Abstract: ln this paper,the synthesis and characterization of several asymmetric porphyrin-like cadmium complexes and their electronic absorption spectral properties are reported.Studies on their absorption spectra show that these complexes exhibite a strong 0-0 transition band at near infrared region,the number of πelectrons and substituents on ρ-position of bezene ring can inflence this band remarkably.H-aggregation occured in strong polar solvents. The linear correlations of Hammett constants with the 0-0 transition energies,and the ratios of the oscillator strengh hare used to probe the conjugated interaction between π electron of macrocycles and metal ion of complexes with the substituents.

Key words: asymmetric pentaazadentate porphyrin-like cadmium complexes, electronic absorption spectra, aggregation, Hammett linear relationships