Aggregation and photoresponsive behavior of azobenzene–oligomethylene–glucopyranoside bolaamphiphiles

Narayan, Gopinathan and Kumar, Saleesh NS and Paul, Somak and Srinivas, Oruganti and Jayaraman, Narayanaswamy and Das, Suresh (2007) Aggregation and photoresponsive behavior of azobenzene–oligomethylene–glucopyranoside bolaamphiphiles. In: Journal of Photochemistry and Photobiology A: Chemistry, 189 (2-3). pp. 405-413.

PDF Aggregation.pdf Restricted to Registered users only Download (1MB) | Request a copy

Abstract

The self-aggregation behavior of a series of photoresponsive bolaamphiphiles consisting of a central azobenzene moiety linked to terminal sugar groups via oligomethylene spacers in water/DMSO mixed solvents are reported. Changes in the absorption spectra in these solvent mixtures indicated the formation of tightly packed H-aggregates. The ease of formation and the stability of the aggregates were observed to increase with increase in the length of the oligomethylene spacers. Microscopic studies indicated the formation of vesicles or fibers depending upon the length of the oligomethylene spacers. Disruption of the aggregates induced by photoisomerization of the azobenzene unit and their reformation via the subsequent thermal cis to trans isomerization was also investigated.

Item Type:	Journal Article
Publication:	Journal of Photochemistry and Photobiology A: Chemistry
Publisher:	Elsevier
Additional Information:	Copyright of this article belongs to Elsevier.
Keywords:	H-Aggregates;Bolaamphiphiles;Photoisomerization;Self-assembly
Department/Centre:	Division of Chemical Sciences > Organic Chemistry
Date Deposited:	25 Sep 2007
Last Modified:	19 Sep 2010 04:39
URI:	http://eprints.iisc.ac.in/id/eprint/11906

Actions (login required)

View Item