Syntheses, structures and characterization of novel cobalt(II) mono- and bi-triazole complexes

Using the bi- and mono-triazole ligand, two novel cobalt(II) complexes [Co(L1)2(NCS)2(H2O)2]·2H2O (1) and [Co3(L2)6(NCS)4(H2O)2](NCS)2·H2O (2) (L1=4-[3-(1,2,4-triazolyl)-1,2,4-triazole] and L2=4-aminotriazole) have been synthesized. The crystal structures of 1 and 2 have been determined by X-ray single-crystal diffraction. 1 has the mononuclear fundamental structure unit while 2 form the linear trinuclear structure unit. 1 and 2 were furthermore assembled into two-dimensional (2D) network and three-dimensional (3D) supramolecular complex via the intermolecular hydrogen-bonds, respectively. The complexes 1 and 2 also have been characterized by elemental analysis, FT-IR, UV/vis spectra.