一种水中稳定的锌(Ⅱ)金属有机骨架用于检测四环素

A stable Zinc(Ⅱ)metal-organic framework in water for the detection of tetracycline

采用溶剂热法合成1个锌金属有机骨架(Zn-MOF):[Zn(H_(2)L)(4,4′-bpy)]n(1),其中H_(4)L=1,1′-乙烷基联苯-3,3′,5,5′-四羧酸,4,4′-bpy=4,4′-联吡啶。通过单晶X射线衍射、元素分析和热重分析等方法对其结构进行表征。单晶结构分析表明,1属于单斜晶系C2/c空间群,H_(2)L^(2)-配体采取单齿配位模式连接Zn形成一维链,4,4′-bpy连接一维链构筑成二维波浪状网。该化合物在水中表现出良好的稳定性,并且可作为高灵敏度、高选择性荧光探针检测四环素(TET),其检出限为0.17μmol·L^(-1)。1可成功用于延河水中TET的测定。此外,还研究了1对TET的荧光猝灭机理。

A Zinc(Ⅱ)metal-organic framework(Zn-MOF),namely[Zn(H_(2)L)(4,4'-bpy)]n(1),where H_(4)L=1,1'-ethylbi-phenyl-3,3',5,5'-tetracarboxylic acid,4,4'-bpy=4,4'-bipyridine,was successfully synthesized under solvothermal conditions.The structure was characterized by single-crystal X-ray diffraction,elemental analysis,and thermogravimetric analysis.The single crystal structure analysis shows that 1 belongs to the monoclinic C2/c space group and H_(2)L^(2)-ligands adopt monodentate coordination mode,connecting with Zn(Ⅱ)to form 1D chains.Finally,the 1D chains are connected by 4,4'-bpy to form a 2D wavelike network.1 shows good stability in water,and can be used as a highly sensitive and selective fluorescent probe to detect tetracycline(TET)with a detection limit of 0.17μmol·L^(-1).1 can be successfully used for the determination of tetracycline in Yanhe River water.In addition,the possible fluorescence quenching mechanisms of 1 were also studied.CCDC:2212375,1.