Crystal structures of two isostructural bivalent metal -benzoyl-glycinates.

The crystal structures of two coordination compounds of -benzoyl-glycine, -poly[[[di-aqua-bis-(-benzoyl-glycinato)cobalt(II)]-μ-aqua] dihydrate], {[Co(CHNO)(HO)]·2HO} , , and -poly[[[di-aqua-bis-(-benzoyl-glycinato)nickel(II)]-μ-aqua] dihydrate], {[Ni(CHNO)(HO)]·2HO} , , are described. The structures of and were reported previously [Morelock (1979). , 4858-4866] and redetermined in this work to determine the H-atom coordinates. In the isostructural compounds, the central metal is located on an inversion centre and exhibits a distorted octa-hedral geometry. A pair of terminal aqua ligands disposed to each other and a pair of monodentate -benzoyl-glycinate ligands form the square base and account for four of the six vertices of the octa-hedron. A μ-bridging aqua ligand links the bivalent metals into one-dimensional chains extending along the axis direction. The one-dimensional chains stabilized by O-H⋯O hydrogen bonds are inter-linked by N-H⋯O and C-H⋯O hydrogen-bonding inter-actions.