3,5-二硝基苯甲酸-叠氮铜金属-有机框架材料的合成、晶体结构及磁性研究

Synthesis,Crystal Structure and Magnetism of an Azido-Cu(Ⅱ)Metal-organic Framework with 3,5-dinitrobenzoic Acid

以3,5-二硝基苯甲酸为辅助配体,利用溶液法合成了一例新颖的叠氮-铜配合物[Cu(3,5-DNBA)(N3)]。通过元素分析,红外光谱和X射线单晶衍射对其组成、结构进行了研究。单晶结构研究表明,在配合物中,五配位的铜离子呈现了四角锥的几何构型,相邻的Cu(Ⅱ)离子依靠μ-1,1-叠氮离子和syn-syn-羧基桥连得到了1D金属链,同时,3,5-二硝基苯甲酸的一个硝基基团与铜离子配位,最终形成了配合物的3D金属-有机框架结构。对配合物的变温磁化率和变场磁化强度进行了研究,结果表明,配合物链内金属离子之间存在强的铁磁耦合作用。

Employing 3,5-dinitrobenzoic acid as auxiliary ligand, a novel azide-Cu （ II） coordination polymer, Cu（3,5- DNBA） （N3）, was synthesized with the solution method. The structure of the compound was characterized by elemental a- nalysis,IR and single-crystal X-ray diffraction. Single crystal structure analysis shows that the central Cu（ II ） ion in the compound presents five-coordinated tetragonal pyramid geometry. The adjacent Cu（ II ） ions are linked by/z-1,1-azido mo- tif and syn-syn-carboxylate bridge,yielding a formal 1D metal chain. Noteworthily,a nitro group on the 3,5-DNBA mole- cule coordinates to Cu（ II ） ion forming the three-dimensional （3D） network structure of the compound. The investigations of temperature-dependent magnetic susceptibilities and the field-dependent magnetizations indicate that significant ferro- magnetic coupling between intrachain metal ions occurs in the compound.