In situ control of photochromic behavior through dual photo-isomerization using cobaloxime complexes with a spiropyran derivative and 2-cyanoethyl ligands
In situ control of photochromic behavior through dual photo-isomerization using cobaloxime complexes with a spiropyran derivative and 2-cyanoethyl ligands
复制标题
使用具有螺吡喃衍生物和 2-氰乙基配体的钴肟配合物通过双光异构化原位控制光致变色行为
DOI：
10.1039/c8ce00982a
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发表时间：
2018
期刊：
影响因子：
3.1
通讯作者：
Yasuda Nobuhiro
中科院分区：
文献类型：
--
作者：
Sekine Akiko;Tanaka Masato;Uekusa Hidehiro;Yasuda Nobuhiro
合成了一种新的光致变色螺吡喃衍生物，并将其与2-氰乙基作为轴向配体合成了新型的双光致变色钴肟配合物。通过可见光对2-氰乙基进行光异构化，以控制螺吡喃衍生物的原位光致变色行为。当用UV光照射晶体时，含有2-氰乙基基团的晶体的颜色从黄色变为深棕色。当晶体在室温下保持在黑暗中时，颜色恢复到原始的黄色。在UV照射前暴露于可见光时，与中心钴原子键合的2-氰乙基异构化为1-氰乙基，并保留单晶形式。棕色晶体的热褪色速率与没有可见光照射的晶体不同。在每个晶体中的苯并吡喃部分周围的空腔体积的差异很好地解释。
A new photochromic spiropyran derivative is synthesized and used with a 2-cyanoethyl group as an axial ligand in new dual photochromic cobaloxime complexes. Photoisomerization of the 2-cyanoethyl group by visible light is performed to control the photochromic behavior in situ of the spiropyran derivative. The color of the crystal containing 2-cyanoethyl groups changes from yellow to dark brown when the crystals are irradiated with UV light. The color returns to the original yellow color when the crystals are kept in the dark at room temperature. On exposure to visible light before UV irradiation, the 2-cyanoethyl group bonded to the central cobalt atom is isomerized to the 1-cyanoethyl group with retention of the single crystal form. The thermal color fading rates of the brown crystals are different from those without visible light irradiation. The difference is explained well by the cavity volume around the benzopyran moiety in each crystal.