Crystal Structure and Magnetic Studies of Bis (mu-Dibutylphosphinato) Copper (II).

The structure of CuOPC4H92O2 in the solid state has been determined by three-dimensional single-crystal x-ray techniques. The structure was solved by the heavy-atom technique, and least squares refinement gave an R factor of 0.061. The structure consists of polymeric chains of copper atoms linked by double phosphinate bridges. The coordination around each copper atom can be described as a very flattened tetrahedron. The g tensors for oriented single crystals were determined by ESR and range from 2.07 to 2.41, with the larger value in a direction nearly normal to a mean plane formed by the copper atoms and the ligands. The spin orbit coupling constant suggests considerable mixing of metal and ligand orbitals in this polymer.