基于2-吡啶甲醛肟配体的Ni_(2)^(Ⅱ)Zn_(2)^(Ⅱ)簇配合物的合成、晶体结构、磁性及光催化性能(英文)

Synthesis,crystal structure,magnetic properties,and photocatalytic activity of Ni^(Ⅱ)_(2)Zn^(Ⅱ)_(2)cluster complex based on 2-pyridinealdoxime ligand

在溶剂热条件下,以2-吡啶甲醛肟(HL)为主配体,Zn(OAc)_(2)·2H_(2)O和NiCl_(2)·6H_(2)O为金属盐,合成了一个Ni_(2)^(Ⅱ)Zn_(2)^(Ⅱ)簇配合物[Ni_(2)Zn_(2)(L)_(4)Cl_(2)(CH_(3)O)_(2)](1),通过元素分析、红外光谱、单晶X射线衍射等对其结构进行了表征。研究了该配合物的磁性及光催化降解染料的性能,结果表明:配合物1属于正交晶系,Pna21空间群,其分子中包含2个NiⅡ离子,2个ZnⅡ离子,4个L-配体,2个Cl-离子和2个CH_(3)O-离子。磁性研究表明NiⅡ…NiⅡ离子间存在弱的反铁磁相互作用。光催化降解染料的研究结果表明该配合物对甲基橙和罗丹明B有较好的降解活性,降解率分别达到83.9%和71.1%。进一步探讨了光催化降解染料的作用机理。

Under solvothermal conditions,the reaction of 2-pyridinealdoxime(HL)with NiCl_(2)·6H_(2)O and Zn(OAc)_(2)·2H_(2)O has led to a Ni^(Ⅱ)_(2)Zn^(Ⅱ)_(2)cluster complex with composition[Ni_(2)Zn_(2)(L)_(4)Cl_(2)(CH_(3)O)_(2)](1).This complex was characterized by elemental analysis,IR spectroscopy,single-crystal X-ray diffraction,etc.The results show that 1 belongs to the orthorhombic system with the Pna21 space group.The structure of 1 contains two NiⅡions,two ZnⅡions,two Cl-ions,four L-ligands,and two CH_(3)O-anions.The magnetic properties and photocatalytic activity toward the degradation of dyes were investigated.Magnetic susceptibility measurements at 2-300 K for the microcrystals of 1 revealed antiferromagnetic NiⅡ…NiⅡinteractions.1 exhibited excellent photocatalytic capability in the degradation of methyl orange(MO)and rhodamine B(RhB)within 180 min under ultraviolet radiation.The degradation efficiencies reached 83.9%and 71.1%respectively.The mechanism of photocatalytic dye degradation was further discussed.CCDC:2205562.