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12 results on '"Merbach, Andre E."'

4. EPR on aqueous Gd<SUP>3+</SUP> complexes and a new analysis method considering both line widths and shifts

Author

Borel, Alain, Tóth, Éva, Helm, Lothar, Jánossy, András, and Merbach, Andre´ E.

Abstract

We performed variable temperature (0–100°C), concentration and frequency (9.425, 75, 150 and 225 GHz) continuous wave electron paramagnetic resonance (EPR) measurements on three different Gd(iii) compounds: [Gd(H2O)8]3+, [Gd(DOTA)(H2O)]- (DOTA: 1,4,7,10-tetrakis(carboxymethyl)-1,4,7,10-tetraazacyclododecane) and [Gd(DTPA-BMA)(H2O)] (DTPA-BMA: 1,5-[bis(N-methylcarbamoyl)methyl]- 1,3,5-tris(carboxymethyl)-1,5-diamino-3-azapentane) in aqueous solution. A simultaneous analysis of peak-to-peak widths and dynamic frequency shifts provides access to the transverse electronic relaxation, which is described using a transient zero field splitting (ZFS) mechanism with a spin rotation contribution. Our simultaneous analysis procedure involves numerical calculations using the full relaxation matrix and yields results in acceptable agreement with experimental data for reasonable values of the ZFS parameters (trace of the square of the ZFS Hamiltonian Δ2=1019–1020 s-2 depending on the complex, correlation time of the fluctuations τv298=10-11–10-10 s). We also discuss the relationship between our approach and recent developments found in the literature.

Published
2000

5. Water and Proton Exchange Processes on Metal Ions

Author

Helm, Lothar, Nicolle, Gaelle M., and Merbach, Andre E.

Abstract

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.

Published
2006
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9. ChemInform Abstract: Applications of Advanced Experimental Techniques: High Pressure NMR and Computer Simulations

Author

Helm, Lothar and Merbach, Andre E.

Abstract

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Published
2002
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10. ChemInform Abstract: Similarities and Differences Between the Isoelectronic Gd(III) and Eu(II) Complexes with Regard to MRI Contrast Agent Applications

Author

Toth, Eva, Burai, Laszlo, and Merbach, Andre E.

Abstract

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Published
2001
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11. ChemInform Abstract: Substitution Studies of Second‐ and Third‐Row Transition Metal Oxo Complexes

Author

Roodt, Andreas, Abou‐Hamdan, Amira, Engelbrecht, Hendrik P., and Merbach, Andre E.

Abstract

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Published
2000
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12. ChemInform Abstract: High‐Pressure NMR Kinetics. Part 89. Nuclear and Electronic Relaxation of Eu2+(aq): An Extremely Labile Aqua Ion.

Author

Caravan, Peter, Toth, Eva, Rockenbauer, Antal, and Merbach, Andre E.

Abstract

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Published
2000
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