Synthesis of thecisandtransisomers oftert-butylaminedichloro-(dimethyl sulphoxide)platinum(II) and X-ray structure analysis of theciscompound

✍ Scribed by Eberhard W. Neuse; Axel G. Perlwitz; John S. Field; Niyum Ramesar

• Publisher: Springer
• Year: 1995
• Tongue: English
• Weight: 496 KB
• Volume: 20
• Category: Article
• ISSN: 0340-4285
• DOI: 10.1007/bf00135404

✦ Synopsis

Treatment of cis-dichlorobis(dimethyl sulphoxide)platinum(II) [(I)] with an excess of tert-butylaminc in MeOH yields tert-butylamine-trans-dichloro(dimethyl sulphoxide)platinum(II) [(rr-5)], rather than the cis-diaminechloro-(dimethyl sulphoxide)platinum(II) cation expected by analogy with similar reactions reported in the literature. The corresponding cis isomer [(cis-5)] is prepared from the same reactants (and similarly from KzPtC14 and tert-butylamine) in DMSO medium, in which the initially formed trans compound partially isomerizes to the thermodynamically favoured cis complex. The molecular structure of(cis-5) is determined by X-ray analysis. The coordination around the Pt atom is square-planar, and the DMSO ligand is S-coordinated. The lengths of the Pt--C1 bonds cis and trans to the DMSO ligand are 2.296(11) and 2.321(10)/~, respectively, and are well within expected ranges. Interatomic distances within the amine and DMSO ligands are normal.