Molecular Crystals and Liquid Crystals (1969-1991) p. 153 - 162 (1982)
Update date:2022-08-15
Topics:
Gionis
Fugnitto
Meyer
Strzelecka
Dubois
In the sequence of previous work on 2,2 prime ,6,6 prime -tetraaryl-4,4 prime -bipyrannylidene and their sulfur analogs, the authors report the synthesis (Scheme 1 and 2) and redox properties of heterocycles having long chain substituents. Introduction of four alkyl groups C//nH//2//n// plus //1 in the para position of the phenyl groups leads to pi -donors having mesomorphic (disco-like) properties (n greater than 9). In contrast, the presence of alkyloxy substituents leads only to mesomorphic species when the heteroatom is S but not O (n greater than equivalent to 12). All new donors give stable 1:1 charge transfer complex with TCNQ, several of them having also mesomorphic properties.
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