63 Cu NQR and Structural Studies of Complexes Formed Between Cu(I) Halides and tris(o-methoxyphenyl)- or tris(p-tolyl)phosphine Ligands

The crystal structure of [tri(o-methoxyphenvl)phosphine] 2 Cu 2 Br 2 shows it to be a halogen-bridged dimer with three-coordinated Cu (I) sites. The 63 Cu NQR frequency of the corresponding chloride indicates that it has a similar structure. The 63 Cu NQR frequencies of the complexes of tri(p-tolyl)phosphine, L 3 Cu 2 X 2 , with cuprous chloride and bromide are consistent with their having halogen-bridged structures with both three- and four-coordinated Cu(I) sites analogous to those formed by triphenyl-phosphine and tri(m-tolyl)phosphine. Cu(I) sites. [CuBr(P(C 7 H 7 O) 3 ] 2 ; Triclinic, P l̄, Z=2, a = 8.969(1), b= 10.510(2), c=l 1.428(2) Å, α=99.46(l), β=91.95(\), γ= 104.17(1)°, R=3.5%, R ω =2.2% .