含混合多齿螯合配体双缺口立方烷型四核Mn配合物的合成、晶体结构与磁性研究  

Synthesis, Crystal Structure and Magnetic Properties of a Double-Cuboidal [Mn4] Cluster Containing Mixed Multidentate Chelating Ligands

作　　者：王会生[1] 

机构地区：[1]绿色化工过程教育部重点实验室,武汉工程大学化工与制药学院,武汉430074

出　　处：《无机化学学报》2014年第3期522-528,共7页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21201136);武汉工程大学科学研究基金(No.10122012)资助

摘　　要：本文报道了一个含混合多齿螯合配体的四核Mn配合物Na2[MnIII2MnII2(pdmH)2(L)2(N3)2]·2CH3OH·2H2O(1·2CH3OH·2H2O,pdmH2为2,6-吡啶二甲醇,H2L为2,6-吡啶二甲醇与2,2-二吡啶酮水合物的脱水物),并对其进行单晶结构分析、红外、元素分析和磁性研究。单晶结构分析表明,该化合物属于三斜晶系P1空间群,分子中2个Mn2+、2个Mn3+及6个来自pdmH-或L2-配体的O原子构成1个双缺口立方烷结构。磁性研究表明Mn2+与Mn3+之间为弱的反铁磁性耦合作用(J1=-0.89 cm-1,J2=-1.13 cm-1),Mn3+离子之间为稍强的铁磁性耦合作用(J3=3.20 cm-1),基态自旋值S=2,交流磁化率研究表明,在所测试条件下,其虚部没有表现出单分子磁体所具有的频率依赖现象。In this paper, a tetranuclear Mn cluster containing mixed multidentate chelating ligands, Na2[Mn2ⅢMn2Ⅱ（pdmH）2（L）2（N3）2]·2CH3OH·2H2O（1·2CH3OH·2H2O, pdmH2 is 2, 6-pyridinedimethanol and H2L is the production of dehydration condensation between pdmH2 and the gem-diol form of di-2-pyridylketone） has been reported. The obtained complex was fully characterized by X-ray single crystal structural diffraction, IR, elemental analysis and magnetic investigation. The structural analysis indicates that the complex crystallizes in the triclinic system, P1 space group, and in the complex, two Mn2＋ ions, two Mn3＋ ions and six O atoms from pdmH- or L2- ligands comprise a double-cuboidal core. Magnetic studies indicate that within the cluster, while the magnetic coupling interactions between Mn2＋ and Mn3＋ are weak antiferromagnetic with the values being J1=-0.89 cm-1 and J2=-1.13 cm-1, the magnetic interaction between Mn3＋ ions is slightly strong ferromagnetic with the value being J3=3.20 cm-1. The value of the ground state S is 2, and from ac magnetic susceptibility investigation, the complex do not possess frequency-dependent that the single molecule magnets possess. CCDC： 957203.

关 键 词：四核Mn簇合物 晶体结构 磁性 混合多齿螯合配体 单分子磁体 

分 类 号：O614.711[理学—无机化学] O646.8[理学—化学]