摘要
设计合成了2种新型N-芳基香豆素甲基酮缩氨基硫脲受体分子S1和S2,利用紫外-可见(UV-Vis)吸收光谱考察了其对Fe3+,Hg2+,Ag+,Ca2+,Cu2+,Zn2+,Pb2+,Cd2+,Ni2+,Cr3+和Mg2+等阳离子的识别作用.结果表明,当加入Cu2+时,溶液颜色立刻由无色变为黄色,而加入其它阳离子则无变化,从而实现了对Cu2+的裸眼检测,具有专一选择性比色识别效果.通过计算可知,受体分子S2对Cu2+的络合常数大于S1,且主客体间形成1∶1的配合物.受体分子S2对Cu2+的检出限为2.0×10-7mol/L,稳定常数Ks=1.02×105L/mol.另外,在EDTA存在时,配合物可以释放出Cu2+,与EDTA结合,表现出对Cu2+的"off-on"模式.
Two new N-aryl coumarin methyl ketone thiosemicarbazone receptors were designed and synthesized. The binding properties of the receptors with cations such as Fe3＋, Hg2＋, Ag＋, Ca2＋, Cu2＋, Zn2＋, Pb2＋, Cd2＋, Ni2＋, Cr3＋ and Mg2＋ in DMSO were investigated by UV-Vis spectroscopy. A clear color change from colorless to yellow was observed upon the addition of Cu2＋ to the solution of the two receptors in DMSO by naked-eyes and a single selectivity colorimetric recognition. The results showed that the two receptors had a better selectivity for Cu2＋, but exhibited no evident binding with others cations. The data showed that the two receptors had different binding abilities with Cu2＋. The UV-Vis data indicated that a 1：1 stoichiometry complex was formed between the receptor and Cu2＋. The detection limit of the sensor S2 toward Cu2＋ is 2.0×10-7 mol/L and an association constant Ks of 1.02×105 L/mol was measured. The sensing of Cu2＋ by this sensor was found to be reversible, with the Cu2＋-induced color being lost upon the addition of EDTA. The process of titrating sensor S2 with Cu2＋ is reversible, and compound S2 could be used as an off-on switch chemosensor.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第11期2452-2456,共5页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:21064006
21161018)
甘肃省自然科学基金(批准号:1010RJZA018)
教育部长江学者和创新团队发展计划(批准号:IRT1177)资助
关键词
缩氨基硫脲
铜离子
阳离子识别
比色识别
Thiosemicarbazone
Copper ion
Cation recognition
Colorimetric recognition
