Crystal structure of bis[N,N-bis(2-hydroxyethyl)glycinato-kappa O-3(1),N,O-2]-cobalt(II) monohydrate

The title compound, [Co(C6H12O4)(2)]center dot H2O, was prepared by mild heating of an aqueous solution. The Co-II ion has a slightly distorted octahedral coordination environment which is defined by two N atoms occupying the apical position, while the equatorial plane is furnished by two hydroxy O atoms and two carboxylate O atoms. The four hydroxy O atoms from two distinct N,N-bis(2-hydroxyethyl)glycine (bicH2-) ligands act as hydrogen -bond donors with two carboxylate O atoms as acceptors to form O-H center dot center dot center dot O hydrogen -bonded layers extending parallel to (100). In addition, the guest water molecule acts as both a hydrogen -bond donor and acceptor, so that each Co(bicH(2))(2) molecule is connected simultaneously to six neighbouring Co(bicH(2))(2) and two guest water molecules by hydrogen bonding.