Crystal structure of silver [(propane-1,3-diyl-dinitrilo-κ 2 N , N ')-tetra-acetato-κ 4 O , O ', O '', O ''']chromate(III) from synchrotron X-ray data

The asymmetric unit of the title compound, Ag[Cr(C H N O )]·3H O, contains one [Cr(1,3-pdta)] anion [1,3-pdta is (propane-1,3-diyldi-nitrilo)-tetra-acetate], one Ag cation and three water mol-ecules. The Cr ion is coordinated to the four O and two N atoms of the 1,3-pdta ligand, displaying a distorted octa-hedral geometry. The mean Cr-N and Cr-O bond lengths are 2.0727 (17) and 1.9608 (15) Å, respectively. The conformations of the chelate rings were found to be envelope for the glycinates and twist-boat for the six-membered di-amine ( ) ring. The Ag cation is surrounded by six O atoms from three non-coordinated carbonyl O atoms of neighbouring 1,3-pdta groups and three water mol-ecules. The crystal structure is stabilized by inter-molecular hydrogen bonding involving the water O-H group as donor and the carboxyl O atom as acceptor.