一例混合配体构筑的钴(Ⅱ)一维配位聚合物的合成、晶体结构与磁性质

基于萘膦酸羧酸酯配体和氯化钴在水热条件下自组装得到配位聚合物Co(5-pncee)(4,4′-bpy)(H₂O)₃(5-pnceeH₂)]·2H₂O(1)(5-pncee H₂=5-phosphono -naphthalene-1-carboxylic acid ethyl ester, 4,4′-bpy=4,4′-bipyridinyl)。采用单晶衍射(X-Ray)、元素分析(EA)、红外光谱(FT-IR)、粉末衍射(PXRD)、热重分析(TG-DTG)对配位聚合物进行晶体结构和热稳定性表征。晶体结构分析表明:该配位聚合物结晶于三斜晶系,P1空间群,a=0.824 06(6) nm,b=1.014 48(9) nm,c=1.151 44(8) nm。配位聚合物呈线性链状结构。相邻的链由中等强度的氢键连接,形成超分子层,层间被膦酸配体的有机基团所填充。通过研究配位聚合物1的磁性质,表明Co(II)离子存在自旋轨道耦合和/或Co(II)离子之间存在反铁磁相互作用。

Synthesis,Crystal Structure and Magnetic Properties of 1D Cobalt Naphthalene Phosphonate Carboxylate Complex

Self-assembly of naphthalene phosphonate carboxylate ligand and cobalt(Ⅱ) chloride hexahydrate, 1D coordination polymer, namely Co(5-pncee)(4,4′-bpy)(H₂O)₃(5-pnceeH₂)]·2H₂O(1) (5-pnceeH₂=5-phosphono -naphthalene-1-carboxylic acid ethyl ester, 4,4′-bpy=4,4′-bipyridinyl) was hydrothermally synthesized and characterized by single-crystal X-ray diffraction, EA, FT-IR spectroscopy, powder X-ray diffraction (PXRD), and thermogravimetric analysis (TG-DTG). Structure analyses reveal that compound 1 crystallized in the triclinic system, space group of P1, a=0.824 06(6) nm,b=1.014 48(9) nm, c=1.151 44(8) nm. It shows a linear chain structure. The neighboring chains are connected by moderately strong hydrogen bonds forming a supramolecular layer. The interlayer spaces are filled with the organic groups of the phosphonate ligands. Magnetic properties were investigated for compound 1, it is found that there is spin orbit coupling and/or antiferromagnetic interaction between Co(II) ions.