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A new rhodamine derivative as a single optical probe for the recognition of Cu2+ and Zn2+ ions

机译：一种新的若丹明衍生物作为单个光学探针，用于识别Cu2 +和Zn2 +离子

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摘要

A bifunctional colorimetric and fluorescent chemosensor of type 3,5-dinitro-2-hydroxy benzaldehyde rhodamine hydrazone (RHDN) was synthesized by the condensation of 3,5-dinitro salicylaldehyde and rhodamine B hydrazide. It was characterized using spectroscopic techniques and single crystal studies. The chemosensor RHDN exhibited remarkably enhanced absorbance and colour changes from colourless to pink color on binding with Cu2+ ions. In contrast, Zn2+ ions were identified by their selective binding with RHDN showing OFF-ON type fluorescence, which changes from colorless to orange color in ultra violet-light. The absorbance and emission pattern of RHDN adduct separately with Cu2+ and Zn2+ ions were restored with the addition of an aqueous solution of disodium salt of ethylenediaminetetraacetic acid. Thus, RHDN was found to be very robust and reversible in its binding with Cu2+ and Zn2+ ions separately.
机译：通过3,5-二硝基水杨醛与若丹明B酰肼的缩合反应合成了3,5-二硝基-2-羟基苯甲醛罗丹明hydr（RHDN）型双功能比色荧光化学传感器。使用光谱技术和单晶研究对其进行了表征。化学传感器RHDN与Cu2 +离子结合后，吸光度显着提高，颜色从无色变为粉红色。相反，Zn2 +离子通过与RHDN选择性结合而鉴定，显示出OFF-ON型荧光，该荧光在紫外光下从无色变为橙色。通过添加乙二胺四乙酸二钠盐水溶液，分别恢复了RHDN加合物与Cu2 +和Zn2 +离子的吸收和发射模式。因此，发现RHDN在其分别与Cu 2+和Zn 2+离子结合方面非常坚固并且可逆。

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