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• W2068262015 abstract "Abstract The crystal structures of two copper(II) complexes containing the ligand di-2-pyridylamine (dpyam) with monovalent H2PO4 − and divalent HPO4 2− oxoanions, [Cu(dpyam)(μ-H2PO4-O,O′)(H2PO4)]2 (1) and [Cu(dpyam)(μ3-HPO4-O,O′,O″)]n (2), are reported and determined by X-ray crystallography. The dinuclear Cu(II) complex 1 was obtained by the reaction of dpyam with Cu(NO3)2 · 3H2O and KH2PO4 in a water–ethanol (45/55) mixture. The molecules are linked into dinuclear units by two bridging didentate dihydrogenphosphate groups (endo/exo) in an equatorial–equatorial configuration giving a slightly distorted square pyramidal stereochemistry. The Cu–Cu contact distance of 5.136(2) A is unusually large due to the exo/endo binding of the phosphate bridges. Complex 2 is a polymeric copper(II) derivative with helical [Cu(HPO4)]3 units surrounded by dpyam ligands and stabilized by intermolecular hydrogen bonds. Two nearest Cu(II) ions are bridged by a tridentate hydrogenphosphate group which is didentately coordinated to one copper(II) ion, and monodentately coordinated to another in an equatorial–equatorial configuration in an unusual bridging coordination mode. Each copper(II) ion in 2 exhibits a tetrahedrally distorted square-based geometry with the third oxygen atom (Cu–O=2.719(3) A), from the hydrogenphosphate group weakly bound in an approximately axial position giving an extremely tetrahedrally distorted square-based pyramidal CuN2O2O′ chromophore. The magnetic susceptibility measurements (5–300 K) reveals an antiferromagnetic interaction with J values of −2.85(1) and −26.20(2) cm−1 for complexes 1 and 2, respectively. Some magneto-structural trends are discussed, along with their EPR and electronic reflectance spectra and compared with those of related complexes." @default.
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• W2068262015 date "2004-09-01" @default.
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• W2068262015 title "The coordination chemistry of mono(di-2-pyridylamine) copper(II) complexes with monovalent and divalent oxoanions: crystal structure, spectroscopic and magnetic properties of dinuclear [Cu(L)(μ-H2PO4)(H2PO4)]2 and polynuclear [Cu(L)(μ3-HPO4)]n" @default.
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• W2068262015 doi "https://doi.org/10.1016/j.ica.2004.04.027" @default.
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