Abstract: In solvent⁃free condition, a new 1D chain holmium phosphite Ho(H2PO3)4(C6N2H16)0.5 (compound 1) decorated by phosphite groups has been synthesized using N,N'⁃Dimethylpiperazine (Me2ppz) as structure directing agent, and further been characterized by powder XRD, infrared spectroscopy, thermogravimetric, inductively coupled plasma and CHN elemental analyses. Single crystal X⁃ray diffraction analysis reveals that compound 1 crystallizes in the monoclinic crystal system with the P21/c space group. The structure of compound 1 is constructed by HoO6 octahedra and [H2PO3]- pseudo⁃pyramids units via vertex oxygen atoms. It is worth noting that compound 1 is the first rare earth phosphite compound which is synthesized in solvent⁃free condition. Moreover, a pair of left⁃ and righ⁃handed helical chains are present in the structure. In addition, coordination mode and geometry of lanthanide phosphonate, phosphate and phosphite are listed in this paper.

Key words: Solvent?free condition, Helical chain, Holmium phosphite

摘要： 采用无溶剂合成的方法，以N,N'⁃二甲基哌嗪(Me2ppz)为结构导向剂，合成了一个由亚磷酸单元修饰的一维链状结构的新型亚磷酸钬化合物Ho(H2PO3)4(C6N2H16)0.5 (1)，并通过粉末X⁃射线衍射、红外光谱、热重、ICP和CHN元素分析对其进行表征。单晶X⁃射线衍射分析结果表明，化合物1属于单斜晶系，P21/c空间群。其结构是由HoO6八面体和[H2PO3]-假四面体单元相互连接构成。值得注意的是，化合物1是第一个通过无溶剂合成获得的稀土亚磷酸化合物，并且在化合物1的结构中存在左右手螺旋链。

关键词: 无溶剂合成, 　双螺旋链, 　亚磷酸钬