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Darstellung sowie Kristall- und Molekülstruktur von Triphenylphosphinoxidhydrogenfluorid, (C6H5)3PO · HF

Preparation, Crystal and Molecular Structure of Triphenylphosphineoxide Hydrogen - fluoride (C₆H₅)₃PO · HF (C₆H₅)₃PO · HF was prepared from hydrofluoric acid (40%) and (C₆H₅)₃PO in benzene. It crystallizes in the monoclinic space group P2₁/c with a = 1 032.8(3), b = 1 051.0(7), c = 1695.5(2) pm, β = 121.95(2)° and Z = 4; d (calc./obs.) 1.27/1.26 g ° cm^?3. The structure was determined by direct methods from 2 709 independent reflections and has been refined by full matrix least squares methods to R = 0.049. In the compound HF and (C₆H₅)₃PO are linked by a short H-bond. Some distances: O? F 238.4(5), O? H 142.3, H? F 99.8, P? O 149.5(4) pm. Angle O? H? F 159.8°.     

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Darstellung sowie Kristall- und Molekülstruktur von 2 (C6H5)3PO · (COOH)2

Preparation, Crystal and Molecular Structure of 2 (C₆H₅)₃PO · (COOH)₂ 2(C₆H₅)₃PO · (COOH)₂ crystallizes from a solution of oxalic acid and (C₆H₅)₃PO in methanol. Crystal data: space group P2₁/c (monoclinic) with a = 907.4(2), b = 1035.4(3), c = 1797.9(8) pm, β = 75.20(1)° and Z = 2; d (calc./obs.) = 1.27/1.31 g cm^?;3; V_cell = 1633.1 × 10⁶ pm³. The structure was determined by direct methods from 3006 independent reflections and has been refined by full matrix least squares to R = 0.049. In the compound one molecule of trans-oxalic acid and two symmetrically dependent (C₆H₅)₃PO units are linked by short O…?H–O bridges distances and angles see above.