Vibrational spectroscopic study of the hydrated platinum(II), palladium(II) and cis-diammineplatinum(II) ions in acidic aqueous solutions

L. Kocsis, J. Mink, F. Jalilehv, L. J. Laffin, O. Berkesi, L. Hajba

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Mid infrared, far-infrared and Raman spectroscopic studies, combined with force field analyses, were performed for the hydrated platinum(II) and palladium(II) ions and c/s-diammineplatinum(II) complex in acidic aqueous solutions. Simplified Density Functional Theory (DFT) calculations were made for the equatorial plane of the platinum complexes. Careful subtraction of solvent spectra allowed a number of'internal' modes of coordinated H2Oand NH3 to be determined as weak residual bands. The [Pt(OH 2)?6]2+ and [cis-Pt(NH3) 2(OH2)4]2+ complexes were found to be six-coordinated with four ligands strongly bound in an equatorial plane. The assignments of the vibrational modes in the equatorial plane could be performed on the basis of the experimental observations and by comparison with metal - ligand vibrations of square-planar complexes, aided by normal coordinate calculations. For the weakly coordinated axial aqua ligands, the low wavenumber range and the polarizibility properties allowed the assignments of the bands at about 365 and 325 cm-1 to the stretching modes of one short and one longer Pt - O&z.ast; bound to axial aqua ligands, respectively. A similar picture with even less strongly bound axial water molecules emerges from Raman spectroscopy data for the hydrated palladium(II) ion, [Pd(OH2) 6]2+. The results are consistent with a description of the [Pt(OH2)6]2+ and [Pd(OH2) 6]2+ aqua ions in C4v symmetry, and with the [cis-Pt(NH3)2(OH2)4]2+ complexinthe Cs point group, and also in qualitative agreement with the structures devised from previous extended X-ray absorption fine structure (EXAFS) measurements.

Original languageEnglish
Pages (from-to)481-490
Number of pages10
JournalJournal of Raman Spectroscopy
Volume40
Issue number5
DOIs
Publication statusPublished - May 2009

Fingerprint

Palladium
Platinum
Ligands
Ions
Infrared radiation
Point groups
X ray absorption
Stretching
Density functional theory
Raman spectroscopy
Metals
Molecules
Water

Keywords

  • Acidic aqueous solutions
  • DFT calculation
  • Force constant correlation
  • Mid- and far-infrared spectra
  • Raman spectra

ASJC Scopus subject areas

  • Spectroscopy
  • Materials Science(all)

Cite this

Vibrational spectroscopic study of the hydrated platinum(II), palladium(II) and cis-diammineplatinum(II) ions in acidic aqueous solutions. / Kocsis, L.; Mink, J.; Jalilehv, F.; Laffin, L. J.; Berkesi, O.; Hajba, L.

In: Journal of Raman Spectroscopy, Vol. 40, No. 5, 05.2009, p. 481-490.

Research output: Contribution to journalArticle

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abstract = "Mid infrared, far-infrared and Raman spectroscopic studies, combined with force field analyses, were performed for the hydrated platinum(II) and palladium(II) ions and c/s-diammineplatinum(II) complex in acidic aqueous solutions. Simplified Density Functional Theory (DFT) calculations were made for the equatorial plane of the platinum complexes. Careful subtraction of solvent spectra allowed a number of'internal' modes of coordinated H2Oand NH3 to be determined as weak residual bands. The [Pt(OH 2)?6]2+ and [cis-Pt(NH3) 2(OH2)4]2+ complexes were found to be six-coordinated with four ligands strongly bound in an equatorial plane. The assignments of the vibrational modes in the equatorial plane could be performed on the basis of the experimental observations and by comparison with metal - ligand vibrations of square-planar complexes, aided by normal coordinate calculations. For the weakly coordinated axial aqua ligands, the low wavenumber range and the polarizibility properties allowed the assignments of the bands at about 365 and 325 cm-1 to the stretching modes of one short and one longer Pt - O&z.ast; bound to axial aqua ligands, respectively. A similar picture with even less strongly bound axial water molecules emerges from Raman spectroscopy data for the hydrated palladium(II) ion, [Pd(OH2) 6]2+. The results are consistent with a description of the [Pt(OH2)6]2+ and [Pd(OH2) 6]2+ aqua ions in C4v symmetry, and with the [cis-Pt(NH3)2(OH2)4]2+ complexinthe Cs point group, and also in qualitative agreement with the structures devised from previous extended X-ray absorption fine structure (EXAFS) measurements.",
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