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.
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
2,2＇-Bisbenzimidazole derivative （L） was designed as a fluorescent chemosensor for Fe3＋. This structurally simple chemosensor displays significant fluorescence quenching with increasing concentrations of Fe3＋. L exhib- ited high selectivity and antidisturbance for Fe3＋ among environmentally relevant metal ions in aqueous media. The method of Job＇s plot indicated the formation of 1 ; 2 complex between L and Fe3＋, and the possible binding mode of the system was also proposed. In addition, further study demonstrates the detection limit on fluorescence response of the sensor to Fe3＋ is down to 10-7 mol·L-1 range. The binding mode was investigated by fluorescence spectra, ESI-MS, IR data, ^1H NMR, ^13C NMR and crystal data.
Taibao Wei Jun Liu Hong Yao Qi Lin Yongqiang Xie Bingbing Shi Peng Zhang Xingmei You Youming Zhang
