A colorimetric chemosensor for Cu2+/Hg2+based on a cycloruthenated 2-phenylbenzimidazole

A cyclometalated ruthenium complex (1) with 2-phenylbenzimidazole as the ligand was synthesized and used as a colorimetric chemosensor to detect Hg2+ and Cu2+. It is interesting that the presence of Hg2+ caused a blueshifted absorption of 1 from 560 to 450 nm resulting in a solution color change from red to yellow, while the addition of Cu2+ resulted in an attenuated absorption along with the solution color changing from red to colorless. Their corresponding detection limits were calculated to be 0.25 & mu;M for Hg2+ and 0.45 & mu;M for Cu2+, respectively. Moreover, the slips of paper were dyed with complex 1 and then successfully used to recognize Hg2+ and Cu2+ by naked eyes, respectively. Furthermore, 1 was also used to determine Hg2+ and Cu2+ in some spiked water samples, respectively.

Automated summary

A cyclometalated ruthenium complex (1) with 2-phenylbenzimidazole as the ligand was synthesized and used as a colorimetric chemosensor to detect Hg2+ and Cu2+. The presence of Hg2+ caused a blueshifted absorption and a solution color change from red to yellow, while the addition of Cu2+ resulted in an attenuated absorption and a color change from red to colorless. The detection limits were calculated to be 0.25 μM for Hg2+ and 0.45 μM for Cu2+. Moreover, complex 1 was used to recognize Hg2+ and Cu2+ in dyed paper strips and spiked water samples, respectively.