- Synthesis and Redox Properties of Mesogene pi -Donors.
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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.
- Gionis,Fugnitto,Meyer,Strzelecka,Dubois
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- A Discotic Mesophase with Binary or Tetragonal Symmetry
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The 2,2',6,6'-tetra-arylpipyran-4-ylidenes (1b) and (1c), disk-like molecules with a novel core and four n-alkyl side chains, exhibit a discotic mesophase which allows either four- or two-fold symmetry.
- Fugnitto, Rose,Strzelecka, Helena,Zann, Annie,Dubois, Jean-Claude,Billard, Jean
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p. 271 - 272
(2007/10/02)
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