Abstract:

This paper presents the spectroscopic features of the aggregation of meso-tetrakis(p-sulfonatophenyl)porphine(TPPS4)induced by cetyltrimethylammoniumbromide(CTMAB)．Spectra studied involve absorption, fluorescence and Resonance light-scattering. The results show that J-type aggregates of TPPS4 can be produced with two TPPS4 molecules being stacked in the structure of staggering card-deck when the concentration of CTMAB is lower than 1.0×10-5mol•L-1．The J-type aggregates of TPPS4 still exist with a hypsochromic Soret band when the concentration of CTMAB is in the range 1.0×10-5~1.0×10-4mol•L-1．The J-type aggregates, however. disappear with the appearance of the D2h absorption features of free base porphyrin if the concentration of CTMAB is higher than 1.0×10-4mol•L-1Compared with the spectroscopic features of the free base porphyrin in water medium, the Soret band of the free base porphyrin in CTMAB medimn is red-shifted.

Key words: Cetyltrimethylammoniumbromid(CTMAB), meso-Tetrakis(p-sulfonatophenyl)porphine(TPPS4), Absorption spectrum, Fluorescence spectrum, Resonance lightscattering spectrum