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Hydrophobic Pockets in a Nonpolymeric Aqueous Gel: Observation of such a Gelation Process by Color Change

Maitra, Uday and Mukhopadhyay, Samrat and Sarkar, Arnab and Rao, Photon and Indi, SS (2001) Hydrophobic Pockets in a Nonpolymeric Aqueous Gel: Observation of such a Gelation Process by Color Change. In: Angewante Chemi International Edition, 40 (12). pp. 2281-2283.

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Abstract

Studies on aqueous and organogels derived from low molecular mass species have been of considerable interest in recent years because of the many potential applications envisaged.[1] While gel formation in aqueous and nonaqueous media by polymers and biopolymers is a well-documented phenomenon,[2] detailed study of low molecular mass gelators has been embarked upon only during the past decade. Recently published examples of small molecule organogelators include steroids,[3] carbohydrates,[4] anthryl derivatives,[5] and urea.[6] We recently reported the first example of the gelation of organic fluids that was promoted by a donor acceptor interaction.[7] Although there is a resurgence in the study of low molecular mass organogelators, there is little activity in the investigation of analogous hydrogelators.[8]Herein we report that a novel tripodal[9] cholic acid derivative 1 forms gels in aqueous media with remarkable efficiency, and that the gelation process creates highly hydrophobic pockets in a predominantly aqueous environment. We have also demonstrated for the first time the sol to gel transition for a nonpolymeric gel by a color change.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to WILEY-VCH Verlag.
Keywords: hydrophobic;gelation;organogels;biopolymers;polymers;gels;aggregation;hydrophobic effect;materials science;steroids
Department/Centre: Division of Chemical Sciences > Organic Chemistry
Division of Biological Sciences > Microbiology & Cell Biology
Date Deposited: 26 Jul 2005
Last Modified: 19 Sep 2010 04:19
URI: http://eprints.iisc.ernet.in/id/eprint/3395

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