Abstract
Two complexes of zinc phthalocyanine monoaxially ligated by 3,4-dimethylpyridine (1) and 4-ethylpyridine (2) were obtained in crystalline forms. Compound 1 depending on the crystallisation condition crystallises in two crystalline modifications, i.e. monoclinic (P21/c, 1m) and orthorhombic (Pccn, 1o), whereas compound 2 crystallises only in one orthorhombic form (Pccn space system). Structures 1o and 2 are isotypic; an explanation of that behaviour was proposed. Each structure contains the zinc phthalocyanine and the ligand molecules in molar ratio 1:1, which was confirmed by X-ray single diffraction and thermogravimetric analysis. Ligation of the ZnPc by N-ring aromatic ligands with formation of complexes 1 and 2 does not change the colouring properties, but increases their solubility in the organic solvents comparing to the parent ZnPc pigment.
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