H-2 NMR spectroscopic investigation of para-nitroazobenzene liquid crystals
Li, M., Luckhurst, G.R., Timimi, B.A., Qiu, H.J. and Chen, X.F. (2001) H-2 NMR spectroscopic investigation of para-nitroazobenzene liquid crystals. Chemical Research in Chinese Universities, 17, (1), 108-114.
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Description/Abstract
The orientational order of two liquid crystals, namely, 6-[4-(4-nitrsphenylazo])phenyloxy] hexyl diethanolamines (C6) and 10-1-bromo[4-(nitrophenylazo)phenyloxy]alkane (B10) was studied by means of H-2 NMR spectroscopy with hexamethylbenzene-d(18) as the probe molecule. The results show that the directors in the smectic a phase of C6 and the nematic phase of B10 could be aligned, which was parallel to the magnetic field. The orientational order parameter of the solute molecules in C6 was about 0.2, while it is only 0.1 in B10, which is expected because the more ordered smectic phase tends to align solute molecules to a high level. Compared to the orientational order parameter of the solute in the SmC phase of 4[3,4,5-tris(4-dodecyloxybenzyloxy)-benzoyloxy]-4-(4 ' -dodecyloxybenzoyloxy)biphenyl (I) (P-2 = 0.14), it is larger in SmA. phase of C6. The relatively higher orientational order parameter of the solute in C6 is attributed to the formation of intermolesular H-bonds in the SmA phase of C6.
| Item Type: | Article |
|---|---|
| ISSN: | 1005-9040 (print) |
| Uncontrolled Keywords: | h-2 nmr, para-nitroazobenzene liquid crystal, orientational parameter azobenzene, storage, films |
| Related URLs: | http://www.elsevier.com/wps/fi...escription |
| Subjects: | Q Science > QD Chemistry L Education > LB Theory and practice of education > LB2300 Higher Education |
| Divisions: | University Structure - Pre August 2011 > School of Chemistry |
| ePrint ID: | 19551 |
| URI: | http://eprints.soton.ac.uk/id/eprint/19551 |
| Deposited On: | 15 Feb 2006 |
| Last Modified: | 01 Jun 2011 04:56 |
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