Divalent Lanthanide Phosphides. Synthesis and X-ray Crystal Structure Determination of Yb[PPh₂]₂ (N-Melm)₄: The Missing Link¹

References

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• Crystal data for 2 (C40H44N8P2Yb): Mr = 871.81 monoclinic, space group P21/n with a = 9.881 (1) Å, b = 17.717 (2) Å, c = 11.153 (2) Å, β = 95.61 (1)°, V = 1943.1 (5) Å3, ρ = 1.490g cm−3, Z = 2, F(000) = 880, μ(Mo-Kα) = 25.28 cm−1; Enraf Nonius CAD4 diffractometer. The structure was solved by direct methods. Data were corrected for Lorentz and polarization effects as well as for absorption (DIFABS). Data collected at 217K with Mo-Kα (λ = 0.71069 Å). From 4402 measured [(sin Θ/λ)max = 0.64 Å−1] and 4396 unique reflections, 3435 were considered “observed” [F0 > 4 σ(F0)] and used for refinement. All non-H atoms were refined with anisotropic displacement parameters. All H-atoms were calculated and allowed to ride on their corresponding carbon atom with fixed isotropic contributions (Uiso(fix) = 0.08 Å2). The structure converged for 232 refined parameters to an R 1 (wR2) value of 0.0201 (0.0469). The function minimized was [Σw(F2 0 – F2 0)2]/Σ[w(F2 0)2]1/2, w = q/σ2(F2 0) + (ap)2 + bp, p = max(F2 0, o) + 2F2 0/3 a = 0.0243, b = 1.31. Residual electron densities: + 0.278/ − 0.562eÅ−3
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