Phthalocyanines with rigid carboxylic acid containing pendant arms

Abstract

Abstract Metal-free and metallophthalocyanines (Zn, Co) substituted with four carboxybiphenyloxy groups on the peripheral positions were prepared from 4-(4′-carboxybiphenyloxy)phthalonitrile. Esterification of all of the biphenylcarboxylic acid groups of metal-free phthalocyanine with hexanol afforded 2,9,16,23-tetrakis(4′-carbhexyloxybiphenyloxy) phthalocyanine. These new compounds have been characterised by 1 H NMR, 13 C NMR, FT-IR, UV–Vis and mass spectroscopies.