| 一个含苯甲酸配体的Mn-Ce混合金属簇合物的合成、晶体结构与磁性研究 |
| Synthesis, Crystal Structure, and Magnetic Properties of a Mn-Ce Mixed-Metal Complex Containing Benzoic Ligands |
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| 摘要: 本文使用(NH4)2Ce(NO3)6氧化Mn2+法合成了1个结构新颖的Mn-Ce混合金属簇合物[Mn3Ce2(O)5(O2CPh)9(CH3OH)3]·2CH3CN(1·2CH3CN,HO2CPh代表苯甲酸),并对其进行元素分析、红外光谱、单晶X-射线结构分析、磁性等表征。结构分析表明,化合物1·2CH3CN属于三斜晶系P1空间群,结构中2个Mn4+离子、2个Ce4+离子和4个桥连μ3-O原子组成1个不规则的立方烷,然后通过另1个桥连μ3-O原子与另1个Mn3+离子相连。晶胞内分子间没有氢键作用,但存在较强的π-π堆积作用。磁性研究表明,簇合物内Mn离子之间存在铁磁性耦合作用,基态自旋值S=5和磁各向异性参数D=-0.31 cm-1,交流磁化率没有频率依赖现象。 |
| 关键词: Mn-Ce混合金属簇合物 晶体结构 磁性 苯甲酸 |
| 基金项目: 国家自然科学基金(No.21201136)和武汉工程大学科学研究基金(No.10122012)资助项目。 |
| Abstract: In this paper, a novel Mn-Ce mixed-metal complex [Mn3Ce2(O)5(O2CPh)9(CH3OH)3]·2CH3CN (1·2CH3CN, HO2CPh is benzoic acid) has been synthesized using the synthetic method of oxidation Mn2+ ions by (NH4)2Ce(NO3)6. The obtained complex were fully characterized by X-ray single crystal structural diffraction, IR, elemental analysis, and magnetic investigation. The structure analysis indicates that the complex crystallizes in triclinic system, P1 space group. In the complex, two Mn4+ ions, two Ce4+ ions and four bridging μ3-O atoms comprise an irregular cubane which is further linked to the other Mn3+ ion by another μ3-O atom. There are no hydrogen bonds but slightly strong π-π stacking interactions between clusters in the crystal cell. Magnetic investigation shows that weak ferromagnetic interactions between Mn ions are present within the cluster, and the values of the spin ground state S and magnetic anisotropy are 5 and-0.31 cm-1, respectively. The complex do not possess frequency-dependent on alternating-current magnetic susceptibilities. CCDC: 912993. |
| Keywords: Mn-Ce mixed-metal complex crystal structure magnetic property benzoic acid |
| 投稿时间：2012-12-01 修订日期：2013-05-09 |
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| 王会生,潘志权.一个含苯甲酸配体的Mn-Ce混合金属簇合物的合成、晶体结构与磁性研究[J].无机化学学报,2013,29(7):1459-1464. |
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