Synthesis, Structure and Magnetic Properties of a 3D Interpentrating Network Based on 4-Imidazol-1-yl-benzoic Acid and Azide Ligands

摘要

A new CoⅡ coordination complex, namely [Co(iba)(N3)]n, was prepared by the hydrothermal reaction of Co(NO3)2·6H2O with Na N3 in the presence of 4-imidazol-1-yl-benzoic acid(Hiba). Compound 1 crystallizes in orthorhombic, space group Pbca with a = 6.782(2), b = 19.93(5), c = 15.96(4) ?, V = 2157.2(3) ?3, Z = 8, C10H7O2N5 Co, Mr = 228.14, Dc = 1.774 g/cm3, F(000) = 1160, μ(Mo Kα) = 1.592 mm-1. The final R and w R are 0.0706 and 0.1990 for 1160 observed reflections with I > 2σ(I). Each iba- coordinates in a bidentate fashion with two CoⅡ ions and every two adjacent CoⅡ ions were connected by one azido ion to form a 3D two-fold interpenetrating framework. Thermogravimeteric analysis(TGA) of compound 1 reveals that the loss of moiety of azido ion occurs from 200 oC to about 260 oC and the framework begins to decompose above 300 oC. The magnetic property investigation of compound 1 demonstrates that it displays ferromagnetic coupling between CoⅡ ions.