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  • Articles: DFG German National Licenses  (2)
  • 31P-NMR  (1)
  • Coordination modes  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 614 (1992), S. 131-141 
    ISSN: 0044-2313
    Keywords: Rhenium complexes ; oxygen ligands ; tripod ligands ; 31P-NMR ; radionuclides ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Rhenium Complexes Stabilized by Tris-chelating Oxygen Ligands: Potential New Radiopharmaca?Ris-chelating oxygen ligands of the general formula L- = [(C5H4R)Co{P(O)R′R″}3]- (R = COOCH3, COOH and R′ = OCH3; R = H and R′ = O(CH2)5COOCH3, O(CH2)5COOH; R″ = OCH3) have been synthesized. These ligands L- and others of the same type have been used to prepare the rhenium oxo complexes [LReO3] and [LReOX2] (X = Cl, Br, I). In order to judge their use in radioimmunotherapy the corresponding complexes containing radioactive rhenium isotopes have also been synthesized. The rhenium(VII) as well as the diamagnetic rhenium(V) complexes are stable in air in the solid state as well as in organic solvents. They hydrolyze slowly in water to yield perrhenic acid. The X-ray structures of the sodium salt Na[(C5H4COOCH3)Co{P(O)(OCH3)2}3] and of the rhenium complex [LReOBr2] (R = H, R′ = R″ = OCH3) have been determined. The sodium salt crystallizes in trimeric units with the composition [(NaL)3 · 3 H2O]. Each sodium has a distorted octahedral oxygen coordination. In [LReOBr2] the ReO4Br2 octahedron is only slightly distorted.
    Notes: Vier neue Sauerstoffchelatliganden L- der allgemeinen Formel [(C5H4R)Co{P(O)R′R″}3]- (R = COOCH3, COOH und R′ = OCH3; R = H und R′ = O(CH2)5COOCH3, O(CH2)5COOH; R″ = OCH3) wurden synthetisiert. Diese neuen Liganden L- und andere Liganden des gleichen Typs wurden für die Darstellung von Rhenium(VII)-Komplexen [LReO3] und Rhenium(V)-Komplexen [LReOX2] (X = Cl, Br, I) eingesetzt. Im Hinblick auf deren mögliche Verwendbarkeit in der Radioimmunotherapie wurden die Synthesen auch auf radioaktive Rheniumisotope übertragen. Sowohl die Rhenium(VII)- als auch die diamagnetischen Rhenium(V)-Komplexe sind in fester Form und in organischen Lösungsmitteln an Luft beständig; sie zersetzen sich in Wasser langsam unter Bildung von Perrheniumsäure. Das Natriumsalz Na[(C5H4COOCH3)Co{P(O)(OCH3)2}3] kristallisiert als dreikernige Einheit der Zusammensetzung [(NaL)3 · 3 H2O]. Jedes Natrium ist verzerrt oktaedrisch von Sauerstoff umgeben. Die Kristallstrukturbestimmung der Verbindung [LReOBr2] (R = H, R′ = R″ = OCH3) zeigt die erwartete schwach verzerrte oktaedrische Koordination des Rheniums.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 29 (1990), S. 627-637 
    ISSN: 0570-0833
    Keywords: Coordination modes ; Cobalt ; O ligands ; Tridentate ligands ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Metal complexes are capable of accomplishing almost anything, provided they contain the proper metal/ligand combinations. A host of essential biochemical transformations - but also a great many industrially significant reactions - occur within the coordination spheres of metal ions. For instance, the particular arrangement of ligands in the zinc-containing enzyme carboanhydrase is responsible for an acceleration in the hydration of CO2 by a factor of 109. It is the ligands that determine whether an iron atom will transfer molecular oxygen, as in the case of hemoglobin, or electrons, as with the cytochromes. By varying the ligands it is possible to establish in advance whether a metal ion in the presence of synthesis gas will cause an olefin to be hydrogenated or hydroformylated. Stated more generally, it is the ligands that stabilize the particular oxidation states of a metal and determine how substrate molecules will be coordinated and undergo reaction. The synthesis of new ligands that confer specific reactivity on metal ions is thus an important challenge for the coordination chemist. The following article describes organometallic compounds of the type [CpCo{P(O)R′R″}3]⊖, which have developed from an extremely unreactive laboratory curiosity into versatile oxygen-containing ligands whose steric and electronic properties promise a series of interesting applications.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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