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Australian Journal of Chemistry Australian Journal of Chemistry Society
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RESEARCH ARTICLE

Oxidation of [PtIICl2(ethane-1,2-diamine-N,N'-dicarboxylic Acid)] and Ligand Ring Closure in the Platinum(IV) Oxidation State

Pong Nai (Bonnie) Wong, Murray S. Davies and Trevor W. Hambley

Australian Journal of Chemistry 54(5) 303 - 306
Published: 30 November 2001

Abstract

Oxidation of the dichloroplatinum(II) complex of the potentially tetradentate ligand ethane-1,2-diamine-N,N´-diacetic acid (H2enda) gives rise to a variety of products. A number of these species have been crystallographically characterized. [PtIVCl2(enda)] as the hemihydrate crystallizes in the monoclinic space group P21/a, with a 11.238(1), b 15.665(2), c 13.737(2) Å, β 109.44(1)˚, and was refined to an R value of 0.030 on 3015F. [PtIVCl2(enda)] as the monohydrate crystallizes in the orthorhombic space group Pna21, with a 6.984(2), b 9.000(3), c 18.431(3) Å, and was refined to an R value of 0.025 on 992F. [PtIVCl3(Henda)]·H2O crystallizes in the orthorhombic space group Pbca, with a 11.741(1), b 12.851(2), c 17.133(2) Å, and was refined to an R value of 0.029 on 2015F. The major product is the ring-closed complex [PtIVCl2(enda)] and if the solution is heated under reflux for 24 h, this is the only product. In contrast, reaction of cis,trans-[PtIVCl2(OH)2(ethane-1,2-diamine)] with excess acetic acid was shown not to lead to displacement of the hydroxo ligands.

https://doi.org/10.1071/CH01081

© CSIRO 2001

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