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| Titel: |
Design and characterization of novel supramolecular liquid crystals involving multiple hydrogen bonds |
| Auteur: |
Li, Min Guo, Chaowei Wu, Yuqing |
| Verschenen in: |
Liquid crystals |
| Paginering: | Jaargang 29 (2002) nr. 8 pagina's 1031-1037 |
| Jaar: |
2002-08-01 |
| Inhoud: |
A novel type of liquid crystalline system, namely 5-[4-(4-methoxyphenylazo)phenyloxyalkyloxy]isophthalic acidhydrazides (Dn, n = 3, 6, 10) was designed and synthesized. The FTIR spectra of the Dn compounds were examined in the range 4000-1000 cm-1 at different temperatures. The results showed that the stretching vibration frequencies of the NH and C=O groups, and the NH2 deformation shifted to lower frequencies with decrease of temperature, while out-of-plane NH bending shifted slightly to higher frequency. Intermolecular hydrogen bonding between NH, NH2 and C=O groups is proposed and the schematic supramolecular Dn structure is given. This may explain the higher Dn transitional temperatures and their smectic phase behaviour compared with that of 5-[4-(4-methoxyphenylazo)phenyloxyalkyloxy]isophthalic acid diethyl esters. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 2 van 18 gevonden artikelen
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