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Synthesis of cis - and trans -platinum compounds with pyrimidine and crystal structures of trans -[Pt(pyrimidine) 2 X 2 ] where X = Cl and Br

1981; NRC Research Press; Volume: 59; Issue: 2 Linguagem: Inglês

10.1139/v81-031

1480-3291

F.D. Rochon, Pi-Chang Kong, R. Melanson,

Ferrocene Chemistry and Applications

cis- and trans-[Pt(pm) 2 X 2 ] where pm = pyrimidine and X = Cl, Br, have been synthesized. The cis-compounds were isolated from the reaction of K 2 PtCl 4 and pm in water, while the trans-isomers were obtained by isomerization of cis-[Pt(pm 2 X 2 ] in DMF in the presence of pm.The crystal structures of the two compounds trans-[Pt(pm) 2 X 2 ] have been determined by X-ray diffraction. The two compounds (X = Br and Cl) are isostructural. The crystals belong to the monoclinic P2 1 /c space group. The cell parameters are a = 4.787(3), b = 14.257(7), c = 8.503(3) Å and β = 99.33(4)° when X = Cl and a = 4.826(3), b = 14.822(5), c = 8.516(5) Å and β = 101.26(4)° when X = Br. The platinum atom is located on a centre of symmetry at the origin and Z = 2. The residual factors are R = 0.029 and R w = 0.036 (X = Cl) and R = 0.036 and R w = 0.035 (X = Br).