Crystal structures of two isostructural bivalent metal N-benzoylglycinates

Abstract

The crystal structures of two coordination compounds of N-benzoylglycine, viz. catena-poly[[[diaquabis(N-benzoylglycinato)cobalt(II)]-mu-aqua] dihydrate], {[Co(C sub(9)H sub(8) NO sub(3)) sub(2)(H sub(2)O) sub(3)].2H sub(2) O} sub(n,) 1, and catena-poly[[[diaquabis(N-benzoylglycinato)nickel(II)]-mu-aqua] dihydrate], {[Ni(C sub(9) H sub(8) NO sub(3)) sub(2)(H sub(2)O) sub(3)].2H sub(2) O} sub(n,) 2, are described. The structures of 1 and 2 were reported previously [Morelock et al. (1979). J. Am. Chem. Soc. 101, 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 octahedral geometry. A pair of terminal aqua ligands disposed trans to each other and a pair of monodentate N-benzoylglycinate ligands form the square base and account for four of the six vertices of the octahedron. A mu sub(2-) bridging aqua ligand links the bivalent metals into one-dimensional chains extending along the c-axis direction. The one-dimensional chains stabilized by O-H...O hydrogen bonds are interlinked by N-H...O and C-H...O hydrogen-bonding interactions.