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• W1963912171 abstract "The reaction of cyclohexylphosphonic acid (C6H11PO3H2), anhydrous CuCl2 and 2,2′-bipyridine (bpy) in the presence of triethylamine followed by a metathesis reaction with KNO3 afforded [Cu4(µ-Cl)2(µ3-C6H11PO3)2(bpy)4](NO3)2 (1). In an analogous reaction involving Cu(OAc)2·H2O, the complex [Cu4(µ-CH3COO)2(µ3-C6H11PO3)2(2,2′-bpy)4](CH3COO)2 (2) has been isolated. The three-component reaction involving Cu(NO3)2·3H2O, cyclohexylphosphonic acid and 2,2′-bipyridine in the presence of triethylamine afforded the tetranuclear assembly [Cu4(µ-OH)(µ3-C6H11PO3)2(2,2′-bpy)4 (H2O)2](NO3)3 (3). Replacing 2,2′-bipyridine with 1,10-phenanthroline (phen) in the above reaction resulted in [Cu4(µ-OH)(µ3-C6H11PO3)2(phen)4(H2O)2](NO3)3 (4). In all the copper(II) phosphonates (1–4) the two phosphonate ions bridge the four copper(II) ions in a capping coordination action. Each phosphonate ion bridges four copper(II) ions in a µ4, η3 coordination mode or 4.211 of the Harris notation. Variable-temperature magnetic studies on 1–4 reveal that all four complexes exhibit moderately strong intramolecular antiferromagnetic coupling. The DNA cleavage activity of complexes 1–4 is also described. Compounds 1 and 3 were able to completely convert the supercoiled pBR322 DNA form I to nick form II without any co-oxidant. In contrast, 50% conversion occurred with 2 and 40% with 4. In the presence of magnesium monoperoxyphthalate all four compounds achieved rapid conversion of form I to form II." @default.
• W1963912171 created "2016-06-24" @default.
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• W1963912171 date "2008-01-01" @default.
• W1963912171 modified "2023-10-16" @default.
• W1963912171 title "Synthesis, structure, magnetism and nuclease activity of tetranuclear copper(ii) phosphonates containing ancillary 2,2′-bipyridine or 1,10-phenanthroline ligands" @default.
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• W1963912171 doi "https://doi.org/10.1039/b712876b" @default.
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