The first coordination compound of 1,4-dihydro-2,3-quinoxalinedione in ketoamine tautomeric form (denoted as H 2 qdione) was reported. H 2 qdione was obtained by a solid-state reaction of o-phenylenediamine and oxalic acid. Reaction of this ligand with CdCl 2 solvothermally yielded a coordination polymer [Cd(H 2 qdione)Cl 2 ] n , which was structurally characterized by X-ray diffraction and IR spectros-
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