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The synthesis, phase transitions and optical properties of novel tetrathiafulvalene derivatives with extremely high molecular polarizabilities

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JournalLIQUID CRYSTALS
DatePublished - Jul 2001
Issue number7
Volume28
Number of pages9
Pages (from-to)1047-1055
Original languageEnglish

Abstract

The synthesis of novel unsymmetrically-substituted tetrathiafulvalene derivatives based on lithiation procedures is described. The disubstituted derivatives were synthesized as 1:1 cis/trans-isomeric mixtures, the compositions of which were established by H-1 NMR and C-13 NMR spectroscopy. The transition temperatures, refractive indices, birefringence, polarizability and order parameter of each of the mixtures were determined and the values are discussed in comparison with analogous compounds with the tetrathiafulvalene unit replaced by a 1,4-phenylene group. In addition, we describe the synthesis of a number of monosubstituted tetrathiafulvalene derivatives and their associated thermal properties. The isomeric compounds presented in this paper have exceptionally large values of polarizability anisotropy, as compared with their phenyl-containing counterparts.

    Research areas

  • ORDER PARAMETERS, LIQUID-CRYSTALS, SUBSTITUENTS, ANISOTROPIES

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