基于硫修饰芳香羧酸配体的一维Cd配合物:合成、结构及荧光传感性质

1-D Cd Complexes based on Sulfur-decorated Aromatic Carboxylic Acids:Syntheses,Structures and Fluorescence Sensing Properties

利用硫修饰柔性羧酸配体在水热条件下合成了两个一维结构的Cd配合物:[Cd(L1)(5,5′-dmbpy)]n(1)和[Cd(L2)(dibp)]n(2)(H2L1=2,2′-(1,3-亚苯基)双(亚甲基))二(硫基)苯二羧酸、H2L2=2,2′-(1,4-亚苯基)双(亚甲基))二(硫基)苯二羧酸、dibp=1,3-双[(1H-咪唑-1-基)甲基]苯、5,5′-dmb′py=5,5-二甲基-2,2-联吡啶).两个配合物均为一维链状结构.荧光测试表明,两个配合物均能够在DMF溶剂中快速高效地选择性识别Fe^(3+)和Cr_2O_7^(2-)离子,配合物1对Fe^(3+)和Cr_2O_7^(2-)离子的结合常数分别为2.72×104和3.59×103 M-1,检测限分别为1.34和4.90μM;配合物2对Fe^(3+)和Cr_2O_7^(2-)离子的结合常数分别为5.23×104和1.56×103 M-1,检测限分别为2.09和5.86μM.该论文详细讨论了荧光传感机理.

Two new one-dimensional complexes,namely,[Cd（L1）（5,5′-dmbpy）] n （1）, [Cd（L2）（dibp）] n （2） （H 2 L1=2,2′-[benzene-1,3-diylbis（methanediylsulfanediyl）]dibenzoic acid,H 2L2=2,2＇-[benzene-1,4-diylbis（methanediylsulfanediyl）] dibenzoic acid,5,5′-dmbpy=5,5′-DiMethyl-2,2′-dipyridyl,dibp=1,3-bis[（1H-imidazol-1-yl）methyl]benzene）,have been solvothermally synthesized and fully characterized. The fluorescence measurements reveal that each complex exhibits selectivity and sensitivity towards Fe 3＋ and Cr 2O^ 2- 7 ions in DMF. For complex 1, the binding constants to Fe 3＋ and Cr 2O 2^- 7 ions were 2.72×10 4 and 3.59×10 3 M ^-1 , respectively. And the detection limits were 1.34 and 4.90 μM, respectively. For complex 2, the binding constants to Fe^ 3＋ and Cr 2O ^2- 7 ions were 5.23 × 10 ^4 and 1.56 × 10 ^3 M -1 , respectively. The detection limits were 2.09 and 5.86 μM, respectively. Furthermore, the sensing mechanism was investigated and discussed in details.