Publications [#233512] of Andrew T. McPhail

Journal Articles

  1. Gahan, B; Garner, CD; Hill, LH; Mabbs, FE; Hargrave, KD; McPhail, AT, "Crystal Structure of, and Solution Adduct Equilibria Involving, Tetraphenyl-arsonium Tetrachloro-oxochromate(V)", J. Chem. Soc. Dalton, 1977(18), 1726-1729, Royal Society of Chemistry (RSC) [Gateway.cgi], [doi].
    (last updated on 2026/01/21)

    Abstract:
    Crystals of the title complex are tetragonal, space group P4/n, with a = 12.590(7), c = 7.840(5) Å, and Z = 2. The crystal structure has been solved by the heavy-atom method and refined by full-matrix least-squares calculations to R 0.059 over 860 statistically signrfrcant reflections from diffractometer measurements (Cu-Kα radiation). The square-pyramidal [CrCl4O]- anion has crystallographic 4mm(C4v) symmetry with Cr-O 1.519(12) and Cr-Cl 2.240(3) Å, and O-Cr-Cl 104.5(1)°. The [AsPh4]+ cation has crystallographic 4̄(S4) symmetry [As-C 1.906(6) Å C-As-C 105.3(3) and 111.5(3)°]. E.s r. spectroscopy has been used to estimate the equilibrium constants for the reaction [CrCl4O]-+ L ⇄K [CrCl4OL]n- in CH2Cl2solution {n = 1 when L = PPh3O (K = 3 ± 2), P(NMe2)3O (K = 463 ± 130), thf (K < 1), or py (K = 160); n = 2 when L = Cl- (K = 43 ± 10 with [AsPh4]Cl and 250 ± 33 dm3 mol-1 with [NEt4]Cl)}.