𝔖 Bobbio Scriptorium
✦   LIBER   ✦

NMR study of intramolecular chemical exchange in the La(III) complex of triethylenetetraaminehexaacetic acid in aqueous solution

✍ Scribed by Sueg-Geun Lee

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
546 KB
Volume
38
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis

An intramolecular ligand rearrangement taking place via a bond-breaking process in the lanthanum(III) complex of triethylenetetraaminehexaacetic acid was probed by dynamic NMR experiments. Evidence that the ligands are exchanging derives from the observation of temperature-and mixing time m -dependent cross peaks between the diastereotopic 1 and 2 protons on each side of the complex in the 2D EXSY experiment. The exchange rate coefficients, k, were determined to be 7.1 ð 10 2 , 29.1 ð 10 2 , 70.0 ð 10 2 and 140.4 ð 10 2 s 1 at 295, 310, 320 and 330 K, respectively, corresponding to the activation parameters E a D 69.6 kJ, H 6 D D 66.9 kJ mol 1 and S 6 D D 39.6 J mol 1 .

📜 SIMILAR VOLUMES

Study of the behaviour of amino acids in
Study of the behaviour of amino acids in aqueous solution by time-domain NMR and high-resolution NMR
✍ M. Khallouk; D. N. Rutledge; A. M. S. Silva; I. Delgadillo 📂 Article 📅 2005 🏛 John Wiley and Sons 🌐 English ⚖ 189 KB

## Abstract The study of protein hydration by time‐domain NMR is complicated by the great number of interactions involved, resulting from the presence of several amino acids and the possible modifications produced by the various structures. Moreover, a good comprehension of the molecular interactio

Study of the self-association of methyla
Study of the self-association of methylated pyrimidines in aqueous solutions by 1H NMR chemical shifts
✍ Ferenc Aradi 📂 Article 📅 1990 🏛 John Wiley and Sons 🌐 English ⚖ 355 KB 👁 1 views

## Abstract The self‐association of pyrimidine and its methylated derivatives was studied by measuring the concentration‐dependent changes in proton chemical shifts in deuterium oxide at 35°C. The data were analysed by a dimer model with two parameters. The equilibrium constants give an increasing

Mechanistic Studies on the Oxidation of
Mechanistic Studies on the Oxidation of Nitrite by a μ-Oxodiiron(III,III) Complex in Aqueous Acidic Media
✍ Jhimli Bhattacharyya; Subrata Mukhopadhyay 📂 Article 📅 2005 🏛 John Wiley and Sons 🌐 German ⚖ 147 KB 👁 1 views

## Abstract Examined in this study is the kinetics of a net 2e^−^ transfer between [Fe~2~(__μ__‐O)(phen)~4~(H~2~O)~2~]^4+^ (1) and its hydrolytic derivatives [Fe~2~(__μ__‐O)(phen)~4~(H~2~O)(OH)]^3+^ (2) and [Fe~2~(__μ__‐O)(phen)~4~(OH)~2~]^2+^ (3) with $\rm{{{NO}}\_{{2}}^ - }$ in aqueous media and

Spectrometric study of solute–solvent in
Spectrometric study of solute–solvent interactions for the solvolysis of chloropentaamine cobalt(III) complex in binary aqueous mixtures
✍ Gehan M. El-Subruiti; Ghassan O. Younes; Farah S. Zeitouni; Mohamed F. Amira 📂 Article 📅 2008 🏛 John Wiley and Sons 🌐 English ⚖ 198 KB 👁 1 views

## Abstract Kinetic studies of solvent structure effects and solute–solvent interactions on the solvolysis of [Co(NH~3~)~5~Cl]^2+^ complex ion have been investigated spectrophotometrically in binary aqueous mixtures. Three cosolvents were used (acetonitrile, dimethylsulfoxide, and urea) over a wide