Syntheses of Liquid Crystalline Phthalocyanines

Michael Hanack; Anton Beck; Helmut Lehmann

doi:10.1055/s-1987-28050

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Synthesis 1987; 1987(8): 703-705
DOI: 10.1055/s-1987-28050

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Syntheses of Liquid Crystalline Phthalocyanines

Michael Hanack^* , Anton Beck, Helmut Lehmann

^*Institut für Organische Chemie, Lehrstuhl für Organische Chemie II, Universität Tübingen, Auf der Morgenstelle 18, D-7400 Tübingen, West Germany

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Publication Date:
12 September 2002 (online)

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The syntheses of peripherally substituted metal phthalocyanines (C₈H₁₇OCH₂)₈PcM with M = Co, Ni and Pb are described. The macrocycle (C₈H₁₇OCH₂)₈PcCo is reacted with sodium cyanide under oxidative conditions to give the cyano-bridged compound [(C₈H₁₇OCH₂)₈PcCoCN]_n. All of the substituted metal phthalocyanines show liquid crystalline properties with phase transitions between 53.8°C and 94°C. Their liquid-crystal properties were demonstrated by DSC measurements and by polarization microscopy.