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In Situ Formation of Phosphorescent Molecular Gold(I) Cluster in a Macroporous Polymer Film to Achieve Colorimetric Cyanide Sensing

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journal contribution
posted on 04.02.2014, 00:00 by Chenghua Zong, Li Rong Zheng, Wenhui He, Xiaoyan Ren, Chunhuan Jiang, Lehui Lu
A highly phosphorescent molecular Au­(I) cluster capable of rapid, sensitive, and selective detection of cyanide has been successfully fabricated. The origin of the outstanding sensing performance of the molecular Au­(I) cluster toward cyanide is justified by X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) analyses. The response mechanism employed with the molecular Au­(I) cluster and the cost-effectiveness in cyanide detection affords several key sensor features, making this molecular Au­(I) cluster-based sensor unique compared to other cyanide sensing schemes. Importantly, by exploring the phosphorescent properties of the molecular Au­(I) cluster in solid state, we demonstrate the first example of the molecular gold­(I) cluster-based macroporous sensing film for colorimetric detection of cyanide in complex samples, including red wine, coffee, juice, and soil. Remarkably, the as-prepared sensing film inherits the sensing ability of the molecular Au­(I) cluster, and offers a high mechanical flexibility and novel opportunities for real-time monitoring cyanide release in cassava manufacturing.