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• W1982203429 abstract "The molecular structure of the compound Cu2F2(DMPZ)2(MPZ)4(BF4)2 (DPZ = 3,5-dimethylpyrazole; MPZ = 5-methylpyrazole), determined by single-crystal X-ray analysis, is described. The compound was obtained via partial substitution of DMPZ ligands in Cu2F2-(DMPZ)6(BF4)2. The compound crystallizes in space group P1, with a = 9.578(2) Å, b = 9.893(1) Å, c = 10.994(2) Å, α = 104.27(1)°, β = 109.04(2)°, γ = 99.12(1)° and Z = 1. Reflection data were collected using an Enraf-Nonius CAD-4 single-crystal diffractometer and graphite-monochromated Mo-Kα radiation. The structure was solved using conventional Patterson, Fourier and least-squares refinement techniques. The final conventional discrepancy index (R) was 4.1%, based on 4442 independent reflections. The compound is dimeric, having asymmetric fluoro bridges (CuF: 1.904(2) and 2.258(2) Å) with a CuFCu angle of 97.19(8)° and a Cu–Cu distance of 3.131(1) Å. The copper atom is in a square-based pyramidal coordination geometry with one fluoride ion in apical position. Strong HF interactions were observed between the NH protons of the substituted pyrazole ligands and the bridging fluoride ion as well as with one or two of the fluorides of the BF4− anion. The BF4− anion is present in two different orientations having one BF bond in common, i.e. they are related by a rotation around this BF bond. Magnetic susceptibility measurements down to 2 K and EPR spectroscopy showed the existence of weak super-exchange interactions (|J| < 0.4 cm−1). These results are discussed in relation to the available structural information." @default.
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• W1982203429 date "2010-09-02" @default.
• W1982203429 modified "2023-09-27" @default.
• W1982203429 title "Synthesis, structure and magnetism of di-μ2-fluorobis(3,5-dimethylpyrazole)tetrakis(5-methylpyrazole)dicopper(II) bis(tetrafluoroborate)" @default.
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• W1982203429 doi "https://doi.org/10.1002/recl.19811001103" @default.
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