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 (ϕ_t→c) 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 cis → trans thermal isomerization while SDS reduces it.

中文翻译：

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胶束介质中1-烷基-2-（芳基偶氮）咪唑的铜（I）和银（I）配合物的光致变色行为

光致变色是一种快速可逆的结构变化，即使在光照射下甚至不到飞秒级，也受到环境的影响，例如介质的极性，存在非共价相互作用，氢键等。在这项工作中，胶束使用Triton-X-100在MeOH溶液中对[Cu（RaaiR'）₂ ] ClO ₄和[Ag（RaaiR'）₂ ] NO ₃（RaaiR ^' = 1-烷基-2-（芳基偶氮）咪唑）施加环境（CMC，在298 K时为108±1.16），CTAB（CMC，在298 K时为51.64±1.04）和SDS（CMC，在298 K时为207.01±1.51）。1-烷基-2-（芳基偶氮）咪唑经历反式到顺式和反之亦然在光照射下–N = N-键的异构化。光异构化的量子产率（ϕ _{t → c}）依次为-非离子胶束（Triton-X-100）>阳离子胶束（CTAB）>无胶束>阴离子胶束（SDS）。该顺至-反式异构化是一个热感应过程。的活化能顺-到-反式异构化是通过受控的温度（298-313 K）实验计算。Triton-X-100和CTAB放大了顺式→反式热异构化的活化能，而SDS则降低了活化能。