基于2-氨基-3-羟基-吡啶Schiff碱的双核Ni(Ⅱ)和Zn(Ⅱ)配合物:合成、超分子结构和光谱性质（英文）

Binuclear Nickel(Ⅱ) and Zinc(Ⅱ) Complexes Based on 2-Amino-3-hydroxy-pyridine Schiff Base: Syntheses, Supramolecular Structures and Spectral Properties

合成了2个2-氨基-3-羟基-吡啶Schiff碱双核Ni(Ⅱ)和Zn(Ⅱ)配合物,[Ni(L^1)(DMF)]_2(1)(H_2L^1=4-羟基-3-((3-羟基-吡啶-2-亚氨基))-苯并吡喃-2-酮)和[Zn(L^2)(H_2O)]_2·2DMF(2)(H_2L^2=2-((3,5-二溴-2-羟基)-氨基)-吡啶-3-醇),并通过元素分析、红外光谱、紫外-可见吸收光谱、荧光光谱及X射线单晶衍射分析等手段进行了表征。X射线单晶衍射分析结果表明:配合物1和2均具有双核结构,均由2个金属离子和2个配体单元以及2个配位的溶剂分子组成,不同的是配合物2含有2个溶剂分子。配合物1和2都是单斜晶系、P2_1/c空间群,且中心金属Ni(Ⅱ)和Zn(Ⅱ)离子的空间构型均为五配位的扭曲的四方锥。此外,配合物1和2通过分子间氢键、C-H…π及π…π作用形成3D超分子结构。此外,讨论了H_2L^1,H_2L^2及其相应的Ni(Ⅱ)和Zn(Ⅱ)配合物的荧光性质。配体H_2L^1和H_2L^2呈现蓝色发射,最大发射波长λ_(em)分别为457和473 nm,而配合物1和2显示绿色发射,λ_(em)分别为543和538 nm。

Two 2-amino-3-hydroxy-pyridine Schiff base binuclear Ni(Ⅱ)and Zn(Ⅱ)complexes,[Ni(L1)(DMF)]2(1)(H2L1=4-hydroxy-3-((3-hydroxy-pyridin-2-ylimino)-methyl)-chromen-2-one)and[Zn(L2)(H2O)]2·2DMF(2)(H2L2=2-((3,5-dibromo-2-hydroxy-benzylidene)-amino)-pyridin-3-ol)have been synthesized and characterized by elemental analyses,IR,UV-Vis,emission spectra and X-ray crystallography.X-ray crystallography analyses showed that complexes 1 and 2 all possess the binuclear structures,consisting of two metal ions,two ligand units and two coordinated solvent molecules,in which the difference is that complex 2 contains two solvent molecules.Complexes 1 and 2 crystallize in the monoclinic space group P21/c and the center Ni(Ⅱ)and Zn(Ⅱ)are all five-coordinated slightly distorted square pyramid geometry by four O atoms and one imine N atoms.Complex 1(or 2)links some other molecules into an infinite 3D network supramolecular structure via intermolecular hydrogen bond,C-H…πorπ…πstacking interactions.And the fluorescent properties of H2L1,H2L2 and their corresponding Ni(Ⅱ)and Zn(Ⅱ)complexes have been discussed.The ligands H2L1 and H2L2 exhibit blue emission with the maximum emission wavelengthλem=457 and 473 nm,and complexes 1 and 2 show green emission withλem=543 and 538 nm.CCDC:1855900,1;1855901,2.