锰钠混合金属双聚体簇合物的合成、晶体结构与磁性

Synthesis,crystal structure and magnetic properties of a manganese-sodium mixed metal dimer cluster

由于在信息存储、量子计算等方面存在潜在的应用,单分子磁体受到越来越多的国内外化学家、物理学家和材料学家的极大关注.使用多齿螯合配体设计更高能垒的单分子磁体化合物是目前该领域研究的关键,本文使用两个多齿螯合配体2,2-二吡啶酮和三羟甲基乙烷与醋酸锰在乙腈溶液里反应,然后结晶、过滤,最终得到一个锰钠混合金属双聚体配合物,并对该化合物进行单晶结构、红外、磁性等表征.单晶结构分析表明,该化合物属于单斜晶系P2/c空间群,六个中心锰原子和四个钠离子形成一个单体,其中六个锰原子形成一个正八面体,四个钠离子连接在正八面体交替的四个面上,两个单体又通过两个氧原子桥连起来.磁性研究表明,该化合物中锰原子之间为反铁磁性耦合.

Due to the potential applications in high-density information storage and in quantum computing,single molecule magnets have been attracted widely interests by chemists, physical scientists and material scientists from all over the world. Currently, the crucial thing is designing novel single molecule magnets complexes with higher blocking temperature using multidentate chelating ligands. Two chelating ligands of di-2-pyridyl ketone, 1,1,1-tris（hydroxymethyl）ethane were reacted with manganese acetate in Me CN, and a manganese-sodium mixed metal dimer cluster was obtained after crystallized and filtered, finally it was characterized by X-ray single crystal structural diffraction, infrared spectrum and magnetic investigation. Structural investigation indicates that the complex crystallizes in the triclinic P2 / c space group; in the complex, a monomer contains six manganese ions and four sodium ions, in which six manganese ions form an regular octahedron with four sodium ions located on the four alternating faces of the regular octahedron, then two monomers in the complex are linked by two oxygen atoms. Magnetic studies indicate that the overall antiferromagnetic coupling interactions between Mn3＋ions within the structure are present.