%0 Journal Article %A Hall, SR %A Skelton, BW %A White, AH %T Structural studies in the ruthenium(II)/(±)-ortho-Phenylenebis{methyl(phenyl)-phosphine/arsine) system. II. Crystal structure of trans-Dichloro[(±)-ortho-phenylenebis{methyl(phenyl)-phosphine}][(±)-ortho-phenylenebis(methyl(pheny1)-phosphine) P-oxide]ruthenium(II) %J Australian Journal of Chemistry %D 1983/02/01 %V 36 %N 2 %P 267-270 %K %R https://doi.org/10.1071/CH9830267 %U https://www.publish.csiro.au/paper/CH9830267 %X The crystal and molecular structure of the title complex, trans-[RuCl2{(±)-o-C5H4(PMePh)2}{(±)- o-C5H4(PMePh)(P(O)MePh)}], has been established by a single-crystal X-ray diffraction study at 295(1) K, being refined to a residual of 0.037 for 2669 independent 'observed' reflections. Crystals are orthorhombic, P212121, a 16.655(5), b 15.805(4), c 14.823(8) Å, Z 4. The chlorine atoms lie trans to each other in the coordination sphere of the six-coordinate ruthenium, with the O-C6H4(PMePh)2 and o-C6H4(PMePh)(P(O)MePh) ligands being P,P? and O,P' bidentate respectively. The ruthenium-chlorine distances are 2.434(2) and 2.425(2) Å; the two mutually trans ruthenium- phosphine distances are 2.310(3) and 2.346(2) Å, but that which is trans to the oxygen is unusually short, being 2 219(2) Å. The ruthenium-oxygen distance is 2.166(5)Å.