新型Zn-MOFs的合成及对水中Fe^(3+),Cr_(2)O_(7)^(2-)离子的荧光传感

Synthesis of Novel Zn-MOFs,Its Crystal Structure and Fluorescence Sensor to Fe^(3+)Ion and Cr_(2)O_(7)2-Ion

通过水热法合成一种新型Zn-MOFs:[Zn(qs)(bmboxy)_(1.5)(H_(2)O)_(1.5)]n(CP1)(H_(2)qs=8-羟基喹啉-5-磺酸;bmboxy=1-(4-苯并咪唑)苯醚),采用X-射线单晶衍射、红外等表征。CP 1属三斜晶系,空间群为P 2/c,Zn(II)离子为五配位,形成一个畸变的三角双锥构型,bmboxy配体采取μ2桥联方式连接两个相邻的Zn(II)离子,呈二维网络结构。固体CP 1表现出较强的荧光性能,归因于配体内部π*-π的电子跃迁所致。实验表明,通过荧光猝灭机制,CP 1可以作为检测水溶液中Fe^(3+),Cr_(2)O_(2)-7离子的荧光传感材料,其检测限分别为1.67×10^(-4)M和2.04×10^(-5)M。

A novel Zn-MOFs,[Zn(qs)(bmboxy)_(1.5)(H_(2)O)_(1.5)]n(H_(2)qs=8-hydroxyquinoline-5-sulfonic acid;bmboxy=1-(4-benzimidazole)phenyl ether),was synthesized by hydrothermal method and characterized by single crystal X-ray diffraction,infrared spectroscopy,etc.CP 1 crystallized in the triclinic system with P 2/c space group.The central Zn(II)ion was five coordinated,forming a deformed triangular bipyramid structure.The bmboxy ligandadoptsμ2 mode bridging connected two adjacent Zn(II)ions,making CP 1 form a two-dimensional network structure.CP 1 showed strong fluorescence performance,which is attributed to theπ*-πtransition of the ligand.The experiment showed that CP 1 could be used as a fluorescence probe to detect Fe^(3+)and Cr_(2)O^(2-)_(7) ions in aqueous solutionthrough fluorescence quenching mechanism,the detection limits of them were 1.67×10^(-4)M and 2.04×10^(-5)M,respectively.