The complex salt K[Pt((C2H5)2C(OH)C≡CC(OH)(C2H5)2)Cl3] forms monoclinic crystals, a = 10.841(5), b = 9.796(4), c = 17.414(6) Å, β = 100.44(2)°, Z = 4, space group P21/c. Positional and anisotropic thermal parameters were refined to R = 0.069 and Rw = 0.064 by using 1662 independent reflections.The coordination around platinum is planar, and the triple bond of the acetylenic ligand is approximately perpendicular to the coordination plane. The triple bond is 1.18(3) Å and the C≡C—C angles [Formula: see text] show a deformation of the ligand in a direction away from the platinum atom with the two hydroxyl groups in cis configuration, above and below the plane of the PtCl3 group. The cis Pt—Cl bonds are of normal length, but the trans Pt—Cl bond seems to be shorter. The K+ ion is surrounded by four chlorine atoms and two oxygen atoms at relatively short distances. The oxygen–potassium attraction seems to be the predominant direct interaction of the—OH groups with the rest of the crystal.
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Beauchamp et al. (1973) studied this question.