Characterization of Vanadium(V) Complexes in Aqueous Solutions: Ethanolamine- and Glycine-Derived Complexes

Crans, Debbie C.; Shin, Paul K.S.

doi:10.1021/ja00083a016

Cited by 115 publications

(100 citation statements)

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“…The NMR spectra were recorded on a Varian Inova-300 spectrometer (USA) at 78.9 MHz (7.0 T) for 51 V, at 75.46 MHz 13 C and at 300 MHz for 1 H. The 51 V is a quadrupolar nucleus and with high natural abundance and a frequency near that of 13 C. The parameters used for recording the 51 V NMR spectra were as follows; a sweep width of 33000 Hz, a pulse width of 90 o and an acquisition time of 0.050 sec. 13 The chemical shifts were recorded against an external standard of VOCl 3 (0 ppm).…”

Section: Nmr and Epr Spectroscopymentioning

confidence: 99%

“…13 The chemical shifts were recorded against an external standard of VOCl 3 (0 ppm). 13 The spectra were processed using no linebroadening or baseline correction.…”

Section: Nmr and Epr Spectroscopymentioning

confidence: 99%

“…13 The chemical shifts were recorded against an external standard of VOCl 3 (0 ppm). 13 The spectra were processed using no linebroadening or baseline correction. Spectra were integrated using the Varian software, and the concentrations calculated from the mole fraction of each signal.…”

Section: Nmr and Epr Spectroscopymentioning

confidence: 99%

“…The 1 H and 13 C NMR chemical shifts were referenced against an external sample of 3-(trimethylsilyl)-1-propanesulfonic acid sodium salt (DSS) at ambient temperature. 13 The EPR spectra were recorded on a Bruker EMX spectrometer (USA). The X-band EPR spectra were recorded at ambient temperature in 1 mm quartz capillary tubes that were placed in 5 mm quartz EPR tubes.…”

Section: Nmr and Epr Spectroscopymentioning

confidence: 99%

“…The vanadate oligomers observed in the 51 V NMR spectra include monomer (V 1 ; defined as the sum of H 2 VO 4 -or HVO 4 2-), dimer (V 2 ) and tetramer (V 4 ); these species are related as shown in equations (1) and (3). 13 The concentration of VO 2 + was obtained directly from the integration of the spectra at acidic pH. Since decavanadate gives three signals (-416, -499 and -515 ppm), the two signals can be used to calculate the component of the third signal that overlap with the V-tratrate complex.…”

Section: Interpretation Of Nmr Spectramentioning

confidence: 99%

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Spectrometric and electrochemical investigation of vanadium(V) and vanadium(IV) tartrate complexes in solution

Khan¹,

Crans²,

Pauliukaitė³

et al. 2006

J. Braz. Chem. Soc.

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Os complexos de vanádio(IV) e (V) com tartarato formados em solução e as suas possíveis interconversões foram estudados utilizando-se técnicas espectroscópicas e eletroquímicas. A investigação foi feita através de espectroscopia de NMR de 51 V combinada com 1 H, de NMR de 13 C e espectroscopia de EPR. Como técnicas electroquímicas utilizaram-se a polagrografia e a voltametria cíclica. Verificou-se que complexo que se forma em maior extensão, em quase todo o intervalo de pH, é o de vanádio(V)-tartarato na proporção 1:1. O complexo 1:2 apresentou menor contribuição. Estes complexos foram formados a partir do complexo de vanádio(IV)-tartarato 2:2. A caracterização electroquímica de V(V) em solução na presença de tartarato por polarografia e por voltametria cíclica demonstrou a formação de complexos. Foram determinados os coeficientes de difusão dos íons livres de vanádio e dos complexos de vanádio-tartarato. Os valores dos coeficientes de difusão foram de 3 × 10 -6 cm 2 s -1 a 17 × 10 -6 cm 2 s -1 , dependendo do pH.Spectroscopic and electrochemical studies were carried out to characterize the vanadium(IV) and (V) complexes that form in solution and their interconversions. 51 V NMR spectroscopy coupled with 1 H NMR, 13 C NMR and EPR spectroscopy were used to characterize the vanadium(V)-tartrate complexes that form in the vanadium-tartrate system. The major complex that forms over most of the pH range is a 1:1 complex. In addition a minor 1:2 complex forms. The 1:2 complex formed from enantiomerically pure tartaric acid was less stable than complex formed from racemic tartaric acid. These complexes are different than the 2:2 complex that is the major contributor in the vanadium(IV)-tartrate system. The polarographic and cyclic voltammetic investigations of the electrochemical behavior of V(V) in the presence of tartrate demonstrated a complex formation. The diffusion coefficient values of free vanadium ions and vanadium-tartrate complexes were determined. The minimum average values for the diffusion coefficient for the vanadium(IV)-tartrate 2:2 complexes were determined to range from 3 × 10 -6 cm 2 s -1 to 17 × 10 -6 cm 2 s -1 depending on pH.

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Section: Nmr and Epr Spectroscopymentioning

confidence: 99%

“…13 The chemical shifts were recorded against an external standard of VOCl 3 (0 ppm). 13 The spectra were processed using no linebroadening or baseline correction.…”

Section: Nmr and Epr Spectroscopymentioning

confidence: 99%

Section: Nmr and Epr Spectroscopymentioning

confidence: 99%

Section: Nmr and Epr Spectroscopymentioning

confidence: 99%

Section: Interpretation Of Nmr Spectramentioning

confidence: 99%

See 3 more Smart Citations

Spectrometric and electrochemical investigation of vanadium(V) and vanadium(IV) tartrate complexes in solution

Khan¹,

Crans²,

Pauliukaitė³

et al. 2006

J. Braz. Chem. Soc.

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Vanadate complex spectroscopy at the RNase A active site

Krauß

Wladkowski

1998

Int J of Quantum Chemistry

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Knowledge of the ionicity of the phosphorane intermediate is importantto the analysis of the microscopic mechanism of the hydrolysis of the phosphate ester Ž . bond by ribonuclease A RNase A . Five-coordinate uridine vanadate, an analog of the phosphorane, binds to RNase A as the monoanion. The absorption spectra of the vanadate is a probe of the electronic structure of the active site. An in vacuo theoretical y Ž . model of H VO is calculated to have transitions only in the far ultraviolet UV . transition energy of the monoanion calculated in the field of the protein active site with effective fragment potentials shifts modestly to the red. Broad monoanion absorptions are predicted which would overlap an observed incomplete very broad absorption attributed to the complex of uridine vanadate with RNase A. The absorption bands of neutral ethylene glycol vanadate are predicted to be further to the red but also overlap the experimental absorption.

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Oxovanadium(IV) and -(V) Complexes with Aminoalcohol Ligands: Synthesis, Structure, Electrochemical, and Magnetic Properties

Plass

1998

Eur. J. Inorg. Chem.

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Characterization of Vanadium(V) Complexes in Aqueous Solutions: Ethanolamine- and Glycine-Derived Complexes

Cited by 115 publications

References 0 publications

Spectrometric and electrochemical investigation of vanadium(V) and vanadium(IV) tartrate complexes in solution

Spectrometric and electrochemical investigation of vanadium(V) and vanadium(IV) tartrate complexes in solution

Vanadate complex spectroscopy at the RNase A active site

Oxovanadium(IV) and -(V) Complexes with Aminoalcohol Ligands: Synthesis, Structure, Electrochemical, and Magnetic Properties

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