基于环金属钌(Ⅱ)配合物的亚硝酸盐比色传感器

Colorimetric detection of nitrite by a cyclometallated ruthenium(Ⅱ)complex in aqueous solution

金属钌配合物Ru(ppy)(bpy)2+(1,bpy=2,2’-二联吡啶,Hppy=2-苯基吡啶)可用于检测水溶液中的亚硝酸盐。在p H<5.8的缓冲溶液中,该配合物在400 nm到700 nm范围内的强吸收因亚硝酸根的加入而淬灭,溶液的颜色由深红色变为浅黄色。这种明显的颜色变化表明它可以作为亚硝酸根的比色传感器,检测限为22μmol/L。

A cyclometallated ruthenium complex Ru（ppy）（bpy）2＋ （1, bpy=2,2＇-bipyridine, Hppy=2-phenylpyridine） was synthesized and used as a chemo-sensor to detect nitrite in aqueous system. It is interesting that complex 1 exhibited almost entire disappearance of MLCT absorptions in the range of 400 nm to 700 nm upon adding nitrite to the buffer solutions （pH〈5.8） of complex 1. Moreover, a remarkable color change from deep-red to light-yellow was observed, indicating that it can serve as a sensitive ＂naked-eye＂ indicator for nitrite. The limit of detection of nitrite was calculated as 22 μmol/L.