Two Co(Ⅱ) Coordination Polymers Based on 3,5-Di(4H-1,2,4-triazole-4-yl)benzoic Acid Ligand:Syntheses, Structures and Magnetic Property

摘要

Two Co(Ⅱ) coordination polymers,namely [Co(L)Cl]n (1) and [Co(L)(CH3COO)]n (2),{HL =3,5-di(4H-l,2,4-triazole-4-yl)benzoic acid},were synthesized under hydrothermal conditions.Compound 1 crystallizes in orthorhombic system,space group Pmma with a =7.032(5),b =11.555(8),c =8.185(5) (A),V=665.1(7) (A)3,Z=2,Dc =1.746 g/cm3,F(000) =350,Mr =349.61,μ =1.504 mm-1,the final R =0.0568 and wR =0.1739 for 2312 observed reflections with I ＞ 2σ(I).Compound 2 crystallizes in orthorhombic system,space group Pmma with a =7.7505(17),b =11.391(3),c =8.0298(18) (A),V=708.9(3) (A)3,Z =2,Dc =1.748 g/cm3,F(000) =378,Mr =373.20,μt =1.245 mm1,the final R =0.0350 and wR =0.0873 for 5239 observed reflections with I ＞ 2σ(I).Single-crystal X-ray analyses revealed that complexes 1 and 2 exhibit similar 2D layer structures with uncoordinated carboxyl as dangling arms.The neighboring layers are further connected by these arms,leading to interest 2D → 3D polythreading frameworks.Moreover,the magnetic susceptibility study indicates compound 1 exhibits antiferromagnetic behavior.