UNSPECIFIED (2002) Light induced changes in NO2-substituted rotaxanes: Switching behavior in a mechanically interlocked architecture. In: 6th International Conference on Frontiers of Polymers and Advanced Materials, MAR 04-09, 2001, RECIFE, BRAZIL.

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Abstract

Linear and nonlinear optical properties of thin films of pure fumrot, and mono -, as well as di - substituted with nitro group, rotaxanes were studied by m-lines spectroscopy and by third harmonic generation techniques, respectively. The molecules form, transparent in visible, good optical quality thin films by vacuum sublimation. The as deposited films exhibit, depending on substitution, optical birefringence. Ad 1.907 mum fundamental wavelength the chi((3)) (-3omega;omega,omega,omega) susceptibility varies between (1.990+/-0.007)x10(-12) esu (pure fumrot) and 1.809(+/-0.006)x10(-12) esu (di-substituted). The light illumination in the rotaxane absorption band leads to a reversible modification of the optical absorption spectrum and is associated at the same time with a decrease of the cubic susceptibility. The THG susceptibility recovers its initial value after a few days. The largest variation is observed in pure fumrot.

Item Type:	Conference Item (UNSPECIFIED)
Subjects:	Q Science > QD Chemistry
Journal or Publication Title:	MOLECULAR CRYSTALS AND LIQUID CRYSTALS
Publisher:	TAYLOR & FRANCIS LTD
ISSN:	1058-725X
Date:	2002
Volume:	374
Number of Pages:	14
Page Range:	pp. 343-356
Publication Status:	Published
Title of Event:	6th International Conference on Frontiers of Polymers and Advanced Materials
Location of Event:	RECIFE, BRAZIL
Date(s) of Event:	MAR 04-09, 2001
URI:	http://wrap.warwick.ac.uk/id/eprint/10889

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