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- W1970610416 abstract "Two novel ladder-like copper(II) compounds, [Cu2(histamine)2(C2O4)(ClO4)2] (1) and [Cu2(histamine)2(C2O4)(H2O)2(NO3)2] (2), are prepared. Compound 1 crystallizes in the triclinic space group P1, with a=7.450(4) Å, b=7.519(7) Å, c=9.646(5) Å, α=85.78(7)°, β=88.60(4)°, γ=76.78(7)°, V=524.5(6) Å3, and Z=1 with R=0.0789 (all data). In 1, the dinuclear units of [Cu2(histamine)2(C2O4)]2+ are linked together by the perchlorate anions to form a ladder-like chain. The chains interact each other by the π–π stacking interactions via the imidazole groups. Compound 2 crystallizes in the triclinic space group P1, with a=7.579(2) Å, b=8.133(1) Å, c=9.161(3) Å, α=77.06(2)°, β=89.23(2)°, γ=82.54(1)°, V=545.6(2) Å3, and Z=1 with R=0.0751 (all data). In 2, each dinuclear unit [Cu2(histamine)2(C2O4)]2+ is coordinated with a nitrate anion and a water molecule, and they are held together by the hydrogen bonding interactions to form a ladder-like chain. The magnetic susceptibility data of 1 and 2 measured in 2–300 K provide the magnetic parameters, g=2.08, J=−166 cm−1, J′=6.46 cm−1, ρ=0.0026, Nα=155×10−6 cm3 mol−1, and R=1.03×10−3 (g=2.05, J=−162 cm−1, J′=10.5 cm−1, ρ=0.0029, and R=2.95×10−3 with the fixed value of Nα=120×10−6 cm3 mol−1) for 1 and g=2.00, J=−158 cm−1, J′=26.5 cm−1, ρ=0.0020, Nα=136×10−6 cm3 mol−1, and R=7.31×10−4 (g=2.01, J=−157 cm−1, J′=25.0 cm−1, ρ=0.0021, and R=1.32×10−3 with the fixed value of Nα=120×10−6 cm3 mol−1) for 2. These indicate that very strong antiferromagnetic interactions occur along the rungs of the ladder via the oxalate bridge and weak ferromagnetic interactions along the chains." @default.
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- W1970610416 date "2000-06-01" @default.
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- W1970610416 title "Self-Assembly, Structures, and Magnetic Properties of Ladder-Like Copper(II) Coordination Polymers" @default.
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- W1970610416 doi "https://doi.org/10.1006/jssc.2000.8682" @default.
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