Extended conjugated mesogens: synthesis and mesomorphic properties of H-shaped mesogens based on 3,3ʹ,5,5ʹ-tetrasubstituted 2,2ʹ-bithiophene with oligo(1,4-phenyleneethynylene) arms
Abstract:A new class of extended conjugated mesogens, namely H-shaped mesogens based on 3,3ʹ,5,5ʹ-tetrasubstituted 2,2ʹ-bithiophene with oligo(1,4-phenyleneethynylene) arms, have been synthesised, and the relationships between molecular structures and mesomorphic properties investigated. Tetraalkyl, tetraalkoxy and dialkyldialkoxy derivatives, [R 1 C 6 H 4 CCC 6 H 2 (C 2 H 5 ) 2 CC] 2 [R 2 C 6 H 4 CCC 6 H 2 (C 2 H 5 ) 2 CC] 2 C 8 H 2 S 2 where R 1 and R 2 = alkyl and alkoxy chains of different lengths, exhibit nematic … Show more
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