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Synthesis and characterization of novel tricarboxylatoplatinum(IV) complexes. Nucleophilic substitution of (diamine)-tetrahydroxoplatinum(IV) with carboxylic acid

Title
Synthesis and characterization of novel tricarboxylatoplatinum(IV) complexes. Nucleophilic substitution of (diamine)-tetrahydroxoplatinum(IV) with carboxylic acid
Authors
Song R.Kim K.M.Sohn Y.S.
Ewha Authors
손연수
SCOPUS Author ID
손연수scopus
Issue Date
2002
Journal Title
Inorganica Chimica Acta
ISSN
0020-1693JCR Link
Citation
vol. 338, pp. 89 - 93
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
The reaction of [Pt(IV)(dach)(OH)4] (dach=trans-(±)-1,2-diaminocyclohexane) with an excess of carboxylic acid at room temperature afforded tricarboxylatoplatinum(IV) complexes, [Pt(dach)(L)3(OH)] (L=acetato, propionato, valerato) in contrast to the carboxylation reaction with excess carboxylic anhydrides, which gave only tetracarboxylatoplatinum(IV) complexes as a major product. The protonation on hydroxo ligand of the platinum(IV) complex to form aqua ligand seems to be followed by nucleophilic substitution by carboxylate or chloride anion. Such nucleophilic substitution afforded only partially substituted tricarboxylatoplatinum(IV) complexes in carboxylic acid solvent whereas the reaction in 0.1 M HCl solution gave tetrachloroplatinum(IV) complex. This difference is explainable by different pKa values of the four aqua ligands, among which the last aqua ligand may have sufficiently low pKa value allowing the protonation only in strong acidic media like hydrochloric acid. © 2002 Elsevier Science B.V. All rights reserved.
DOI
10.1016/S0020-1693(02)00977-5
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자연과학대학 > 화학·나노과학전공 > Journal papers
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