Raymond Wai-Yin Sun,* Ruo-Fan Xu, Huan-Quan Song, Camille Saint-Germain, Ming Zhang, Wen-Xiu Ni, Chun-Xia Chen, Catherine Hemmert, Heinz Gornitzka, and Dan Li*

Abstract: A gold(I)–pyrazolato complex has been designed as a luminescent probe for cysteine (Cys). Spectroscopy and microscopy experiments revealed that the complex would disintegrate in the presence of Cys to form gold–Cys fluorescent nanoparticles, and was found to enhance Cys to form rose-like microspheres in solution.

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