| 含取代基苯基羧酸与柔性含氮配体构筑的三个过渡配位化合物的合成、晶体结构与物理性质 |
| Three Transition Metal Coordination Complexes Based on the Substituted Benzenecarboxylic acid and Flexible N-donor Co-ligands: Syntheses, Crystal Structures, and Physical Properties |
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| 摘要: 利用3,5-二硝基苯甲酸(3,5-DNBH)，1,2-双咪唑亚甲苯(1,2-bimb)与三种过渡金属盐通过水热反应成功地构筑三个过渡金属配位化合物，即，[M(3,5-DNB)2(1,2-bimb)] [M = Co(ΙΙ) (1), Cd(ΙΙ) (3)]和[Zn(3,5-DNB)2(1,2-bimb)]n (2)。通过红外光谱、元素分析、单晶和粉末X-射线表征了这三个化合物。化合物1和3是同构的，含有一个双核单元[M2(COO)2] (M = Co(ΙΙ) (1), Cd(ΙΙ) (3))，该双核单元由金属离子、3,5-二硝基苯甲酸根以及1,2-bimb分子构成。双核单元再通过O???π弱相互作用形成超分子结构，该弱相互作用是通过3,5-二硝基苯甲酸根上的硝基氧原子与1,2-bimb上的苯环所形成。化合物2是一维链结构，链与链之间再通过3,5-二硝基苯甲酸根和1,2-双咪唑亚甲苯配体上苯环之间所形成π???π相互作用，从而形成了一个超分子结构。室温条件下研究了化合物2和3分散在甲醇中的荧光性质。热重测试结果显示三个化合物具有相对较高的热稳定性。可见光照射条件下化合物1对罗丹明B具有一定的催化降解能力。此外，直流磁化率结果显示化合物1中金属离子之间存在反铁磁相互作用。 |
| 关键词: 过渡金属配位化合物 磁性 光催化性能 |
| 基金项目: 国家自然科学基金;其它;高校基金 |
| Abstract: The hydrothermal reactions of 3,5-dinitrobenzoic acid (3,5-DNBH), 1,2-bis(imidazol-1-ylmethyl)benzene (1,2-bimb) and transition metal salts result in three new transition metal coordination complexes, namely, [M(3,5-DNB)2(1,2-bimb)] [M = Co(ΙΙ) (1), Cd(ΙΙ) (3)] and [Zn(3,5-DNB)2(1,2-bimb)]n (2). These complexes were characterized by IR spectra, elemental analyses, single-crystal and powder X-ray diffraction analyses. Complexes 1 and 3 are isostructural and contain a dinuclear [M2(COO)2] (M = Co(ΙΙ) (1), Cd(ΙΙ) (3)) unit made up of metal ions, 3,5-DNB- and 1,2-bimb ligands, which are further formed to the supramolecular structures by the O???π interactions between the nitro group oxygen atom of 3,5-DNB- anions and the benzene ring of 1,2-bimb molecules. Complex 2 features a 1D chain structure, which are further packed to the supramolecular structure by the π???π interactions between the benzene rings from the 3,5-DNB anions. The fluorescence properties of the dispersion methanol solution of complexes 2-3 have been investigated at room temperature. Relatively high thermal stabilities are found in the three complexes according to the TGA cures. Photocatalytic studies of 1 indicate good degradation ability over Rhodamine B (RhB) under visible light irradiation. Furthermore, the dc magnetic susceptibility measurement of 1 reveals that dominant antiferromagnetic interactions are propagated between the Co(ΙΙ) ions in 1. |
| Keywords: transition metal coordination complexes magnetic property photocatalytic activity |
| 投稿时间：2016-05-09 修订日期：2016-06-21 |
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