Three ref homochiral coordination polymers involving two three-dimensional structural architectures: Syntheses, structures and magnetic properties

摘要

The preparations and properties of three ref homochiral three-dimensional (3D) coordination polymers, [M(D-cam)(pyz)(H_2O))2]_n (M=Co ⑴ and Ni (2); D-H_2cam=(+) D-camphoric acid; pyz = pyrazine) and [Mn_2(D-cam)_2(H_2O)_2] (3), under solvothermal conditions is described. Single-crystal X-ray diffraction analyses revealed that all of compounds are homochiral 3D structure. 1 and 2 are isostructural and crystallize in the trigonal space group P3_221, while 3 crystallizes in monoclinic space group P2_1. The structure of 1 and 2 consists of metal-D-cam helical chains which are pillared with pyrazine ligands into a 3D framework structure and 3 features a 3D homochiral framework involving one-dimensional manganese-carboxylate chains that are aligned parallel to the b axis. Magnetic susceptibility data of all compounds were collected. The findings indicate that μ_2-pyrazine dominate weak antiferromagnetic coupling within 1 and 2, while 3 exhibits antiferromagnetic behavior through the carboxylate groups of D-cam ligand.