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Abstract 6-Ethyl-4-hydroxy-2,5-dioxo-5,6-dihydro-2H-pyrano[3,2-c] quinoline-3-carboxaldehyde was synthesized as a ligand and reacted with Cu(II) metal ion with different anions (OAc–, NO3–, SO42–, ClO4–, Cl– and Br–) in absence and presence of auxiliary ligands (L′); N,O-donor; or N,N-donor such as8-hydroxyquinoline, - |