[BIS(3-AMINOPROPYL)AMINE-N,N',N'']-[GLYCYLGLYCINATO(2)-N,N',O]-CHROMIUM(III) PERCHLORATE MONOHYDRATE, [CR(C4H6N2O3)(C6H17N3)]CLO4-CENTER-DOT-H2O

The mixed-ligand complex [Cr(dpt)(Gly-Gly)]ClO4.H2O [where dpt = bis(3-aminopropyl)amine and H(2)Gly-Gly = glycylglycine] adopts a structure in which the ligands are tridentate and coordinate meridionally. The four amine N atoms, the carboxyl O atom and the peptide N atom produce a distorted octahedral coordination geometry around the Cr atom. The [Cr(C4H6N2O3)(C6H17N3)](+) cation is linked to the perchlorate group by two hydrogen bonds, O(W)... O(2) [2.746(8) Angstrom] and O(W)... O(4) [2.981 (10) Angstrom], which help to stabilize the crystal structure. The Cr-N bond to the peptide N atom is shorter than those to the amine N atoms, which suggests that the peptide N atom bonds more strongly with chromium(III) than normal N atoms.