Novel Solid-state Photochromic Reaction of Azobenzene Derivative Controlled by Appended Photoreactive Group
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Photochromic solid-state trans–cis isomerization of the 4-aminoazobenzene moiety was observed for the first time in (<i>trans</i>-4-aminoazobenzene)(β-cyanoethyl)bis(dimethylglyoximato)cobalt(III) after β–α isomerization of the β-cyanoethyl group on exposure to UV light. The UV spectra revealed that β–α isomerization occurred first, followed by the trans–cis transformation. When the crystal was exposed to visible light, only the β–α isomerization of the cyanoethyl group occurred, with retention of the single-crystal form. The crystal structure before and after the β–α photoisomerization showed that the isomerization is important in this photochromic trans–cis transformation.
- Chemistry Letters
Chemistry Letters 41(8), 795-797, 2012
The Chemical Society of Japan