Evidence for Cu⋯H Interactions in Dinuclear Cu(I) Complexes of Hindered Hydrotris (pyrazolyl) Borate Ligands
The structures of the synthetically useful Cu(I) compounds [Tpt-Bu,MeCuI]2·0.5toluene (1) (C51.5H84B2Cu2N12, a=13.2425(2), b=13.9201(2), c=17.6033(3) Å, α=105.137(1), β=106.730(1), γ=103.548(1)°, V=2826.73(8) Å3, triclinic, P1̄, Z=2) (TpR,R′= [HB(3-R,5-R′pz)3]; pz=pyrazolyl) and [Tpt-Bu,i-PrCuI]2 (2) (C60H104B2Cu2N12, a=23.3168(2), b=14.3594(2), c=20.2819(2) Å, β=99.05(1)°, V=6706.2(1) Å3, monoclinic, P21/c, z=4) have been examined by X-ray analysis as well as by IR and NMR to reveal a complex pattern of B-H⋯Cu interactions that persist in solution. As opposed to the structures of the pseudo-tetrahedral carbonyl adducts [Tpt-Bu,MeCu(CO)] (3) (C25H40BCuN6O, a=15.502(4), b=9.681(2), c=19.049(6) Å, β=95.94(2)°, V=2843(1) Å3, monoclinic, Pc, Z=4) and [Tpt-Bu,i-PrCu(CO)] (4), the structures of 1 and 2 display an “inverted” configuration at the boron atom that directs the B-H units towards the dicopper(I) core at a position suitable for a three-center, two-electron B-H⋯Cu bonding interaction. © 1997 Elsevier Science S.A.
S. Kiani et al., "Evidence for Cu⋯H Interactions in Dinuclear Cu(I) Complexes of Hindered Hydrotris (pyrazolyl) Borate Ligands," Inorganica Chimica Acta, Elsevier, Jan 1997.
The definitive version is available at http://dx.doi.org/10.1016/S0020-1693(97)05665-X
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