Photochromism of a Spiropyran in the Presence of a Dendritic Fibrous Nanosilica; Simultaneous Photochemical Reaction and Adsorption,The Journal of Physical Chemistry A

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Photochromism of a Spiropyran in the Presence of a Dendritic Fibrous Nanosilica; Simultaneous Photochemical Reaction and Adsorption
The Journal of Physical Chemistry A ( IF 2.7 ) Pub Date : 2017-10-13 00:00:00 , DOI: 10.1021/acs.jpca.7b08466
Tetsuo Yamaguchi ₁ , Ayan Maity ₂ , Vivek Polshettiwar ₂ , Makoto Ogawa ₁

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The photoinduced adsorption of a photochromic spiropyran (1-(2-hydroxyethyl)-3,3-dimethylindolino-6′-nitrobenzopyrylospiran) onto a dendritic fibrous nanosilica (DFNS) was investigated. By UV irradiation, the colorless suspension containing the spiropyran and DFNS changed to blue without stirring, while it turned to red by the irradiation under stirring. These two colors were attributed to the photogenerated merocyanine in a non polar environment (in toluene, blue) and on a protic environment (on DFNS, red). The long lifetime of the adsorbed merocyanine on DFNS (red) and the easy separation of DFNS from the suspension made it possible to follow the kinetics of the photoinduced adsorption as a pseudo-first order reaction with the rate constant of 0.0279 s^–1. The rate limiting process was suggested to be the adsorption of the merocyanine onto DFNS.

中文翻译：

螺旋藻在树状纤维纳米二氧化硅中的光致变色；同时光化学反应和吸附

研究了光致变色螺吡喃（1-（2-羟乙基）-3,3-二甲基吲哚基-6'-硝基苯并吡咯螺烷）在树状纤维纳米二氧化硅（DFNS）上的光诱导吸附。通过紫外线照射，含有螺吡喃和DFNS的无色悬浮液在不搅拌的情况下变为蓝色，而在搅拌下通过照射变为红色。这两种颜色归因于在非极性环境（在甲苯中，蓝色）和在质子环境中（在DFNS上，红色）中光生的花青。DFNS（红色）上吸附的花青素的使用寿命长，并且DFNS易于从悬浮液中分离，因此可以遵循光诱导吸附动力学，作为拟一级反应，速率常数为0.0279 s ^–1。限速过程被认为是花青素在DFNS上的吸附。

更新日期：2017-10-13

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