Mesomorphic molecular materials. Influence of chain length on the structural properties of octa-alkyl substituted phthalocyanines

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Abstract
Phthalocyanines R, PcM (R = alkyl, M = H, Ni, Cu) substituted with alkyl chains have been synthesized and their liquid crystalline properties studied by differential scanning calorimetry and X-ray diffraction at small angles. The influence of the chain length on the mesomorphic properties has been determined. A model is proposed to rationalize the structural modifications induced by varying the nature of the connecting link between the macrocycle and the side chains (alkyl, alkoxymethyl, alkoxy).