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Discotic Liquid Crystals of Transition Metal Complexes 141: The Columnar Mesomorphism of the Branched-chainsubstituted Tetrakis(dithioacetato)-dinickel(II) Complex

Kazuchika Ohta, Yasue Morizumi, Hiroshi Ema, Tetsuya Fujimoto, Iwao Yamamoto

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Abstract

The n-alkyl derivative of tetrakis(n-pentyldithiolato)dinickel(II), 1a, has a monotropic discotic lamellar (DL) phase, whereas the branched-chain-substituted derivative of tetrakis(1-ethylpentyldithiol-ato)dinickel(II), 1b, has both an enantiotropic discotic hexagonal disordered columnar (Dhd) mesophase and a monotropic DL mesophase. Thus, we could change the mesomorphism from lamellar to columnar by changing the n-alkyl chain to the branched chain. This is a new branching effect, because this phenomenon has not been reported to date in the literature.

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What this paper is about

The n-alkyl derivative of tetrakis(n-pentyldithiolato)dinickel(II), 1a, has a monotropic discotic lamellar (DL) phase, whereas the branched-chain-substituted derivative of tetrakis(1-ethylpentyldithiol-ato)dinickel(II), 1b, has both an enantiotropic discotic hexagonal disordered columnar (Dhd) mesophase and a monotropic DL mesophase. Thus, we could change the mesomorphism from lamellar to columnar by changing the n-alkyl chain to the branched chain. This is a new branching effect, because this phenomenon has not been reported to date in the literature.

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Available abstract

The n-alkyl derivative of tetrakis(n-pentyldithiolato)dinickel(II), 1a, has a monotropic discotic lamellar (DL) phase, whereas the branched-chain-substituted derivative of tetrakis(1-ethylpentyldithiol-ato)dinickel(II), 1b, has both an enantiotropic discotic hexagonal disordered columnar (Dhd) mesophase and a monotropic DL mesophase. Thus, we could change the mesomorphism from lamellar to columnar by changing the n-alkyl chain to the branched chain. This is a new branching effect, because this phenomenon has not been reported to date in the literature.

Key concepts: Mesophase, Columnar phase, Discotic liquid crystal, Lamellar structure, Alkyl, Liquid crystal, Crystallography, Chemistry

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Discotic Liquid Crystals of Transition Metal Complexes 141: The Columnar Mesomorphism of the Branched-chainsubstituted Tetrakis(dithioacetato)-dinickel(II) Complex — Research Paper | ScholarLens