Complexation and crystallization of anionic phthalocyanine with soluble and cross-linked polycations

The complexation and crystallization of the tetrasodium salt of copper tetr asulfophthalocyanine (CuTSPc) with the solvated polycations poly((acryloylo xy)ethylpyridinium bromide) (PC2py) and poly((acryloyloxy)dodecylpyridinium bromide) (PC12py) and their gels were studied. CuTSPc binds to PC2py coope ratively and stoichiometrically, while it binds to PC12py in a cooperative but nonstoichiometric way. The wide-angle X-ray diffraction (WAXD) pattern of the CuTSPc-PC12py complex showed high crystallinity, in which the CuTSPc molecules formed hexagonal columns. On the other hand, diffraction peaks w ere weaker in the WAXD pattern of the CuTSPc-PC2py complex. The longer side chain of the polycations gives the bound CuTSPc molecules sufficient mobil ity and space to form better organized crystals. The complex of the CuTSPc- PC12py gel also crystallized despite the low mobility of the side chain sin ce the main chain is restrained by cross-linkages.