The crystal and molecular
structure of the title complex, cis-[Ru(CO)Cl2(dmso)(opmpp)] (1) (dmso ≡ dimethyl
sulfoxide, Me2SO; opmpp ≡ (�)-ortho-phenylenebis
{methyl(phenyl)phosphine},[o-C6H4(PMePh)2]), has been determined by a
single-crystal X-ray diffraction study at 295(1) K, being refined to a residual
of 0.050 for 6115 independent 'observed' reflections. Crystals are monoclinic,
P21/c, a 11.180(7), b 12.957(6), c 17.567(9) �, β 90.88(5)�, Z 4. The ruthenium-chlorine
distances, trans to phosphine and
carbonyl ligands, respectively, are 2.469(2), 2.446(2) �; the
ruthenium-phosphine distances, trans
to the chloride and dimethyl sulfoxide ligands, respectively, are 2.292(1),
2.313(2) �. Ruthenium-sulfur (dmso) is 2.380(2) �,
while the ruthenium-carbon(CO) is c. 1.72 �. For cis-[Ru(CO)2Cl2(opmpa)] (2) (opmpa ≡ (�)-ortho-phenylenebis{methyl(phenyl)-
arsine}, [o-C6H4(AsMePh)2]), refinement led to a residual of
0.036 for 2423 independent 'observed' reflections. Crystals are monoclinic, P21/c,
a 10.497(3), b 11.586(7), c 20.341(9) �,
β 105.31(4)�, Z 4. Ruthenium-arsine distances, trans to carbonyl and chlorine ligands, respectively, are 2.404(1),
2.455(1) �. Ruthenium-chlorine distances,
trans to arsine and carbonyl ligands, respectively, are 2.443(3), 2.433(2) �,
while ruthenium-carbon(CO) distances, trans
to arsine and chlorine ligands, respectively, are 1 .920(8), 1 .872(8) �.