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机构地区:[1]宁波大学应用固体化学研究中心,浙江宁波315211
出 处:《化学试剂》2013年第7期635-640,共6页Chemical Reagents
基 金:宁波大学王宽诚幸福基金
摘 要:水热条件下,Ni(NO3)2.6H2O与间硝基苯甲酸(HL=m-NO2C6H4COO)及4,4'-联吡啶(4,4'-bpy)反应形成二维层状聚合物2∞[(NiL2)(4,4'-bpy)4/2]。结构分析表明,Ni(Ⅱ)原子与间硝基苯甲酸配位形成NiL2单元,该单元通过4,4'-联吡啶桥联形成具(44.62)拓扑的二维层状配位聚合物。相邻层与层之间通过间硝基苯甲酸之间的芳环堆积作用形成二重穿插的α-Po拓扑结构。此外变温磁化率显示标题配合物中心Ni原子间存在铁磁耦合作用,最佳拟合结果为g=2,D=79.15 cm-1,J=15.49 cm-1,zJ'=0.34 cm-1,ro=0.78,一致性因子R=8.95×10-3。并通过单晶X-射线衍射分析、元素分析、红外光谱及热重分析对其进行表征。Abstract: A novel 2D coordination complex,{[Ni(m.02NC6H4COO)2](4,4'-bpy)4/2}( HL = m-nitro-benzoic acid,4,4'-bpy = 4,4'- bipyridine) ,has been synthesized through the Ni (NO3 )2" 6H20 reacting with 4,4'-bipyridine and 3-nitrobenzoic acid under hydrothermal conditions. The NiL2 unit in the title com- plex are interconnected by four 4,4'-bpy to form ladder-like 2D (44-62 ) topological networks. Topologically, the 2D layers are further interlinked into a twofold interpenetration three-di- mensional (3D) supramolecular framework via strong-stac-king interaction. Variable-temperature ( 2 - 300 K) magnetic susceptibility measurements indicate the occurrence of weak ferromagnetic interaction between the nickel ions. The best fitting results for the data above 20 K were g = 2, D = 79. 15 cm-l,J=15.49 cm-l,zJ' =0.34 cm-J,ro =0.78, 2/ 2 where R = , (Xo,d -2/ol,,d )Xob respectively. The title complex was further confirmed by elemental analyses, IR, XRD.TG/DTA and single crystal X-ray diffrnctian
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