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.
A non-sulfur chemosensor based on an easy to prepare double naphthalene Schiff base is reported for the colorimetric and fluorometric dual-channel sensing of Hg2+ ions by taking advantage of the twisted intramolecular charge transfer (TICT) mechanism. This work provides a novel approach for the selective recognition of mercury ions. Moreover, this sensor serves as a potential recyclable component in sensing materials and the complex L-Hg2+ (L = 1-[(2-naphthalenylimino)methyl]-2-naphthalenol) can therefore be used as a fluorescent sensor for iodine anions. Notably, the color changes are very significant and all the recognition and recycling processes can be observed by the naked eye.
