Bis(2,4-dioxo-5,5-diphenyl-imidazol-idin-ido-κN)bis-(propane-1,3-diamine-κN,N')cobalt(II).

The complex mol-ecule of the title compound, [Co(C(15)H(11)N(2)O(2))(2)(C(3)H(10)N(2))(2)], has crystallographically imposed inversion symmetry. The Co(II) atom displays a distorted octa-hedral coordination geometry. In the phenytoin anion, the two phenyl rings form dihedral angles of 62.

Bis(ethyl-enediamine-κN,N')bis-(phenytoinato-κN)cobalt(II).

THE TITLE COMPOUND [SYSTEMATIC NAME: bis(2,5-dioxo-4,4-diphenylimidazolidin-1-ido-κN(1))bis(ethylenediamine-κ(2)N,N')cobalt(II)], [Co(C(15)H(11)N(2)O(2))(2)(C(2)H(8)N(2))(2)], has site symmetry . The Co(II) cation is located on an inversion center and coordinated by two phenytoin anions and two ethyl-enediamine ligands in a distorted octa-hedral geometry. In the phenytoin anion, the two phenyl rings are twisted with respect to the central hydantoin ring, making dihedral angles of 77.

Bis(5,5-diphenyl-hydantoinato-κN)(ethyl-enediamine)zinc(II).

In the title compound, [Zn(C(15)H(11)N(2)O(2))(2)(C(2)H(8)N(2))], the Zn(II) atom is coordinated in a distorted tetra-hedral geometry. Intra-molecular N-H⋯O, C-H⋯O and C-H⋯N hydrogen bonds occur. In the crystal, mol-ecules are linked by inter-molecular N-H⋯O hydrogen bonds, forming a three-dimensional network.

trans-Bis(5,5-diphenyl-hydantoinato-κN)bis-(propane-1,2-diamine-κN,N')nickel(II).

The asymmetric unit of the title complex, [Ni(pht)(2)(pn)(2)] (pht is 5,5-diphenyl-hydantoinate and pn is propane-1,2-diamine) or [Ni(C(15)H(11)N(2)O(2))(2)(C(3)H(10)N(2))(2)], contains one-half [Ni(pht)(2)(pn)(2)] mol-ecule. The Ni(II) atom is situated on a crystallographic center of inversion and shows a distorted octa-hedral coordination geometry. A three-dimensional network structure is assembled by inter- and intra-molecular N-H⋯O=C inter-actions.