In order to study the aggregation behavior of phthalocyanines with different phenoxy-substituents, five tetraphenoxyphthalocyaninatopalli dium with different phenoxy substituents (e.g. 2, 4- dichlorophenoxy, Pel; phenoxy, Pc2; 2, 4-dibutylphenoxy, Pc3; 2, 5- dibutylphenoxy, Pc4; 2,6-dibromo-4-methylphenoxy, Pc5) were synthesized. The aggregation degree is dependent on the properties of the phenoxy-substituents. The dimerization constants of Pel ~ 5 in THF with concentration of 10~(-6) ～ 10~(-5) mol·L~(-1) were obtained by calculation, giving 1.61 * 10~5 mol~(-1)·dm~3, 3.87 * 10~5 mol~(-1) ·dm~3, 2.60 * 10~5 mol~(-1)·dm~3, 1.21 * 10~5 mol~(-1)·dm~3 and 2.57 * 10~5 mol~(-1)·dm~3, respectively. There are similar absorption spectra of the monomer and the corresponding dimmer for all the compounds except Pel. The effect of substituents on the absorption spectra of the thin solid film is diversity with respect to the different substituents. By comparing the absorption spectra in the solution with those in the solid film, large differences can be observed in which spectrum shape is mostly changed for Pcl and λ_(max) was mostly shifted for Pc5.

Key words: PHTHALOCYANINE, AGGREGALES, ABSORPTION SPECTROMETRY, TETRAHYDROFURAN