Equilibria of mononuclear oxomolybdenum(VI) complexes of triethanolamine. A multinuclear dynamic magnetic resonance study of structure and exchange mechanisms

Gábor Szalontai, Gábor Kiss, L. Bartha

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

1D and 2D 1H and 13C NMR spectra of the assumed [MoO4(TEA)]2- complex recorded in DMSO at variable temperatures clearly indicate one free and two bound hydroxyethyl arms. The free arm of the ligand readily exchanges with the two metal-bound arms. Under such conditions the triethanolamine (TEA) acts as a bidentate ligand. The presence of water accelerates the exchange, which at higher water content involves the free ligand too. In organic solvents the binding strength of the hydroxo groups to the molybdenum is weaker than that of the water molecules. A plausible structure is confirmed by 14N, 17O and 95Mo measurements and an exchange mechanism based on the existence of an eight-membered relatively rigid chelate ring is suggested.

Original languageEnglish
Pages (from-to)1995-2007
Number of pages13
JournalSpectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Volume59
Issue number9
DOIs
Publication statusPublished - Jul 2003

Fingerprint

Triethanolamine
Magnetic resonance
magnetic resonance
Ligands
ligands
Molybdenum
Water
Dimethyl Sulfoxide
chelates
Organic solvents
Water content
water
moisture content
molybdenum
Metals
Nuclear magnetic resonance
nuclear magnetic resonance
Molecules
rings
metals

Keywords

  • Exchange mechanism
  • Molybdenum(VI)
  • Multinuclear magnetic resonance spectroscopy
  • Structure
  • Triethanolamine complexes

ASJC Scopus subject areas

  • Spectroscopy

Cite this

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abstract = "1D and 2D 1H and 13C NMR spectra of the assumed [MoO4(TEA)]2- complex recorded in DMSO at variable temperatures clearly indicate one free and two bound hydroxyethyl arms. The free arm of the ligand readily exchanges with the two metal-bound arms. Under such conditions the triethanolamine (TEA) acts as a bidentate ligand. The presence of water accelerates the exchange, which at higher water content involves the free ligand too. In organic solvents the binding strength of the hydroxo groups to the molybdenum is weaker than that of the water molecules. A plausible structure is confirmed by 14N, 17O and 95Mo measurements and an exchange mechanism based on the existence of an eight-membered relatively rigid chelate ring is suggested.",
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T1 - Equilibria of mononuclear oxomolybdenum(VI) complexes of triethanolamine. A multinuclear dynamic magnetic resonance study of structure and exchange mechanisms

AU - Szalontai, Gábor

AU - Kiss, Gábor

AU - Bartha, L.

PY - 2003/7

Y1 - 2003/7

N2 - 1D and 2D 1H and 13C NMR spectra of the assumed [MoO4(TEA)]2- complex recorded in DMSO at variable temperatures clearly indicate one free and two bound hydroxyethyl arms. The free arm of the ligand readily exchanges with the two metal-bound arms. Under such conditions the triethanolamine (TEA) acts as a bidentate ligand. The presence of water accelerates the exchange, which at higher water content involves the free ligand too. In organic solvents the binding strength of the hydroxo groups to the molybdenum is weaker than that of the water molecules. A plausible structure is confirmed by 14N, 17O and 95Mo measurements and an exchange mechanism based on the existence of an eight-membered relatively rigid chelate ring is suggested.

AB - 1D and 2D 1H and 13C NMR spectra of the assumed [MoO4(TEA)]2- complex recorded in DMSO at variable temperatures clearly indicate one free and two bound hydroxyethyl arms. The free arm of the ligand readily exchanges with the two metal-bound arms. Under such conditions the triethanolamine (TEA) acts as a bidentate ligand. The presence of water accelerates the exchange, which at higher water content involves the free ligand too. In organic solvents the binding strength of the hydroxo groups to the molybdenum is weaker than that of the water molecules. A plausible structure is confirmed by 14N, 17O and 95Mo measurements and an exchange mechanism based on the existence of an eight-membered relatively rigid chelate ring is suggested.

KW - Exchange mechanism

KW - Molybdenum(VI)

KW - Multinuclear magnetic resonance spectroscopy

KW - Structure

KW - Triethanolamine complexes

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JO - Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy

JF - Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy

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