Azido- and thiocyanato-cobalt(II) complexes based pyrazole ligands

The reactions of pyrazole based ligands with Co(II) salts in the presence of NaN3 or NH4NCS afforded the cationic-anionic complexes [Co(bdmpzpy)(2)][Co(N-3)(4)] (1) and [Co(bdmpzpy)(2)][Co(NCS)(4)]center dot 2CH(3)NO(2) (2) containing tetrathiocyanato- and tetraazido-Co(II) complex anions as well as the mononuclear complexes [Co(bepza)(NCS)(2)] (3), [Co(tedmpza)(NCS)ClO4 center dot 1/2H(2)O (4) and [Co(tedmpza)(N-3)]ClO4 center dot H2O (5) where bdmpzpy = 2,6-bis[(3,5-dimethyl-pyrazol-1H-yl)-methyllpyridine, bepza = bis(ethyl-pyrazol-1H-yl)amine and tedmpza = tris(3,5-dimethyl-ethyl-pyrazol-1H-yl)amine. The complexes were structurally characterized by elemental microanalyses, IR and UV-Vis spectroscopy and by single crystal X-ray crystallography. (C) 2014 Elsevier Ltd. All rights reserved.