Synthesis and Characterization of Crown-Ether-Containing Phthalocyanines with Group-IV-A Elements |
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Authors: | Vefa Ahsen Emel Yilmazer Ayegül Gürek Ahmet Gül
zer Bekrolu |
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Institution: | Vefa Ahsen,Emel Yilmazer,Ayşegül Gürek,Ahmet Gül,Özer Bekâroǧlu |
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Abstract: | Group-IV-A phthalocyanines with four crown ether substituents have been prepared from 4′,5′-dicyanobenzo(15-crown-5), 4′,5′-diiminoisoindolino(15-crown-5), or metal-free phthalocyanine and the corresponding metal salts. The axial ligands of dichlorotetra(15-crown-5)phthalocyaninato]silicon or -tin have been converted into dihydroxy derivatives by hydrolysis in aqueous Et3N. The catalytic effect of H2O-free CaC12 in quinoline is used for the polycondensation of dihydroxysilicon-phthalocyanine to cofacially arrayed polymers. The thermal stability of group-IV-A-metal phthalocyanines is confirmed by the higher initial decomposition points (290–440°) compared to those of the corresponding transition-metal phthalocyanines. |
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