A multidentate ligand chromophore, combining rhodamine, triazole, and pyridine units, was identified and developed for the first time. Using triazole and pyridine rings as coordinating functional recognition groups, it was expected to selectively recognize Sn²⁺ to form some stable 5-member or 6-member rings with nitrogen and oxygen atoms. Under the optimized conditions, the ligand chromophore could selectively react with trace Sn²⁺ in CH₃CN/H₂O (99/1, v/v), accompanying with obvious changes in fluorescent spectrum, ultraviolet-visible spectrum and visual color. For fluorescent analysis, a turn-on fluorescence at 587 nm was found and increased linearly in the range of 1.2–6.2 × 10⁻⁷ mol L⁻¹ Sn²⁺ from colorless to orange. For ultraviolet-visible one, a new absorption peak at 560 nm emerged with a linear range of 2.0–11.0 × 10⁻⁷ mol L⁻¹ Sn²⁺ from colorless to pink. The action mechanism between the ligand chromophore and Sn²⁺ was confirmed basing on ultraviolet-visible titration, ¹H NMR titration, Job's plot, binding constants and theoretical calculation in detail.

首次鉴定和开发了结合罗丹明，三唑和吡啶单元的多齿配体发色团。使用三唑和吡啶环作为配位的功能识别基团，期望选择性地识别Sn ²⁺形成一些具有氮和氧原子的稳定的5元或6元环。在优化的条件下，配体发色团可以选择性地与CH ₃ CN / H ₂ O（99/1，v / v）中的痕量Sn ²⁺反应，同时荧光光谱，紫外可见光谱和视觉颜色发生明显变化。对于荧光分析，发现在587 nm处有开启荧光，并在1.2–6.2×10 ^-7  mol L ^-1范围内线性增加Sn ²⁺从无色变为橙色。对于紫外线可见光，在560 nm处出现了一个新的吸收峰，从无色到粉红色的线性范围为2.0–11.0×10 ^-7  mol L ^-1 Sn ²⁺。通过紫外可见滴定，¹ H NMR滴定，Job's图，结合常数和理论计算，确定了配体发色团与Sn ²⁺之间的作用机理。