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Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science
RESEARCH ARTICLE

Electrochemistry, Protein Binding and Crystal Structures of Platinum(II) and Platinum(IV) Carboxylato Complexes

Andrew R. Battle, Glen B. Deacon, Rachael C. Dolman and Trevor W. Hambley

Australian Journal of Chemistry 55(11) 699 - 704
Published: 31 December 2002

Abstract

The crystal structures of the platinum(II) complexes [Pt(ox)(en)] (ox = oxalato, en = ethane-1,2-diamine) and [Pt(ethmal)(en)] (ethmal = ethylmalonato), and of their platinum(IV) analogues, trans-[Pt(OH)2(ox)(en)].H2O and trans-[Pt(ethmal)(OH)2(en)], have been determined. All crystallize in the monoclinic space group P21/c, with the exception of trans-[PtIV(OH)2(ox)(en)].H2O which crystallizes in C2/c. The ethylmalonato ligand in [PtII(ethmal)(en)] adopts a pseudo-boat conformation. Changes in the fold angles of the boat occur on oxidation and introduction of the trans hydroxo ligands. The cathodic forward half-wave potentials of the platinum(iv) complexes (including trans-[Pt(mal)(OH)2(en)], mal = malonato) are reported and reveal that these complexes are more difficult to reduce than analogous complexes with equatorial chloro ligands. The binding of trans-[Pt(OH)2(ox)(en)].H2O and trans-[Pt(mal)(OH)2(en)] to mouse albumin was investigated with no binding observed after 6 h and a very small amount observed for the latter complex after 24 h.

https://doi.org/10.1071/CH02086

© CSIRO 2002

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