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- aggregation classification "A1".
- aggregation creator B444420.
- aggregation creator B444421.
- aggregation creator person.
- aggregation date "1999".
- aggregation format "application/pdf".
- aggregation hasFormat 1190450.bibtex.
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- aggregation hasFormat 1190450.didl.
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- aggregation hasFormat 1190450.yaml.
- aggregation isPartOf urn:issn:0923-0750.
- aggregation language "eng".
- aggregation rights "I have transferred the copyright for this publication to the publisher".
- aggregation subject "Chemistry".
- aggregation title "Ionic liquid crystals with hemicyanine chromophores".
- aggregation abstract "(E)-N-alkyl-4-(2-(4-dimethylaminophenyl)ethenyl) pyridinium bromides (hemicyanine bromides) with C-14, C-16 and C-18 straight alkyl chains are described. The thermal behaviour of these compounds was investigated by differential scanning calorimetry (DSC) and by optical microscopy. The textures observed in polarised light revealed that these compounds exhibit a smectic A mesophase. A focal-conic fan texture was observed, together with regions showing homeotropic alignment. The phase behaviour of the compound with the C(1)6 chain can be summarized as: Cr-1. 99 . Cr-2. 249 . SmA . 268 . I (dec.). The transition temperatures are rather independent of the length of the alkyl chain. The compounds have a strong tendency to supercool to a glassy mesophase. A structural model for the mesophase is proposed. The bromide anion of the hemicyanine bromides can be replaced by the bulky tetrakis(beta-diketonato)lanthanide(III) anion. As the beta-diketone, 2,4-pentanedione (acetylacetone, acac) and 1,3-diphenyl-1,3-propanedione (dibenzoylmethane, DBM) are chosen. None of the lanthanide complexes containing the hemicyanine chromophore shows a mesophase. The complexes either melt directly to an isotropic liquid, or decompose without melting.".
- aggregation authorList BK775749.
- aggregation endPage "73".
- aggregation issue "1-2".
- aggregation startPage "63".
- aggregation volume "35".
- aggregation aggregates 1192085.
- aggregation isDescribedBy 1190450.
- aggregation similarTo A:1008146431142.
- aggregation similarTo LU-1190450.