Experimental

R factor = 0.021; wR factor = 0.062; data-to-parameter ratio = 15.6. In the crystal structure of the zinc(II) complex of bicine, [Zn(C6H12NO4)2], the deprotonated amino acid O,N,O 0-chelates to the metal atom through a carboxylate O atom, a hydroxy O atom and the N atom, the three atoms occupying fac positions of the distorted octahedron surrounding the metal atom. The metal atom lies on a center of inversion. The uncoordinated carboxylate O atom is hydrogen bonded to the hydroxy groups of adjacent molecules, these two hydrogen bonds leading to the formation of a three-dimensional network. Related literature For the isostructural cobalt(II) analog, see: Zhao & Li