Crystal structure of silver [(propane-1,3-diyldinitrilo-κ2N,N′)tetraacetato-κ4O,O′,O′′,O′′′]chromate(III) from synchrotron X-ray data

Abstract

The asymmetric unit of the title compound, Ag[Cr(C11H14N2O8)]·3H2O, contains one [Cr(1,3-pdta)]− anion [1,3-pdta is (propane-1,3-diyldinitrilo)tetraacetate], one Ag+ cation and three water molecules. The Cr3+ ion is coordinated to the four O and two N atoms of the 1,3-pdta ligand, displaying a distorted octahedral 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 diamine (T) 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 molecules. The crystal structure is stabilized by intermolecular hydrogen bonding involving the water O—H group as donor and the carboxyl O atom as acceptor.

Keywords

• crystal structure
• propane-1,3-diyldinitrilotetraacetate
• silver cation
• chromate(III) complex
• twist-boat conformer