Abstract
The structure of o -(diphenylphosphino) phenyl- cis -1,2-dicarbomethoxyethenyltriphenylphosphineplatinum,(Ph 3P)[Ph 2P(C 6H 4)]Pt- cis -(CO 2MeCCHCO 2Me), has been determined by single crystal X-ray diffraction methods. The crystals are triclinic, space group P 1 , two molecules per unit cell with dimensions a = 12.560(1), b = 13.600(1), c = 11.452(1) Å, α = 110.01(1), β = 97.58(1), and γ = 91.03(1)°. A calculated density of 1.57 g cm −3 for two formula units per cell is consistent with the measured value of 1.56(2) g cm −3. The coordination about the platinum atom is square-planar with the two phosphine ligands oriented cis with respect to one another. The σ-bonded vinyl group also possesses cis stereochemistry. The geometry of the four-atom metallocyclic ring in this compound is compared to those of metallocyclobutene and platinacyclobutane complexes. The average PtP bond length is 2.330(2) Å and the observed PtC bond lengths are 2.059(8) and 2.026(8) Å. These bond lengths are discussed in terms of the trans -influence. Full-matrix least-squares refinement has yielded R = 0.047 (0.048 for weighted R) based on the 5208 reflections whose intensities are significantly above background (I net ≥ 10 counts s −1).
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