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  • 1
    ISSN: 0044-2313
    Keywords: Technetium Compounds ; Rhenium complexes ; X-ray diffraction ; radiopharmaceuticals ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Characterization of μ-oxo Dimeric Technetium and Rhenium Complexes with Functionalized Amine Phenolate Ligands. X-Ray Crystal Structures of [O=TcL1—O—L1Tc=O] · H2O and [O=ReL1—O—L1Re=O] Complexes (H2L1 = N,N′-bis(2-hydroxybenzyl)-1,3-diamino-2-(4-nitrobenzyl)propane)Neutral rhenium(V) and technetium(V) chelates with the tetradentate amine phenolate ligand N,N′-bis(2-hydroxybenzyl)-1,3-diamino-2(-4-nitrobenzyl)propane (H2L1) have been prepared from [MOCl4]- complexes and structurally characterized. The ligand coordinates tetradentately with deprotonation of the phenolic oxygen atoms.[O=TcL1—O—L1Tc=O] · H2O crystallizes monoclinic in the space group P21/c with a = 10.633(2), b = 13.705(1), c = 16.364(3) Å; β = 94.65(1)°, Z = 2. Two TcOL1 units with each one terminal oxo core are connected by a μ-oxo ligand. The technetium atoms are situated in distorted octahedral coordination spheres. Two distinct Tc—O bond lengths have been found for the almost linear O=Tc—O—Tc=O unit (Tc=O(terminal): 1.655(7) Å and Tc—O(μ-oxo): 1.903(1)) Å.The analogous rhenium compound crystallizes in the same space group with a = 13.302(7), b = 9.956(1), c = 17.535(9) Å; β = 106.72(2)°, Z = 2. The dimeric [O=ReL1—O—L1Re=O] complex has a structure which is very similar to that of the corresponding technetium compound.
    Notes: Ausgehend von [MOCl4]--Komplexen werden mit dem vierzähnigen Amin-Phenolato-Liganden N,N-Bis(2-hydroxybenzyl)-1,3-diamino-2-4-nitrobenzyl)propan (H2L1) Rhenium(V)- und Technetium(V)-Chelate hergestellt und strukturell charakterisiert. Es entstehen sauerstoffverbrückte, neutrale Zweikernkomplexe mit einer zentralen [O=M—O—M=O]4+-Einheit. Der Ligand koordiniert jeweils vierzähnig unter Deprotonierung der Phenolfunktionen.[O=TcL1—O—L1Tc=O] · H2O kristallisiert monoklin in der Raumgruppe P21/c mit a = 10,633(2); b = 13,705(1); c = 16,364(3) Å; β = 94,65(1)°; Z = 2. Zwei TcOL1-Einheiten mit je einem terminalen Oxo-Liganden sind über eine Sauerstoff-Brücke miteinander verknüpft. Das Metall befindet sich in einer verzerrt oktaedrischen Umgebung. Für die Tc—O-Bindung der nahezu linearen O=Tc—O—Tc=O-Einheit wurden zwei unterschiedliche Bindungsabstände bestimmt (Tc=O(terminal): 1,655(7) Å und Tc—O(Brücke): 1,903(1) Å.Die analoge Rheniumverbindung kristallisiert in der gleichen Raumgruppe mit a = 13,302(7); b = 9,956(1); c = 17,535(9) Å; β = 106,72(2)°; Z = 2. Für das ebenfalls dimere Komplexmolekül [O=ReL1—O—L1Re=O] konnten ähnliche Bindungsverhältnisse wie für sein Technetium-Analogon bestimmt werden.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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