NMR study of acid-base equilibria and other reactions of ammineplatinum complexes with aqua and hydroxo ligands

Appleton T.G., Hall J.R., Ralph S.F. and Thompson C.S.M. (1989) NMR study of acid-base equilibria and other reactions of ammineplatinum complexes with aqua and hydroxo ligands. Inorganic Chemistry, 28 10: 1989-1993.

Author Appleton T.G.
Hall J.R.
Ralph S.F.
Thompson C.S.M.
Title NMR study of acid-base equilibria and other reactions of ammineplatinum complexes with aqua and hydroxo ligands
Journal name Inorganic Chemistry   Check publisher's open access policy
ISSN 0020-1669
Publication date 1989
Sub-type Article (original research)
Volume 28
Issue 10
Start page 1989
End page 1993
Total pages 5
Subject 1604 Human Geography
Abstract 15N and 195Pt NMR spectra have shown that [Pt( 15NH 3) 3] 2(μ-OH) 3+ slowly forms when a solution containing Pt( 15NH 3) 3(H 2O) 2+ and Pt( 15NH 3) 3(OH) + is allowed to stand. By measurement of the change in δ N or J(Pt-N) as the pH of a solution of Pt( 15NH 3) 3(H 2O) 2+ was changed, the pK a for this complex was determined (6.37 ± 0.10). Reaction of a solution of cis-Pt( 15NH 3) 2(H 2O) 2 2+ with chloride gave a solution containing cis-Pt( 15NH 3) 2Cl(H 2O) + and cis-Pt( 15NH 3) 2Cl 2. When the pH was increased to approximately 7, a new species, assigned as [Pt( 15NH 3) 2] 2(μ-Cl)(μ-OH) 2+, was formed. The variation of δ N trans to water/hydroxide with pH for cis-Pt( 15NH 3) 2Cl(H 2O) + allowed the pK a for this species to be determined (6.85 ± 0.10). Bromide behaved in an analogous way, but cis-Pt(NH 3)(H 2O) 2 2+ reacted with 1 mol of iodide to give [{Pt(NH 3) 2(μ-I)} 2] 2+. The NMR peaks from this complex were previously wrongly assigned to cis-Pt(NH 3) 2I 2. Changes in δ N of cis-Pt( 15NH 3) 2(H 2O) 2 2+ with pH allowed the values of pK a1 and pK a2 to be determined, at 5°C, to reduce the rate of formation of hydroxo-bridged species (5.93 ± 0.10 and 7.87 ± 0.10, respectively).
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
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