μ2-Oxalato-bridged tricopper(II) complex derived from 1,4,8,12-tetraazacyclopentadecane: Synthesis, structure and magnetic characterization

Decomposition of allantoin in the presence of Cu(II) ions resulting in the formation of a coordination polymer containing oxalate species

“…Therefore, the point group symmetry of the C 2 O 2À 4 is closed to C 2h . The C-O and C-C distances, 1.241(4) Å, 1.257(4) Å and 1.551(6) Å, are comparable with the respective values of the non-coordinated C 2 O 2À 4 anion, 1.2534(17) Å 1.5740(24) Å, and to those observed in other oxalato-bridged copper(II) complexes [11][12][13][14][15][16][17].Two symmetry dependent DMSO molecules are coordinated monodentatly through the oxygen atom. The interatomic distances and angles are in good agreement with the data for coordinated 1387-7003/$ -see front matter Ó…”

Ammonium tris-oxalatoferrate(III) as a source of metalloligand in direct synthesis of Cu/Fe coordination polymer

“…However, δ(NH 2 ) frequencies of en are obscured by stretching vibrations of the carboxylate groups [7]. Strong absorption bands observed at 1676, 1655, 1409 and 1280 cm − 1 were attributed to the oxalato groups coordinated in a bis-chelating mode [8]. The band observed at 950 cm − 1 is associated with non-coordinated dmso involved in H-bonding [2, b].…”