A novel reversible fluorescent probe for Pd²⁺ based on a rhodamine-containing selenide (Rh–Se) was designed, synthesized and fully characterized. The probe Rh–Se showed a high selectivity and sensitivity with a detection limit of 32 nM for Pd²⁺ ions. The formation of a complex Rh–Se/Pd²⁺ was confirmed by HRMS. DFT calculations revealed that the proposed square planar geometry is the most stable form of the metallic complex Rh–Se/Pd²⁺. The probe Rh–Se showed to have high potential for the detection of residual Pd²⁺ in synthetic cross-coupling products and simulated pharmaceutical Pd²⁺- contaminated products.

中文翻译：

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通过新型基于硒代罗丹明的荧光和比色化学传感器对钯（II）进行纳摩尔检测

设计，合成并充分表征了一种基于含若丹明的硒化物（Rh-Se）的新型Pd ²⁺可逆荧光探针。Rh-Se探针显示出高选择性和灵敏度，对Pd ²⁺离子的检测极限为32 nM 。HRMS证实了复合物Rh-Se / Pd ²⁺的形成。DFT计算表明，所建议的正方形平面几何形状是金属络合物Rh-Se / Pd ²⁺的最稳定形式。Rh-Se探针显示出检测残留Pd ^2+的高潜力在合成交叉偶联产品和模拟药物Pd ^2+中被污染。