开放骨架亚磷酸锰(NH4)2 Mn3(HPO3)4和Mn(HPO3)的离子热合成与表征

Ionothermal Syntheses and Characterization of Open-framework Manganese Phosphites(NH_4)_2Mn_3( HPO_3)_4 and Mn(HPO_3)

采用离子热法,在保持其它合成因素相同的条件下,仅改变离子液体种类,合成了2例不同结构的开放骨架亚磷酸锰化合物(NH4)2Mn3(HPO3)4(1)和Mn(HPO3)(2),并对其单晶结构进行了解析.化合物1是由MnO6八面体和亚磷酸根构筑成的二维层状结构化合物,其中铵根离子填充在层间平衡骨架电荷;化合物2是由MnO6八面体和亚磷酸根通过共享顶点氧原子连接构筑而成的致密的三维开放骨架.通过扫描电子显微镜(SEM)、X射线单晶结构解析、X射线粉末衍射(XRD)和元素分析(ICP-AES及CHN)对化合物进行了详细表征.化合物1的磁学性质研究结果表明其结构中的的Mn2+间存在较强的反铁磁相互作用.

Two open-framework manganese phosphites, （NH4）2Mn3（HPO3）4（1） and Mn（HPO3）（2）, were synthesized under ionothermal conditions and characterized by single crystal X-ray diffraction. The two com-pounds were synthesized under the same conditions, but the structures were different with the use of diffe-rent ionic liquids. The framework structure of compound 1 is built up from MnO6 octahedra and phosphite groups, giving rise to a two-dimensional framework with NH4＋ cations filling between the layers;the structure of com-pound 2 consists of a 3D condensed framework of edge-sharing MnO6 octahedra linking to [ HPO3 ] units via oxygens. The compounds were further characterized by scanning electron microscopy（SEM）, powder X-ray diffraction（ PXRD） and inductively coupled plasma（ ICP） , and the magnetic measurements results reveal that strong antiferromagnetic interaction exists in compound 1 .