STRUCTURE OF THE 1/1 COMPLEX FORMED BY TRIPHENYLPHOSPHINE OXIDE AND 4-NITROPHENOL

C18H15OP.C6H5NO3, M(r) = 417.38, triclinic, P1BAR, a = 8.633 (1), b = 9.966 (2), c = 13.317 (4) angstrom, alpha = 92.01 (2), beta = 102.90 (2), gamma = 106.25 (1)-degrees, V = 1066.4 (5) angstrom3, Z = 2, D(m) = 1.29, D(x) = 1.300 Mg m-3, lambda(Mo Kalpha) = 0.71073 angstrom, mu = 0.15 mm-1, F(000) 436, T = 295 K, R = 0.0489 for 1760 observed reflections. The P-O group of the triphenylphosphine oxide molecule is hydrogen bonded to the hydroxyl group of the 4-nitrophenol molecule with an O...O distance of 2.630 (4) angstrom. The packing of the system is such that the 4-nitrophenol molecules are distributed in layers having ab as the mean plane, alternating with layers of triphenylphosphine oxide molecules. In the latter layers, the P-O groups belonging to centrosymmetrically related triphenylphosphine oxide molecules point alternately up and down and make hydrogen bonds with 4-nitrophenol molecules belonging to consecutive layers.