Poly(1,2,3-benzotriazolyl)borate complexes with copper(I) and tri-organophosphane: an unprecedented κ1-coordination of [H2B(btz)2] (btz=1,2,3-benzotriazolyl) 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 (1H and 31P{1H}) 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 of 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-tolyl3)n{(btz)3BH}] with a four coordinate PCuN3 coordination sphere with the tris(benzotriazolyl)borate acting as tripodal donor throughout all its N2 atoms.