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H-2 NMR spectroscopic investigation of para-nitroazobenzene liquid crystals

H-2 NMR spectroscopic investigation of para-nitroazobenzene liquid crystals
H-2 NMR spectroscopic investigation of para-nitroazobenzene liquid crystals
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.
h-2 nmr, para-nitroazobenzene liquid crystal, orientational parameter azobenzene, storage, films
1005-9040
108-114
Li, M.
72430469-7491-49ea-88a0-9f8aed0abcb7
Luckhurst, G.R.
7807d1c6-54a1-414f-9abe-22de4d9c30f7
Timimi, B.A.
845f8bba-a04b-4e8d-adfe-51b13e9f29ca
Qiu, H.J.
04775d40-1ed6-4bda-9fff-cc989a808f85
Chen, X.F.
9aef343b-ec87-4b09-bf37-902611586e10
Li, M.
72430469-7491-49ea-88a0-9f8aed0abcb7
Luckhurst, G.R.
7807d1c6-54a1-414f-9abe-22de4d9c30f7
Timimi, B.A.
845f8bba-a04b-4e8d-adfe-51b13e9f29ca
Qiu, H.J.
04775d40-1ed6-4bda-9fff-cc989a808f85
Chen, X.F.
9aef343b-ec87-4b09-bf37-902611586e10

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.

Record type: Article

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.

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More information

Published date: 1 February 2001
Keywords: h-2 nmr, para-nitroazobenzene liquid crystal, orientational parameter azobenzene, storage, films

Identifiers

Local EPrints ID: 19551
URI: http://eprints.soton.ac.uk/id/eprint/19551
ISSN: 1005-9040
PURE UUID: d892c62a-9d4f-45e7-bd3b-72effcfa47a6

Catalogue record

Date deposited: 15 Feb 2006
Last modified: 17 Jul 2017 16:31

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