钼-槲皮素的配位化学研究

Study on single-sweep polarography of Mo(Ⅵ)-quercetin

用单扫描极谱法研究了钼(Mo)与槲皮素(Qu)形成配合物的最佳实验条件及反应机理。在pH4.0的HAc NaAc缓冲溶液中,槲皮素与Mo(Ⅵ)络合并在-0.98V(vs.SCE)处产生一个灵敏的还原峰,其峰高与Mo(Ⅵ)浓度在4.0×10-6～1.8×10-5mol L范围内呈现良好的线性关系,检出限为3.0×10-6mol L。测得配合物组成Mo(Ⅵ)∶Qu=1∶3,表观稳定常数为1.33×1014。

The formation and mechanism of Mo(Ⅵ)-quercetin (Qu) complex were studied. The reduction wave of the was obtained by single-sweep polarography at the medium of HAc-NH4Ac buffer (pH 4.0). The peak potential was at -0.98 V(vs.S CE). The compos ition of the complex was determined to be Mo(Ⅵ)∶Qu=1∶3 and the form ation constant was found to be 1.33×1014.