A novel and simple cyanide chemosensor 2-（naphthalen-1-ylmethylene）malononitrile（L） was designed and synthesized via a green chemistry method in water without using any catalyst.The chemosensor showed an excellent sensitivity and selectivity for CN in aqueous solution.The detection limit could be as low as 1.6×10~7 moI/L（0.16μmol/L）,which is far lower than the WHO guideline of 1.9μmol/L cyanide for drink water.
By applying an indirect strategy,a new copper(II)complex of a thiosemicarbazone L has been successfully developed as a colorimetric cbemosensor for the sensitive detection of mercury(II)ions.In the presence of copper(II)ions,the colorless so-lution of L became yellow;however,upon the addition of traces of mercury(II)ions,the yellow color faded to colorless im-mediately.Other ions,including Fe^(3+),Ag^(+),Ca^(2+),Zn^(2+),Pb^(2+),Cd^(2+),Ni2+,Co^(2+),Cr^(3+)and Mg^(2+)had a negligible influence on the probe behavior.The detection limits were 5.0×10^(-6)M and 3.0×10^(-7)M of Hg^(2+)using the visual color changes and UV-vis changes respectively.Test strips based on Cu-L were fabricated,which could act as a convenient and efficient Hg^(2+)test kits.
