Aim To study the effects of the concentrations of 5,10,15 tri( p hydrox ylphenyl) 20 ( p hexadecyloxyphenyl) porphyrin(a synthesis amphiphilic porphy rin), as well as solvent polarity on the aggregation forms of this porphyrin. Methods The information of interaction between the phorphyrins was obtained by the shifts and FWHHs of the Soret band according to UV vis spectra of the amphiphilic porphyrin in aqueous, chloroform and cyclohexane solutions at various concentrations. Results ...