Aggregation and photoresponsive behavior of azobenzene–oligomethylene–glucopyranoside bolaamphiphiles

Autor:	N. S. Saleesh Kumar, Somak Paul, Gopinathan Narayan, Narayanaswamy Jayaraman, O Srinivas, Suresh Das
Rok vydání:	2007
Předmět:	Absorption spectroscopy Photoisomerization General Chemical Engineering Vesicle General Physics and Astronomy General Chemistry Photochemistry Solvent chemistry.chemical_compound Azobenzene chemistry Moiety Self-assembly Isomerization
Zdroj:	Journal of Photochemistry and Photobiology A: Chemistry. 189:405-413
ISSN:	1010-6030
DOI:	10.1016/j.jphotochem.2007.03.003
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::306cb27f25c8105481e09aae3c258678 https://doi.org/10.1016/j.jphotochem.2007.03.003 Zobrazit plný text záznamu Full Text from ScienceDirect