Synthesis of thecis andtrans isomers oftert-butylaminedichloro-(dimethyl sulphoxide)platinum(II) and X-ray structure analysis of thecis compound |
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Authors: | Eberhard W. Neuse Axel G. Perlwitz John S. Field Niyum Ramesar |
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Affiliation: | (1) Department of Chemistry, University of the Witwatersrand, WITS 2050, Republic of South Africa;(2) Department of Chemistry, University of Natal at Pietermaritzburg, 3200 Pietermaritzburg, Republic of South Africa |
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Abstract: | Summary Treatment ofcis-dichlorobis(dimethyl sulphoxide)platinum(II) [1] with an excess oftert-butylamine in MeOH yieldstert-butylamine-trans-dichloro(dimethyl sulphoxide)-platinum(II) [(tr-5)], rather than thecis-diaminechloro-(dimethyl sulphoxide)platinum(II) cation expected by analogy with similar reactions reported in the literature. The correspondingcis isomer [(cis-5)] is prepared from the same reactants (and similarly from K2PtCl4 andtert-butylamine) in DMSO medium, in which the initially formedtrans compound partially isomerizes to the thermodynamically favouredcis 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-Cl bondscis andtrans to the DMSO ligand are 2.296(11) and 2.321(10) Å, respectively, and are well within expected ranges. Interatomic distances within the amine and DMSO ligands are normal. |
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