摘要
在水和甲醇混合溶液中合成了3个配合物[Zn(DNBC)2(Im)2](1),[Cu(DNBC)2(Im)(H2O)](2)和[Co1.5(DNBC)4(Im)(CH3OH)(H2O)2](3)(DNBC=3,5-二硝基苯甲酸,Im=咪唑),并对其进行了表征,利用单晶X射线衍射仪测定了3个配合物的晶体结构.结果表明,配合物1中的Zn原子为四配位,具有扭曲的四面体构型,通过分子间氢键及范德华力形成了三维网状的超分子框架结构.配合物2中金属铜原子为五配位,分别与4个氧原子和1个咪唑氮原子配位,形成扭曲的四方锥体,再通过羧基和硝基与金属铜的连接形成了一维"Z"字链状结构.配合物3的空间群为P21/n,a=1.20876(7)nm,b=2.63287(16)nm,c=1.36466(9)nm,V=4.3045(5)nm3,Z=4,F(000)=2166,Co…Co原子之间的距离为0.3587 nm.在配合物3中,具有八面体配位构型的Co(Ⅱ)离子与μ-OH2组成的三核金属钴通过氢键与相邻的三核金属钴连接,Co(Ⅱ)离子与μ-OH2形成一维"Z"字链,并且配合物的空腔中包含未配位的咪唑和甲醇分子.配合物3的磁学性质测试表明,三核金属Co(Ⅱ)之间存在着反铁磁交换作用.
Three complexes,Zn（DNBC）2（Im）2（1）,Cu（DNBC）2（Im）（H2O）（2）,Co1.5（DNBC）4（Im）（CH3OH）（3,DNBC=3,5-dinitrobenzoic acid and Im=imidazole）,were synthesized in water-methanol mixture solution and characterized by elemental analysis and IR spectra.Their crystal structures were determined by single crystal X-ray diffraction.Complex 1 possesses tridimensional net-like supramolecular structure which is formed by intermolecular hydrogen bonding and van der Waals force,each Zn（Ⅱ） is in a 2O＋2N coordination mode,each four-coordinated Zn（Ⅱ） ion forms a distorted tetrahedral geometry.Complex 2 has a 1D zigzag chain networks,where each Cu（Ⅱ） is in a 4O＋N coordination mode,and each five-coordinated Cu（Ⅱ） ion forms a distorted square-pyramidal geometry.Complex 3 crystallizes in the monoclinic system with space group P21/n,a=1.20876（7） nm,b=2.63287（16） nm,c=1.36466（9） nm,V=4.3045（5） nm3,Z=4,F（000）=2166,the adjacent Co…Co distance is 0.3587 nm.Complex 3 possesses 1D zigzag chain composed by Co（Ⅱ） and μ-OH2,the adjacent triple-nuclear clusters of octahedral Co（Ⅱ） are bridged by μ-OH2 further through the hydrogen bond,resulting in the formation of channels,which are occupied by imidazole molecules and methanol molecules.Magnetic measurements of complex 3 indicate antiferromagnetic interactions between adjacent Co（Ⅱ） ions within the trimer.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2011年第9期2181-2186,共6页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:21064006)资助
