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| Titel: |
Salicylaldimine-based symmetric dimers: synthesis and thermal behaviour |
| Auteur: |
Yelamaggad, C. V. Nagamani, S. Anitha Hiremath, Uma S. Rao, D. S. Shankar Prasad, S. Krishna |
| Verschenen in: |
Liquid crystals |
| Paginering: | Jaargang 29 (2002) nr. 11 pagina's 1401-1408 |
| Jaar: |
2002-11-01 |
| Inhoud: |
Several symmetrical dimers comprised of salicylaldimine-moieties connected through ester linkages to the termini of odd-parity alkanediols have been synthesized and investigated for their thermal behaviour. In order to understand the structure-property relations, the lengths of the central alkylene spacers (C3 and C5) as well as those of the terminal alkoxy chains (C6 to C22) have been varied. The dimers with a C3-alkylene spacer are non-liquid crystalline, while some of the compounds having a C5-alkylene spacer exhibit liquid crystalline properties. The dimer, with a C5-alkylene spacer and C6-alkoxy tails, shows an intercalated smectic C (SmCc) phase, whereas the C8, C10, C11, and C12 homologues are non-mesomorphic. The higher homologues of this series with C16, C18, C20 and C22 alkoxy tails show a mesophase that has the signatures of a two-dimensional banana (B1) phase. This mesophase is enantiotropic in the C16 and C18 homologues while it is monotropic in the other homologues. In these dimers, the spacer length has a remarkable influence on the thermal behaviour. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 84 van 131 gevonden artikelen
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