Sunlight-induced degradation of squarazine-based cyanide complex through imine CN free rotation: Sensing, binding and degradation studies of anionic complex.

Poomanirajeshwari Kathirvelu, Murugan Gowripriya, Ariputhiran Muthulakshmi, Vanthana Jeyasingh, Kumaresan Murugesan, Sudha Lakshminarayanan, Selvapalam Narayanan, Lakshminarayanan Piramuthu
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Abstract

Sunlight-induced degradable squarazine based electron deficient receptor 3,4-bis((E)-2-((perfluorophenyl)methylene)hydrazinyl)cyclobut-3-ene-1,2-dione, L has been reported here. Naked-eye colorimetric analysis, UV-Vis, IR and 1H, 19F, 31P-NMR spectrometric results show that this receptor L high affinity with cyanide anion. The strength of the receptor L towards colorimetrically responded anions are calculated by UV-Vis spectrometric titrations and it is found to be 9.9597 × 103 for cyanide. Interestingly, upon exposure of those anionic complexes under sunlight, the colors of those respective anionic complexes are disappeared. From this result, it is clear that these anionic complexes are capable to discharge the bound anion via CN free rotation. As evidenced from spectroscopic and colorimetric results, it is also clear that this anionic complex is not only release the bound anion, but also undergone self-degradation upon sunlight exposure. To the best of our knowledge, this is the first example for cyanide sensing of anion accomplished with self-degradation of anion complex upon exposure on sunlight.

日光通过亚胺 CN 自由旋转诱导方嗪基氰化物络合物降解:阴离子络合物的传感、结合和降解研究。
本文报告了阳光诱导的可降解眯嗪基缺电子受体 3,4-双((E)-2-((全氟苯基)亚甲基)肼基)环丁烯-3-烯-1,2-二酮 L。裸眼比色分析、紫外可见光谱、红外光谱和 1H、19F、31P-NMR 光谱分析结果表明,这种受体 L 与氰阴离子具有很高的亲和力。通过紫外可见光谱滴定法计算受体 L 对显色阴离子的亲和力,发现氰化物的亲和力为 9.9597 × 103。有趣的是,当这些阴离子络合物暴露在阳光下时,它们各自的颜色都会消失。由此可见,这些阴离子络合物能够通过 CN 自由旋转来释放结合阴离子。从光谱和比色结果也可以看出,这种阴离子络合物不仅能释放出结合阴离子,还能在阳光照射下发生自我降解。据我们所知,这是第一个在阳光照射下阴离子复合物自我降解的阴离子氰化物传感实例。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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