Abstract
Treatment of Li[PhBH3] with excess 3-(C2F5)PzH led to the B-phenylated tris(pyrazolyl)borate ligand as its lithium salt [PhB(3-(C2F5)Pz)3]Li. This ligand enabled the isolation of thermally stable group 11 metal ethylene adducts [PhB(3-(C2F5)Pz)3]M(C2H4) (M = Au, Ag, Cu). They were characterized by spectroscopy and by X-ray crystallography. These ethylene adducts are structurally similar and feature three-coordinate trigonal-planar metal sites and a κ2-bonded tris(pyrazolyl)borate ligand. They are ideal for examining the trends involving ethylene complexes of the group 11 triad. The ethylene 13C NMR resonance of the [PhB(3-(C2F5)Pz)3]M(C2H4) adducts in C6D12 appear at δ 58.9, 101.6, and 85.5 ppm, respectively, for M = Au, Ag, Cu. The M–C and M–N bond distances are largest in the silver complex and smallest in the copper complex.
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