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- W2073681231 abstract "The synthesis, crystal structure and magnetic properties of four new copper(II) carboxylate complexes with pyridyl-substituted nitronyl nitroxides, [Cu2(μ-ClCH2CO2)2(ClCH2CO2)2(NITpPy)2(H2O)2]CH3OH (1), [Cu(Cl2CHCO2)2(NITpPy)2(H2O)] (2), [Cu(Cl3CCO2)2(NITpPy)2(H2O)] (3) and [Cu(Cl2CHCO2)2(NITmPy)2(H2O)2] (4) (NITpPy=4,4,5,5-tetramethyl-2-(4-pyridyl)-2-imidazoline-N1-oxy N3-oxide, NITmPy=4,4,5,5-tetramethyl-2-(3-pyridyl)-2-imidazoline-N1-oxy N3-oxide) are reported. Complex 1 has a dimeric structure where two copper ions are doubly bridged by four oxygen atoms from two μ-ClCH2CO2 − ions. Complexes 2 and 3 are mononuclear, the copper(II) ion has five coordination with square-pyramidal symmetry. In complex 4, the copper(II) ion has distorted-octahedral six coordination. Temperature dependence studies of the χmT values of complexes 1–4 revealed that 1 exhibits a strong intramolecular metal–metal antiferromagnetic interaction and a weak intramolecular metal–nitroxide antiferromagnetic coupling, 2 and 3 exhibit a weak intramolecular metal–nitroxide antiferromagnetic coupling, while 4 possesses weak ferromagnetic exchange interactions between metal and NITmPy. A simple spin polarization model has been used to justify the observed magnetic exchange interactions between Cu(II) and radical ligands." @default.
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- W2073681231 date "2001-12-01" @default.
- W2073681231 modified "2023-09-23" @default.
- W2073681231 title "Structure and magnetic properties of copper(II) carboxylate with pyridyl-substituted nitronyl nitroxides" @default.
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- W2073681231 doi "https://doi.org/10.1016/s0277-5387(01)00917-2" @default.
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