Polymeric phthalocyanines and their precursors, 16. A structure model for polymeric phthalocyanines

A model for describing the structural features such as degree of polymerization, size, and shape of polymeric phthalocyanines 2, 4, 6 is described. Analytical methods such as IR, titration of carboxylic end groups, and elemental analysis are used in the structure investigation. The results demonstrate that for polymeric phthalocyanines 2 with cyano end groups, prepared from 1,2,4,5‐benzenetetracarbonitrile (1), the number of macrocycles (n) in the polymer is not higher than 7–9, and that linear polymers as well as polymers with two rows are possible. Polymers 6, prepared from bridged diphthalonitriles 5, are considerably larger showing a more two‐dimensional structure. For polymeric phthalocyanines 4 with carboxylic end groups, prepared from 1,2,4,5‐benzenetetracarboxylic acid derivatives 3, a linear structure with n = 4–9 is favoured. Literature results are examined in the light of the described model.