含有双螺旋链的配位聚合物[Co(dpa)prz_(0.5)]_n的合成、晶体结构及磁性质(英文)

Synthesis,Crystal Structure and Magnetic Properties of A Coordination Polymer [Co(dpa)prz_(0.5)]n with Double-Helix Chains

A coordination polymer [Co(dpa)prz0.5]n(1) with double-helix chains has been constructed hydrothermally using H2dpa(H2dpa=diphenic acid),prz(prz=piperazine) and Co(NO3)2.6H2O.The structure and magnetic properties of the complex were investigated.The complex crystallizes in triclinic system and P1 space group.Each Co atom is five-coordinated and takes a distorted tetragonal pyramid geometry.Two carboxylates of the H2dpa ligands bridge four Co(Ⅱ) ions to form infinite right-handed or left-handed helical-C-O-Co-chains.The two types of helical chains are interconnected to each other through the Co (Ⅱ) centers to produce double-helix chains.The chains form a 2D sheet through the coordination interaction of prz molecules between adjacent chains.The sheets are further interlinked by hydrogen bond interactions to generate 3D coordination frameworks.Magnetic studies for complex 1 show stronger antiferromagnetic coupling between the Co(Ⅱ) ions.

A coordination polymer [Co（dpa）prz0.5]n （1） with double-helix chains has been constructed hydrothermally using H2dpa （H2dpa=diphenic acid）, prz （prz=piperazine） and Co（NO3）2·6H2O. The structure and magnetic properties of the complex were investigated. The complex crystallizes in triclinic system and P1 space group. Each Co atom is five-coordinated and takes a distorted tetragonal pyramid geometry. Two carboxylates of the H2dpa ligands bridge four Co（lI） ions to form infinite right-handed or left-handed helical -C-O-Co- chains. The two types of helical chains are interconnected to each other through the Co（Ⅱ） centers to produce double-helix chains. The chains form a 2D sheet through the coordination interaction of prz molecules between adjacent chains. The sheets are further interlinked by hydrogen bond interactions to generate 3D coordination frameworks. Magnetic studies for complex 1 show stronger antiferromagnetic coupling between the Co（Ⅱ） ions. CCDC： 709275.