Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/54006
Title: Photochromic behaviour of Copper(I) and Silver (I) complexes of 1-alkyl-2-(arylazo)imidazoles in miceller media
Authors: Chowdhury, B
Mallick, D
Sarkar, K K
Sen, C
Sinha, C
Keywords: 1-Alkyl-2-(arylazo)imidazoles;Cu(I) and Ag(I) complexes;Photoisomerisation;Effects of micelle
Issue Date: Feb-2020
Publisher: NISCAIR-CSIR, India
Abstract: Photochromism, a fast reversible structural change even at less than a femto second order upon irradiation of light, is largely influenced by the environment such as, polarity of media, existence of non-covalent interactions, hydrogen bonding etc. In this work, the micelle environment has been imposed on [Cu(RaaiR')2]ClO4 and [Ag(RaaiR')2]NO3 (RaaiR' = 1-alkyl-2-(arylazo)imidazole) in MeOH solution using Triton-X-100 (CMC, 108 ± 1.16 at 298 K), CTAB (CMC, 51.64 ± 1.04 at 298 K) and SDS (CMC, 207.01 ± 1.51 at 298 K). 1-alkyl-2-(arylazo)imidazole undergoes trans-to-cis and vice-versa isomerization about –N=N- bond upon light irradiation. The quantum yield (ϕtc) of the photoisomerization follows the order - nonionic micelle (Triton-X-100) > Cationic micelle (CTAB) > no micelle > anionic micelle (SDS). The cis-to-trans isomerization is a thermally induced process. The activation energy of cis-to-trans isomerization is calculated by controlled temperature (298–313 K) experiment. Triton-X-100 and CTAB amplify the activation energy of cistrans thermal isomerization while SDS reduces it.
Page(s): 189-199
URI: http://nopr.niscair.res.in/handle/123456789/54006
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.59A(02) [February 2020]

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