Poly(1,2,3-benzotriazolyl)borate complexes with copper(I) and tri-organophosphane: an unprecedented kappa(1)-coordination of [H2B(btz)(2)] (btz=1,2,3-benzotrizaolyl) in the X-ray crystal structure of [Cu(PBn3)(2){(btz)BH2(btz)}]

New copper(I) triorganophosphane derivatives [Cu(PR3)(n){H2B(btz)(2)}] and [Cu(PR3)(n){HB(btz)(3)}] (n=1 or 2) have been synthesized from the reaction of CuCl with PR3 (R = phenyl, cyclohexyl, benzyl, o-, m-, or p-tolyl) or PMePh2 and potassium dihydrobis(1,2,3-benzotriazolyl)borate K[H2B(btz)(2)] or potassium hydrotris(1,2,3-benzotriazolyl)borate K[HB(btz)(3)]. The complexes obtained have been characterized by elemental analyses and FT-IR in the solid state and by NMR (H-1 and P-31{H-1}) spectroscopy and conductivity measurements in solution. Solution data are consistent with partial dissociation of complexes occurring throughout breaking of the Cu-P bond. Single crystal structural characterizations were undertaken for two or them. The structurally authenticated arrays are, (a) [Cu(PBn3)(2){(btz)BH2(btz)}] with a three coordinate P2Cu(N) coordination sphere and the donor [H2B(btz)(2)] coordinated throughout only one N3 atom. (b) [Cu(P-m-tolyl(3))(n){(btz)(3)BH}] with a four coordinate PCuN3 coordination sphere with the tris(benzotriazolyl)borate acting as tripodal donor throughout all its N2 atoms.