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- W2012104470 abstract "[((−)-Sparteine)(PhCO2)(Cl)]Cu(II) 1 complex is obtained by direct synthesis using copper(0). 1 crystallizes in the monoclinic space group P21 with a=14.7355(12), b=8.9768(5), c=17.2810(10)Å, β=111.916(5)°, and Z=4. The electronic spectrum of 1 shows a broad band with λmax∼841nm (ε=0.261mM−1cm−6) characteristic of a low symmetry and tetragonally distorted square pyramidal local Cu geometry. The far IR spectrum of 1 shows characteristic vibrations of Cu–Cl (260, 267 cm−1), Cu–N (436, 467 cm−1) and Cu–O (457 cm−1) bonds. The 1H NMR spectrum of 1 is typical of magnetic Cu(II) complexes with line broadening due to efficient nuclear relaxation from the metal center. ESR spectra of polycrystalline 1 at 77 K show an axial spectrum with linewidth of 58.6 G and at 300 K of 89.0 G, with areas in the ratio A77/A300=2.79, indicative of antiferromagnetic order. The linewidth is reduced by 34% on going from 300 to 77 K. Standard magnetization measurements at low temperatures show an Curie–Weiss behavior with θ=−21.67K, suggesting a weak exchange coupling interaction. The crystalline structure of 1 shows that the lattice is arranged so that the space between molecules is smaller than 40 Å3, not enough to accommodate solvent molecules. However, the shortest Cu–Cu contact is 7.5912(8) Å." @default.
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- W2012104470 date "2003-09-01" @default.
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- W2012104470 title "Synthesis, crystal structure, weak antiferromagnetic behavior and electronic studies of novel [((−)-sparteine)(PhCO2)(Cl)]Cu(II) complex" @default.
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- W2012104470 doi "https://doi.org/10.1016/s0022-2860(03)00413-7" @default.
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