A Stable 'Three-in-one' Coordination Polymer

The title compound [Cu2(IB)2(HIB)2] 1 was synthesized via the hydrothermal reaction of CuSO4·5H2O and NaOH with 4-(1H-Imidazol-1-yl)benzoic acid (HIB), and characte- rized by elemental analysis and infrared spectra. The crystal of 1 crystallizes in monoclinic, space group C2/c with a = 24.513(8), b = 18.948(5), c = 17.248(6), β = 119.81(2)o, V = 6951(4)3, Z = 8, C40H30Cu2N8O8, Mr = 877.80, Dc = 1.678 g/cm3, F(000) = 3584 and μ(MoKα) = 1.295 mm-1. The final R = 0.0542 and wR = 0.1335 for 5398 observed reflections with I 2σ(I) and R = 0.0845 and wR = 0.1520 for all data. X-ray diffraction analysis reveals that the title complex is a unique ‘three-in-one’ crystal of coordination network through strong hydrogen bonds and coordination covalent bonds. The thermogravimetric analysis measurement showed that compound 1 has thermal stability as no strictly clean weight loss step occurs below 300 ℃.