title: [catena-Poly[[[(N,N,N',N'-tetramethylethylenediamine)copper(II)]-mu-oxalato] tetrahydrate]].
abstract: In the title compound, {[Cu(C2O4)(C6H16N2)].4H2O}n, the Cu atom is six-coordinate in a distorted octahedral geometry, and N,N,N',N'-tetramethylethylenediamine acts as a chelating ligand. The oxalate anion, which lies about an inversion centre, bridges the metal cations and forms infinite chains. The structure cohesion is ensured by hydrogen-bonding interactions, which form a three-dimensional framework.
authors.affiliation: Laboratoire de Matériaux et Cristallochimie, Faculté des Sciences de Tunis, Université de Tunis El Manar II, 2092 Tunis, Tunisia.
authors.forename: Jedidi
authors.initials: J
authors.lastname: Ferjani
authors.forename: Mohsen
authors.initials: M
authors.lastname: Graia
authors.forename: Tahar
authors.initials: T
authors.lastname: Jouini