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Your search keyword '"Kiraly, Robert"' showing total 7 results
Start Over Author "Kiraly, Robert" Publisher american chemical society
7 results on '"Kiraly, Robert"'

1. Equilibria and structure of the lanthanide(III)-2-hydroxy-1,3-diaminopropane-N,N,N',N'-tetraacetate complexes: Formation of alkoxo-bridged dimers in solid state and solution

Author

Tircso, Gyula, Benyei, Attila, Brucher, Erno, Kiraly, Robert, and Kis, Anita

Subjects
Nitrogen compounds -- Structure, Nitrogen compounds -- Electric properties, Chemical reactions -- Research, Tetracaine -- Electric properties, Chemistry
Abstract

The complex formed between 1,3-diamino-2-hydroxypropane-N,N,N',N'-tetraacetic acid and [Nd.sup.3+] at pH 7.5 is found to be a dinuclear dimer in the solid state, in which the alcoholic OH groups are deprotonated, and the alkoxo oxygens are coordinated to both [Nd.sup.3+] in a bridging position. Results of NMR studies of the [La.sup.3+] complex, the number and multiplicity of signals, and values of coupling constants are in agreement with the dinuclear dimer structure of the complex in solution.

Published
2006

3. Synthesis, potentiometric, kinetic, and NMR studies of 1,4,7,10-tetraazacyclododecane-1,7-bis(acetic acid)-4,10-bis(methylenephosphonic acid) (DO2A2P) and its complexes with Ca(II), Cu(II), Zn(II) and lanthanide(III) ions

Author

Kalman, Ferenc K., Baranyai, Zsolt, Toth, Imre, Banyai, Istvan, Kiraly, Robert, Brucher, Erno, Aime, Silvio, Xiankai Sun, and Kovacs, Zoltan

Subjects
Potentiometry -- Analysis, Ligands (Biochemistry) -- Structure, Ligands (Biochemistry) -- Chemical properties, Ligands (Biochemistry) -- Electric properties, Nuclear magnetic resonance spectroscopy -- Analysis, Methylene compounds -- Structure, Methylene compounds -- Chemical properties, Methylene compounds -- Electric properties, Chemistry
Abstract

The synthesis and the protonation and chelation behavior of a cyclen-based ligand containing trans-acetate and trans-methylenephosphonate pendant groups, [H.sub.6]DO2ASP is described. Activation enthalpy and entropy values for enantiomerization process suggest that Ln(DO2A2P) complexes are less rigid than the corresponding DOTP complexes.

Published
2008

4. Potentiometric and relaxometric properties of a gadolinium-based MRI contrast agent for sensing tissue pH

Author

Kalman, Ferenc K., Woods, Mark, Caravan, Peter, Jurek, Paul, Spiller, Marga, Tircso, Gyula, Kiraly, Robert, Brucher, Erno, and Sherry, Dean A.

Subjects
Magnetic resonance imaging -- Analysis, Gadolinium -- Electric properties, Gadolinium -- Magnetic properties, Hydrogen-ion concentration -- Measurement, Potentiometry, Chemistry
Abstract

The pH-sensitive contrast agent, GdDOTA-4AmP (Gd1) is used to map tissue pH by MRI. The study shows that the complexation reaction run at a pH no lower than 9 to produce only the desired pH-sensitive, Type II product needed for imaging pH by MRI.

Published
2007

5. Solution dynamics and stability of lanthanide(III) (s)-2(p-nitrobenzyl)DOTA complexes

Author

Woods, Mark, Kovacs, Zoltan, Kiraly, Robert, Brucher, Erno, Zhang, Shanrong, and Sherry, A. Dean

Subjects
Rare earth metals -- Analysis, Rare earth metals -- Chemical properties, Chemistry
Abstract

A study conducted on the lanthanide(III) complexes of the parent ligand DOTA is presented. Results of a study of the solution structures, stability, and properties of the lanthanide complexes of (S)-2-(p-nitrobenzyl)-DOTA (p-NO2-Bn-DOTA), the chemical precursor to p-SCN-Bn-DOTA, are reported.

Published
2004

6. Equilibrium, (super)1 H and (super)13 C NMR spectroscopy, and X-ray diffraction studies on the complexes Bi(DOTA) (super)- and Bi(DO3A-Bu)

Author

Csajbok, Eva, Baranyai, Zsolt, Banyai, Istvan, Brucher, Erno, Kiraly, Robert, Muller-Fahrnow, Anke, Platzek, Johannes, Raduchel, Bernd, and Schafer, Martina

Subjects
Chemistry, Inorganic -- Research, Inorganic compounds -- Composition, Nuclear magnetic resonance spectroscopy -- Usage, Chemical equilibrium -- Analysis, Coordination compounds -- Composition, Bismuth, Chemistry
Abstract

Research has been conducted on bismuth(II) complexes. The authors discuss Bi(DO3A-Bu) complex which has been proposed as nonionic contrast agent in X-ray imaging, and report the results of their investigation of its soluition equilibria, dynamics and NMR structure.

Published
2003

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