Rhodamine-based derivatives for Cu2+ sensing: spectroscopic studies, structure-recognition relationships and its test strips

Yunxu Yang, Weiling Gao, Ruilong Sheng, Weili Wang, Hui Liu, Wumin Yang, Tianyi Zhang, Xuetao Zhang
Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy 2011 October 15, 81 (1): 14-20
A rhodamine spirolactam/2-hydrazinopyridine derivative was synthesized and characterized, which exhibited high selectivity to Cu(2+) over other metal cations. The Cu(2+) recognition of this rhodamine derivative could be detected by fluorescence spectra, absorption spectra and an obvious color change which was observed easily by naked-eyes. The binding of this rhodamine derivative to Cu(2+) is instantaneous and sensitive. Moreover, a linear relationship was found between the fluorescence intensity at 575 nm from 0.5×10(-6) M to 3.0×10(-6) M of Cu(2+) concentration, and the limit of detection (LOD) was at low concentration of 2.11×10(-8) M, this would benefit for the establishment of standard working curves in practical Cu(2+) detection. Additionally, we synthesized rhodamine spirolactam/2-aminomethylpyridine derivative and rhodamine spirolactam/phenylhydrazine derivative as analogs for elucidate the structure-recognition relationships. Finally, we prepared the test strips of rhodamine spirolactam/2-hydrazinopyridine derivative for practical chromogenic the Cu(2+) detection.

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