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Your search keyword '"Burai, Laszlo"' showing total 14 results
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14 results on '"Burai, Laszlo"'

1. Separation and characterization of the two diastereomers for [Gd(DTPA)-bz-NH2)(H2O)](super 2-), a common synthon in macromolecular MRI contrast agents: Their water exchange and isomerization kinetics

Author

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

Subjects
Chemical synthesis -- Research, Rare earth metals -- Chemical properties, Diastereomers -- Research, Chemistry
Abstract

A demonstration that the diastereomer ratio for Ln(super III) DTPA derivatives remains constant throughout the lanthanide series, in contrast to Ln(super III) EPTPA derivatives, where it varies as a function of the cation size with a maximum for the middle lanthanides is presented. An HPLC analysis showed that the diastereomer ratio for Ln(super III) DTPA derivatives remains constant throughout the lanthanide series.

Published
2005

2. Revising the mechanism of the permanganate/oxalate reaction

Author

Kovacs, Krisztian A., Grof, Pal, Burai, Laszlo, and Riedel, Miklos

Subjects
Oxalates -- Chemical properties, Electron paramagnetic resonance -- Usage, Chemicals, plastics and rubber industries
Abstract

Electron paramagnetic resonance (EPR) measurements and stopped-flow studies with spectrophotometrical detection are performed. The concentration profiles of four species of the permanganate/oxalate reaction are measured.

Published
2004

3. Synthesis, potentiometry, and NMR studies of two new 1,7-disubstituted tetraazacyclododecanes and their complexes formed with lanthanide, alkaline earth metal, Mn(2+), and Zn(2+) ions

Author

Burai, Laszlo, Ren, Jimin, Kovacs, Zoltan, Brucher, Erno, and Sherry, A. Dean

Subjects
Rare earth metals -- Research, Ligands -- Research, Chemistry
Abstract

Both of the two new 1,7-disubstituted-1,4,7,10-tetraazacyclododecane ligands DO2P and DO2PME form 1:1 M:L complexes with lanthanide, alkaline, earth metal, Mn(2+) and Zn(2+) ions. According to 17O shifts, 1H relaxation rates and 31P nuclear magnetic resonance data, the nonprotonated Ln(3+) complexes are in an 'in-cage' position in LnHDO2P and are octacoordinate, with six ligand donors and two inner-sphere coordinated water molecules. In the diprotonated complexes, however, the Ln(3+) cation shifts to an 'out-of-cage' position.

Published
1998

6. Rigid M(super II)L(sub 2)Gd(sub 2)(super III) (M = Fe, Ru) complexes of a terpyridine-based heteroditopic chelate: A class of candidates for MRI contrast agents

Author

Costa, Jerome, Ruloff, Robert, Burai, Laszlo, Helm, Lothar, and Merbach, Andre E.

Subjects
Iron compounds -- Chemical properties, Ruthenium -- Chemical properties, Ligands -- Analysis, Chemistry
Abstract

A thermodynamic study is performed on ligand protonation and complex formation with regard to practical aspects of a safe application of [Fe(tpy-DTTA)2Gd2(H2O)4] as a magnetic resonance imaging (MRI) contrast agent. The synthesis and results on the structure and relaxivity of the Ru(super II) containing analogue of the Fe(super II)Gd(sub 3)(super II) complex is reported.

Published
2005

7. Structural XAFS investigation of EU(super 2+) and Sr(super 2+) poly (amino carboxylates): consequences for water exchange rates on MRI-relevant complexes

Author

Moreau, Gilles, Burai, Laszlo, Helm, Lothar, Purans, Juris, and Merbach, Andre E.

Subjects
Extended X-ray absorption fine structure -- Usage, Amino compounds -- Atomic properties, Amino compounds -- Research, Molecular structure -- Analysis, Chemicals, plastics and rubber industries
Abstract

The dynamic properties of EU(super 2+) DOTA(super 4-), DTPA(super 5-) and ODDA(super 2-) complexes were characterized using X-ray absorption fine structure (XAFS) technique in the solid state and in aqueous solution. High water exchange rates could be valuable in designing more efficient responsive contrast agents for magnetic resonance imaging.

Published
2003

8. EuII-cryptate with optimal water exchange and electronic relaxation: a synthon for potential pO2 responsive macromolecular MRI contrast agents

Author

Burai, Laszlo, Scopelliti, Rosario, Toth, Eva, and LEGOUPIL, Laëtitia

Subjects
[SDV] Life Sciences [q-bio]
Abstract

The cryptate [EuII(2.2.2)(H2O)2]2+ displays several interesting features with respect to pO2 responsive MRI contrast agent applications: it is relatively stable against oxidation, it has two inner sphere water molecules, and the water exchange and electron spin relaxation rates are in the optimal range to attain high proton relaxivities, provided the rotation is also optimized.

Published
2002

10. Synthesis, potentiometry, and NMR studies of two new 1,7-dis ubstituted tetraazacyclododecanes...

Author

Burai, Laszlo, Ren, Jimin, Kovacs, Zoltan, Brücher, Erno, and Sherry, A. Dean

Subjects
*LIGANDS (Chemistry), *INORGANIC chemistry
Abstract

Presents a study which examines the chemical characteristics of the tetraazacyclododecane ligands. Information on the protonated complexes; What the alkaline earth metal ion-DO2P complexes formed; Indication of results.

Published
1998
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