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.
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.
A novel smart metal-organic gel（MOG） formed from biscarboxyl-functionalized benzimidazole derivative（D11） in the presence of lead nitrate has been investigated.The critical gel concentration for the formation of MOG was just 0.36 wt%,which exhibits a super gelation capability of D11.The coordination of the metal to the ligand D11 was found to play a vital role in the construction of the supramolecular MOG.Microstructures determined by SEM observation demonstrated that the MOG was formed by intertwined fibrils.Interestingly,the MOG exhibits pH-induced,thermo-induced,and chemical-induced reversible gel-sol transition.Meanwhile,this supramolecular MOG shows desirable absorption ability of methyl orange dye molecules in aqueous solution.
Hong YaoXing-Mei YouQin LinJun-Jian LiYing GuoTai-Bao WeiYou-Ming Zhang
