Enantiomeric discrimination in coordination of sulfoxides to platinum(II): X-ray structure of the kinetically over thermodynamically favoured erythro cis-dichloro-bis(methyl-p-tolylsulfoxide) platinum (II)

Article abstract of DOI:10.1016/s0020-1693(97)05586-2

The erythro bis-sulfoxide complex cis-[PtCl₂{R-S(O)MeTol^p}{S-S(O)MeTol^p}] has been isolated, as the kinetically preferred product, in the reaction of K₂PtCl₄ with methyl-p-tolylsulfoxide in water/methanol. The crystal and molecular structure of the title complex has been determined by X-ray diffraction methods and compared with those of the thermodynamically preferred threo species cis-[PtCl₂{S(O)R′R″}₂] (R′ = Me, R″ = Ph or Tol^p). Crystal data: monoclinic, space group P2₁/n, a = 19.081(3), b = 5.992(1), c = 19.398(3) ?, β = 119.05(2)°, Z = 4, R = 0.0355. The kinetics of isomerization in chloroform of the erythro cis-[PtCl₂{ S(O)MeTol^p}₂] to a 1:3 mixture of erythro and threo species has been investigated.