) tetraphenylporphyrin complex (1a-d) were analyzed under the excitation of naphthoxy and porphyrin chromophores. The excitation energy of naphthoxy chromophore was transferred to the porphyrin moiety at the rate constants of 6.7-8.3 x 10(8) s(-1). The rate constants of energy transfer were nearly constant irrespective of the length of the methylene bridge. The emission of porphyrin chromophore was quenched by naphthoxy chromophore at rate constants of 10(7)-10(10) s(-1) depending on both the solvent used and the length of the methylene bridge. Under the excitation of the naphthoxy chromophore of the triad system (1d) involving porphyrin, 2-naphthoxy, and 4-methoxyphenoxy chromophores, the excited singlet state of the porphyrin chromophore generated by the energy transfer from the naphthoxy chromophore was quenched by the naphthoxy and the methoxyphenoxy chromophores via non-radiative processes involving electron transfer. (C) 2002 Elsevier Science B.V. All rights reserved.