The first example of half-sandwich cobalt(III) complex with hydrotris(pyrazolyl)borate ligand

摘要

This paper presents the synthesis, crystal structure and spectroscopic properties of a novel half-sandwich mononuclear cobalt(III) complex with hydrotris(3,5-dimethylpyrazolyl)borate ligand and thiocyanate [Tp~*Co(Hpz~*)(NCS)_2]·H_2O·CH_3OH(Tp~*: hydrotris(3,5-dimethyl-pyrazolyl)borate, Hpz~*:3,5-dimethylpyrazole). The structure was determined by X-ray diffraction. The complex crystallizes in the monoclinic system, space group C_c, a = 18.59(6)A, b = 10.536(3)A, c = 17.568(5)A, beta = 11.284(5)°, Z = 4, r_1 = 0.0501, wR_2 = 0.1179. The cobalt(III) ion in the complex is six-coordinated with nitrogen atoms, three from Tp~*, two from pyrazole and two from two thiocyanates, to form octahedral environment. The hydrogen atoms of O(2) of water molecule are connected by hydrogen bonds with S atoms of two adjacent complex molecules to form 1-D chains. The hydrogen atom of N(8) of complex molecule is connected by hydrogen bond with methanol. The spectroscopic results are consistent with the crystallographic study.