The crystal structure of the β-polymorph of copper phthalocyanine has been determined from three-dimensional X-ray diffraction data. A total of 1691 structure amplitudes was used in the refinement which resulted in R= 7·3% and standard deviation of bond lengths of 0·005 Å. The structure is isomorphous with those of the metal-free1 and nickel2 phthalocyanines.
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Carolyn J. Brown (1968) studied this question.