Acceleration of photochromism and negative photochromism by the interactions with mesoporous silicas†,Photochemical & Photobiological Sciences

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Acceleration of photochromism and negative photochromism by the interactions with mesoporous silicas†
Photochemical & Photobiological Sciences ( IF 2.7 ) Pub Date : 2019-04-30 00:00:00 , DOI: 10.1039/c9pp00081j
Tetsuo Yamaguchi _{1,

2,

3,

4} , Nattapat (Nut) Leelaphattharaphan _{1,

2,

3,

4} , Hojoon Shin _{1,

2,

3,

4} , Makoto Ogawa _{1,

2,

3,

4}

Affiliation

The adsorption of merocyanine dye onto mesoporous silicas with varied pore sizes (5.5, 9.4 and 2.2 nm) from the toluene solution of 1,3,3-trimethylindolino-6′-nitrobenzopyrylospiran under UV irradiation was investigated quantitatively. The photoinduced adsorption of merocyanine onto SBA-15 with the pore diameter of 9.4 nm followed the pseudo-second order kinetics and the rate constant was larger than that observed for MCM-41 (pore size of 2.2 nm) owing to the efficient diffusion of merocyanine. The maximum adsorbed amounts of the merocyanine dye was 152 mg g⁻¹ of SBA-15, which corresponded to the sufficiently high concentration of merocyanine in the pores (0.376 mol L⁻¹ of pore). The resulting red-colored hybrids (SBA-15 containing merocyanine) showed decoloration in the solid-state by visible light irradiation (negative photochromism). The conversion was high (about 80% at the photostationary state) under visible light irradiation at room temperature using a solar simulator (100 W). The red color was re-generated by storing the photochemically formed colorless samples in the dark at room temperature. The half-lives of the thermal coloration process were 2.6, 1.9 and 1.3 h for the MCM-41, SBA-15s with the BJH pore sizes of 5.5 and 9.4 nm, respectively. Since the coloration was affected by the diffusion of the molecules in the pores, larger pores provided the efficient molecular diffusion, leading to faster reactions.

中文翻译：

与中孔二氧化硅的相互作用加速了光致变色和负光致变色†

定量研究了1,3,3-三甲基吲哚基-6'-硝基苯并吡喃螺喃在紫外线下对花青染料在不同孔径（5.5、9.4和2.2 nm）的介孔二氧化硅上的吸附。孔径为9.4 nm的花青素在SBA-15上的光诱导吸附遵循拟二级动力学，并且由于花青素的有效扩散，其速率常数大于MCM-41观察到的速率常数（孔径为2.2 nm）。。黑色素花青素染料的最大吸附量为152 mg g ^-1的SBA-15，这对应于孔中足够高的黑色素花青素浓度（0.376 mol L ^-1的）。所得红色杂种（含有花青的SBA-15）在可见光照射下呈固态脱色（负光致变色）。使用太阳能模拟器（100 W）在室温下可见光照射下，转化率很高（在光平稳状态下约为80％）。通过在室温下将光化学形成的无色样品储存在黑暗中，可以重新产生红色。对于BJH孔径分别为5.5和9.4 nm的MCM-41，SBA-15，热显色过程的半衰期分别为2.6、1.9和1.3 h。由于着色受孔中分子扩散的影响，因此较大的孔可提供有效的分子扩散，从而导致更快的反应。

更新日期：2019-04-30

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