A strong dependence of the rotational dynamics of the mesogenic units ( brelaxation) on the order of the mesophase was found in sidechain liquid crystal polymers. The preexponential frequency factor, f \* bϱ , and the activation energy, E\* ab , of the b-relaxation rate both increase significantly (
Synthesis and Characterization of Unsymmetrically β-Substituted Porphyrin Liquid Crystals: Influence of the Chemical Structure on the Mesophase Ordering
✍ Scribed by Segade, Antoni; Castella, Mercè; López-Calahorra, Francisco; Velasco, Dolores
- Book ID
- 126161427
- Publisher
- American Chemical Society
- Year
- 2005
- Tongue
- English
- Weight
- 313 KB
- Volume
- 17
- Category
- Article
- ISSN
- 0897-4756
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📜 SIMILAR VOLUMES
The dependence of the rotation of the mesogenic unit around its long axis (prelaxation) on the actual mesophase in liqid crystalline polymethac ylates and polyacrylates was studied by dielectric spectroscopy in the frequency range from 10-2Hz to 106Hz and in a temperature range from 170 K to 430 K.
Bromination of meso-tetraphenylporphyrin, H 2 TPP with controlled amounts of N-bromosuccinimide at ambient conditions in CHCl 3 produced b-dibromo and tribromotetraphenylporphyrins. The regiochemistry of the ZnTPPR 3 (R = Br, Ph) complexes indicate the antipodal substitution at the b-pyrrole positio