Abstract
The new ligand tris(2-diethylphosphinoethyl)amine, N(CH 2CH 2P(C 2H 5) 2) 3, Etnp 3, has been synthesized. It forms with cobalt(II) and nickel(II) salts different types of complexes depending on the reaction conditions. The crystal and molecular structure of the [Ni 3(Etnp 3) 2Cl 4 (BPH 4) 2 complex has been determined by standard X-ray methods, and refined to R = 0.079. The crystals are monoclinic, space group P2 1/n. The unit cell dimensions are: a = 20.067(5), b = 17.555(5), c = 12.652(4) Å, β = 95.36(9)°, Z = 4. The structure of the complex cation consists of three four-coordinated nickel atoms with square planar geometry. Two Etnp 3 ligands cement together these three metal centers. Chlorine atoms also enter in the coordination sphere of each nickel atom.
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