Copper-63,65 nuclear quadrupole resonance of complexes of copper(I) halides with phosphorus-containing ligands

Abstract

The ⁶³Cu NQR spectra have been recorded for ten complexes of Cu¹ with phosphine and halide ligands that, either on the basis of their previously determined crystal structures or of their analogy to complexes of known structure, were believed to contain three-co-ordinated copper atoms. The NQR resonance frequencies support these attributions and the structure determination of two of the complexes, [{CuX(L)}₂][X = Cl or Br, L = P(C₆H₄Me-o)₃], confirms the co-ordination number of three. The NQR results indicated that the previously reported structure for [Cu₄Br₄(Ph₂PCH₂PPh₂)₂] was incorrect and a redetermination of the structure confirmed this conclusion.