Search results for: Hans-Juergen Pietzsch

Items from 1 to 12 out of 12 results

article

An ⁸⁶ Y-Labeled Mirror-Image Oligonucleotide: Influence of Y-DOTA Isomers on the Biodistribution in Rats ^†

Joern Schlesinger, Inge Koezle, Ralf Bergmann, Sergio Tamburini, more

Bioconjugate Chemistry > 2008 > 19 > 4 > 928 - 939

article

Synthesis and Biological Evaluation of a New Type of ^99m Technetium-Labeled Fatty Acid for Myocardial Metabolism Imaging

Martin Walther, Christian M. Jung, Ralf Bergmann, Jens Pietzsch, more

Bioconjugate Chemistry > 2007 > 18 > 1 > 216 - 230

article

Preparation and Biological Characterization of Isomeric ¹⁸⁸ Re(V) Oxocomplexes with Tetradentate S ₄ Ligands Derived from meso -Dimercaptosuccinic Acid for Labeling of Biomolecules

Sepp Seifert, Tobias Heinrich, Christian Jentschel, Christian Smuda, more

Bioconjugate Chemistry > 2006 > 17 > 6 > 1601 - 1606

article

Octahedral rhenium cluster complexes with organic ligands: Synthesis, structure and properties of [Re6Q8(3,5-Me2PzH)6]Br2·2(3,5-Me2PzH) (Q=S, Se)

Yuri V. Mironov, Konstantin A. Brylev, Michael A. Shestopalov, Spartak S. Yarovoi, more

Inorganica Chimica Acta > 2006 > 359 > 4 > 1129-1134

Two new octahedral cluster complexes – [Re ₆ S ₈ (3,5-Me ₂ PzH) ₆ ]Br ₂ ·2(3,5-Me ₂ PzH) (1) and [Re ₆ Se ₈ (3,5-Me ₂ PzH) ₆ ]Br ₂ ·2(3,5-Me ₂ PzH) (2), where 3,5-Me ₂ PzH is 3,5-dimethylpyrazole, have been synthesized using reaction of rhenium chalcobromide complexes Cs ₄ [Re ₆ ...

article

Mixed-Ligand Rhenium-188 Complexes with Tetradentate/Monodentate NS ₃ /P (‘4 + 1') Coordination: Relation of Structure with Antioxidation Stability

Eik Schiller, Sepp Seifert, Francesco Tisato, Fiorenzo Refosco, more

Bioconjugate Chemistry > 2005 > 16 > 3 > 634 - 643

article

The Crucial Role of the Diphosphine Heteroatom X in the Stereochemistry and Stabilization of the Substitution-Inert [M(N)(PXP)] ²⁺ Metal Fragments (M = Tc, Re; PXP = Diphosphine Ligand)

Francesco Tisato, Fiorenzo Refosco, Marina Porchia, Cristina Bolzati, more

Inorganic Chemistry > 2004 > 43 > 26 > 8617 - 8625

article

Synthesis, Characterization, and Biological Evaluation of Technetium(III) Complexes with Tridentate/Bidentate S,E,S/P,S Coordination (E = O, N(CH ₃ ), S): A Novel Approach to Robust Technetium Chelates Suitable for Linking the Metal to Biomolecules

Hans-Juergen Pietzsch, Sepp Seifert, Rosemarie Syhre, Francesco Tisato, more

Bioconjugate Chemistry > 2003 > 14 > 1 > 136 - 143

article

Stability studies on ⁹ ⁹ ^m Technetium(III) complexes with tridentate/monodentate thiol ligands and phosphine ('3+1+1' complexes)

Sepp Seifert, Antje Drews, Antje Gupta, Hans-Juergen Pietzsch, more

Applied Radiation and Isotopes > 2000 > 53 > 3 > 431-438

The preparation and characterisation of 3+1+1 technetium complexes of the general formula [Tc(SES)(RS)(PMe ₂ Ph)] (SES=tridentatedithiolligand, E=S, O, NMe; RSH=monothiolligand) at the n.c.a. level is described. The Tc(III) complexes are prepared in a one-step procedure starting from pertechnetate in yields of 85-95% of radiochemical purity. A comparison of their chromatographic data with...

article

Study on the formation of mixed ligand oxorhenium and oxotechnetium complexes (SNS/S combination)

Minas Papadopoulos, Ioannis Pirmettis, Charalabos Tsoukalas, Berthold Nock, more

Inorganica Chimica Acta > 1999 > 295 > 1 > 1 - 8

Theoretically, several complexes can be formed during the reaction between the tridentate aminedithiol ligand EtN(CH ₂ CH ₂ SH) ₂ , L1H ₂ , the monodentate thiol p-ClC ₆ H ₄ SH, L2H, and the Re ^V OCl ₃ (PPh ₃ ) ₂ . Three main possibilities are: (i) neutral mixed ligand complexes ReOL1L2, the syn isomer, complex 1 and the...

article

No Carrier Added Preparations of 3 + 1 Mixed-ligand ⁹ ⁹ ^m Tc Complexes

Sepp Seifert, Hans-Juergen Pietzsch, Matthias Scheunemann, Hartmut Spies, more

Applied Radiation and Isotopes > 1998 > 49 > 1-2 > 5-11

The no carrier added (n.c.a.) preparation of potentially receptor-binding 3 + 1 mixed-ligand technetium complexes has not so far been successfully accomplished.This article deals with our results in the preparation of n.c.a. Tc complexes with tridentate S-S-S or S-N-S ligands and a series of bulky monothiolato ligands. It was found that Tc(V) gluconate or Tc(V) ethylene glycolate are suitable...

article

Structural modification of receptor-binding technetium-99m complexes in order to improve brain uptake

Bernd Johannsen, Ralf Berger, Peter Brust, Hans-Juergen Pietzsch, more

European Journal of Nuclear Medicine and Molecular Imaging > 1997 > 24 > 3 > 316-319

Abstract. Low brain uptake is a generally accepted problem in developing technetium-99m brain receptor imaging agents. For a class of potential 5-HT2A receptor-binding agents we tried to improve the original low brain uptake of 0.4% injected dose (ID) in rats 5 min p.i. by modifying the lipophilic properties of the molecules. Because of the presence of a protonable nitrogen, which according to the...

article

Technetium and rhenium complexes with thioether ligands--IV. Synthesis and structural characterization of binuclear oxorhenium(V) complexes with bidentate thioether coordination

Hans-Juergen Pietzsch, Hartmut Spies, Peter Leibnitz, Guenter Reck

Polyhedron > 1995 > 14 > 13-14 > 1849-1853

Binuclear oxorhenium(V) complexes, [ReO( S ₂ )Cl ₂ ] ₂ O, have been prepared by reduction of ReO ^- ₄ with SnCl ₂ in strongly acidic solution and in the presence of aliphatic thioethers of the general formula R--CH ₂ CH ₂ --S--CH ₂ CH ₂ --S--CH ₂ CH ₂ --R ( S ₂ ; R, R = H, Et; R = S--Bu, R =...

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