Alkali Metal Picrate Complexes of “Crowned”‐Phthalocyanines. Solid State Structures and Electrical Properties

Molecules of copper phthalocyanine substituted with four 18‐crown‐6 moieties, were aggregated with the help of K + , Rb + , and Cs + picrates. Possible structures were proposed based on computer analysis of X‐ray powder diffraction patterns: for the crowned phthalocyanine an orthorhombic cell with: a = 50.77, b = 25, c = 8.7 Å. For its metal picrate complexes, tetragonal structures were found: a = b = 22.76, c = 12.99 Å (K + ‐complex); a = b = 29.44, c = 10.63 Å (Cs + ‐complex); a = b = 29.44, c = 10.40 Å (Rb + ‐complex). A.c. impedance spectroscopy showed an increase in the electronic conductivity of 2 to 3 powers of ten, if crowned phthalocyanine was aggregated by means of a metal picrate salt. In the K + complex only electronic conductivity could be detected. The Rb + and Cs + complexes exhibited cation conductivity as well.