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Molecular Copper(II) Complexes Derived from Phosphonoacetic Acid: Crystal Structures and Magnetic Behavior



The syntheses, structural characterization, and magnetic behavior of five new copper(II) complexes derived from phosphonoacetic acid, H2O3PCH2CO2H, with the formulae [Cu{(py)2C(OH)2}](HO3PCH2CO2H)2 (1), [Cu2(HO3PCH2CO2)2{(py)2C(OCH3)OH}2] (2), [Cu2(HO3PCH2CO2)2(bpy)2] (3), [Cu4(O3PCH2CO2)2(5-dmbpy)4(H2O)4](NO3)2 (4), and [Cu4(O3PCH2CO2)2(5-dmbpy)4(H2O)4](ClO4)2 (5) are reported. [H2O3PCH2CO2H = phosphonoacetic acid, (py)2C(OH)2 = bis(2-pyridyl)methanediol, {(py)2C(OCH3)OH} = bis(2-pyridyl)methoxymethanol, bpy = 2,2′-dipyridyl, 5-dmbpy = 5,5′-dimethyl-2,2′-dipyridyl, terpy = 2,2′:6′,2″-terpyridine]. Complex 1 is a mononuclear compound with hydrogenphosphonateacetic acid in its monoanionic form, complexes 2 and 3 are dinuclear compounds with hydrogenphosphonoacetate(2–) bridging ligands, and complexes 4 and 5 are tetranuclear compounds with phosphonoacetate(3–) bridging ligands. The magnetic properties of polynuclear complexes 25 are reported.