Tris(4-bromo-1H-pyrazol-1-yl)borato derivatives of first-row transition and group 12 and 14 metals. X-ray crystal structure of [HB(4-Brpz)3]2 Cd. 113Cd solution NMR study of bis[poly(pyrazolyl)borato]cadmium complexes

Add time:07/12/2019    Source:sciencedirect.com

A series of metal complexes M[HB(4-Brpz)3]2 [HB(4-Brpz)3 = hydridotris(4-bromo-1H-pyrazol-1-yl)borate and M = Mn, Fe, Co, Ni, Cu, Zn, Cd, Pb] were obtained from reaction of K[HB(4-Brpz)3] and the appropriate metal salt in aqueous solution. These air-stable complexes are sparingly soluble in most common solvents; they have been investigated through elemental analysis, conductivity measurements, IR, UV-vis and, in the case of diamagnetic compounds, 1H and 13C NMR spectroscopy. The X-ray crystal structure of cadmium(II) bis[hydridotris(4-bromo-1H-pyrazol-1-yl)borate] has been resolved. Six-coordinate cadmium is present in a slightly distorted octahedron with the axes not linear [angles 176.8(3), 177.2(3) and 178.7(3)°]. The ‘bite’ of the ligand, i.e. NCdN angle, lies in the range 81.6(2)–84.1(3)° (weighted average 82.4(4)°). The CdN distances vary from 2.298(8) to 2.329(8) Å (weighted average 2.317(5) Å). The geometry around the B atom is tetrahedral. The NBN angles range from 105.8(8) to 110.5(7)° (weighted average 108.5(7)°); the BN bond distances vary from 1.53(2) to 1.62(1) Å (weighted average 1.58(1) Å). We report and discuss also the 113Cd NMR solution data of several cadmium poly(pyrazol-1-yl)borates).

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