Sen, P and Mukherjee, S and Patra, Amitava and Bhattacharyya, Kankan (2005) Solvation dynamics of DCM in a DPPC vesicle entrapped in a sodium silicate derived sol-gel matrix. Journal of Physical Chemistry B, 109 (8). pp. 3319-3323. ISSN 1520-6106

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Abstract

Solvation dynamics of 4-(dicyanomethylene)-2-methyl-6(p-dimethylaminostyryl) 4H-pyran (DCM) has been studied in a dipalmitoyl-phosphatidyleholine (DPPC) vesicle entrapped in a sodium silicate derived sol-gel glass. Solvation dynamics in DPPC in a sol-gel glass is described by two components of 350 +/- 50 ps (50 %) and 2300 200 ps (50 %) with a total dynamic Stokes shift of 1300 cm(-1). The fast component (350 ps) is similar to the fast component in a DPPC vesicle in bulk water (320 50 ps). This component may be ascribed to the dynamics of the water molecules inside the water pool of the vesicle. However, the slow component (2300 200 ps) is about 2.5 times slower compared to the slow component of solvation dynamics of DCM in a DPPC vesicle in bulk solvent (900 100 ps). The anisotropy decay of DCM in a DPPC vesicle both in sol-gel glass and in bulk water exhibits a very fast initial decay with a large residual anisotropy, which does not decay in similar to10 ns. The time scale of anisotropy decay is very different from that of solvation dynamics.

Item Type:	Article
Subjects:	Crystal Chemistry, Thermodynamics, Phase Equilibria
Divisions:	Sol Gel
Depositing User:	Bidhan Chaudhuri
Date Deposited:	20 Mar 2012 10:02
Last Modified:	20 Mar 2012 10:02
URI:	http://cgcri.csircentral.net/id/eprint/1283

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