Crystal structures of meso-ortho-phenylenebis(methylphenylphosphine) and its monoprotonated tetrafluoroborate salt

Abstract

The crystal structures of the title compounds, C₆H₄(PMePh)₂(1) and [C₆H₄(PMePhH)(PMePh)][BF₄](2), have been determined by single-crystal X-ray diffraction methods at 295 K and refined by least squares to residuals of 0.044(1)(1 726 ‘observed’ reflections) and 0.045(2)(1 755). Crystals of (1) are monoclinic, space group P2₁/n, with a 14.604(8), b 10.181(6), c 12.868(9)Å, β 110.94(5)°, and Z= 4; those of (2) are triclinic, P, with a 12.594(5), b 9.988(4), c 8.643(4)Å, α 81.69(3), β 87.62(3), γ 70.85(3)° and Z= 2. In (1), 〈P–C〉 is 1.83₉Å and 〈C–P–C〉 100_·7°; in (2), the corresponding values about one of the phosphorus atoms are 1.83₅Å and 102_·2°, but about the other, 1.78₉Å and 110_·0°, and it is tentatively proposed that the proton is bonded to the latter. The anion in (2) is disordered.