Chemistry of the Group 1B Metals. XI. Further Studies of Some Poly(pyrazolyl)-borate Complexes of Copper(I)

Abstract

A series of 21 poly(pyrazolyl)borate complexes of copper(I) have been prepared either (i) from reactions between the appropriate carbonyl derivatives, Cu(CO)[(pz)₃BR](R = H or pz) or Cu(CO)[(Me₂pz)₃-BH], and donor ligands, L, or (ii) from reactions between copper(I) chloride, L, and the appropriate poly(pyrazolyl)borate anion [H₂B(pz)₂-,ph₂B(pz)₃-, HB(pz)₃-, HB(Me₂pz)₃- or B(pz)₄-]. Complexes containing L = CO, PEt₃, P(C₆H₄Me)₃ (C₆H₄Me = o-, m- or p-tolyl), As(C₆H₄Me-p)₃,P(OMe)₃, P(OMe)₃ (OPh)₃, dppm, dppe, diars, MeC(CH₂PPh₂)₃ or Bu^tNC are described. Most contain four-coordinate copper(I), although the bis(pyrazolyl)borate complexes are formally three-coordinate.