摘要
采用水热方法,选用配体5-(4-竣基苯氧基)烟酸(H2cpna)与1,2-二(4-吡啶基)乙烷(dpea)或1,2-二(4-吡啶基)乙烯(dpey)分别与ZnCl2、CoCl2·6H2O和NiCl2·6H2O在 160 ℃温度下反应,合成了3个配位聚合物:[Zn(μ3-cpna)(μ-dpea)0.5]n(1)、[Co(μ3-cpna)(μ-dpey)0.5]n(2)和[Ni(μ3-cpna)(μ-dpey)0.5(H2O)]n(3).这些配合物为稳定的结晶固体,我们通过红外光谱、元素分析、热重分析和单晶X射线衍射分析对其进行了表征.单晶X射线衍射分析表明,3个配合物的晶体属于三斜晶系P(1)空间群.配合物1～3呈二维层状结构.我们考察了这些配合物在Knoevenagel缩合反应中的催化活性.研究表明,配合物1和2在室温下对Knoevenagel缩合反应表现出有效的催化活性.同时对反应参数进行了优化,对底物范围也进行了研究.
Abstract
Three zinc(Ⅱ),cobalt(Ⅱ),and nickel(Ⅱ)coordination polymers,namely[Zn(μ3-cpna)(μ-dpea)0.5]n(1),[Co(μ3-cpna)(μ-dpey)0.5]n(2),and[Ni(μ3-cpna)(µ-dpey)0.5(H2O)]n(3),have been constructed hydrothermally using H2cpna(5-(4-carboxyphenoxy)nicotinic acid),dpea(1,2-di(4-pyridyl)ethane),dpey(1,2-di(4-pyridyl)ethylene),and zinc,cobalt,and nickel chlorides at 160 ℃.The products were isolated as stable crystalline solids and were characterized by IR spectra,elemental analyses,thermogravimetric analyses,and single-crystal X-ray diffraction analyses.Single-crystal X-ray diffraction analyses revealed that three compounds crystallize in the triclinic system,space group P(1).Compounds 1-3 show 2D layer structures.The catalytic activities in the Knoevenagel condensation reaction of these compounds were investigated.Compounds 1 and 2 exhibit effective catalytic activities in the Knoevenagel condensa-tion reaction at room temperature.For this reaction,various parameters were optimized,followed by the investiga-tion of the substrate scope.CCDC:2335676,1;2335677,2;2335678,3.
基金项目
广东省科技创新战略专项资金项目(pdjh2024b541)
万方数据