Synthese et Proprietes Redox des ?-Donneurs Mesogenes
- 1 November 1982
- journal article
- research article
- Published by Taylor & Francis in Molecular Crystals and Liquid Crystals
- Vol. 90 (1-2) , 153-162
- https://doi.org/10.1080/00268948208076178
Abstract
In the sequence of previous work on 2,2′,6.6′-titraaryl-4,4′-bipyrannylidbne and their sulfur analogs1,2 we report the synthesis (Scheme 1 and 2) and redox properties of heterocycles having long chain substituents. Introduction of four alkyl groups Cn H2n+1 in the para position of the phenyl groups leads to π-donors having mesomorphic (disco-like) properties (n > 9). In contrast, the presence of alkyloxy substituents leads only to mesomorphic species when the heteroatom is S but not O (n ≥ 12). All new donors give stable 1 :1 charge transfer complex with TCNQ, several of them having also mesomorphic properties.Keywords
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