Macrocyclic polyphosphane ligands: cobalt(II) and nickel(II) complexes of 1,10-dipropyl-4RS, 7SR, 13SR, 16RS-tetraphenyl-1,10-diaza-4,7,13,16-tetraphospha-cyclooctadecane and crystal structure of the cobalt tetraphenylborate monohydrate complex

The X-ray crystal structure of the title compound has been carried out. The crystals are triclinic, space group P1, a = 13.252(2), b = 13.943(2), c = 24.316(5) Å, α = 70.660(14), β = 75.219(14), γ = 69.231(13)° for Z = 2. The structure has been refined to an R factor of 0.069 by the least-squares technique. The cobalt atom is five-coordinated by the four phosphorus atoms of the macrocycle and by a water molecule forming a distorted square-pyramidal geometry. The stereochemistry of some cobalt(II) and nickel(II) complexes of the same ligand were investigated, in the solid state and in solution, by electronic spectroscopy. © 1984.