本文合成、表征了一种结构简单的罗丹明-氨乙基邻苯二甲酰胺衍生物(RP1).研究发现,在多种金属阳离子存在的条件下,RP1在丙酮/水溶液中对Cr3+具有高度选择性识别性能,在荧光增强的同时对Cr3+有明显的目视比色响应,颜色由无色变为粉红色,而其它共存的金属阳离子无干扰.定量分析结果显示RP1对Cr3+的结合计量比为1∶1,结合常数为3.43×104L/mol.识别机理研究表明,Cr3+通过可逆的配位诱导螺环开环机制与RP1进行相互作用,而非通过催化水解机制进行.
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