DIAMMINEBIS(5,5-DIPHENYLHYDANTOINATO)ZINC(II) HEMIHYDRATE

In the title compound, 5,5-diphenyl-2,4-imidazolidinedionato-N-3)zinc( II) hemihydrate, [Zn(C-15-H11N2O2)(2)(NH3)(2)].1/2H(2)O, the zinc(II) ion coordinates with two deprotonated hydantoin and two ammine ligands in a 4-N tetrahedral arrangement. The complex has C-s symmetry with t he Zn cation and the two ammonia N atoms located in the symmetry plane . Geometric changes in the hydantoin ring compared with free phenytoin show the effect of the Zn coordination. The arrangement of phenyl rin gs in this complex is different from those in free phenytoin and the a nalogous copper and nickel complexes.