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  • Technetium  (1)
  • 1
    ISSN: 0044-2313
    Keywords: Technetium ; nitrido complexes ; mixed-ligand complexes ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Mixed-ligand Complexes of Technetium. XV. The Reaction of [TcNCl2(Me2PhP)3] with Dialkyldithiocarbamates and N,N-Dialkylthio-carbamoylbenzamidines[TcN(Cl)(Me2PhP)2(Et2dtc)], [TcN(Me2PhP)(Et2dtc)2], and [TcN(Et2dtc)2] can be prepared by stepwise ligand exchange reactions starting from dichlorotris(dimethylphenylphosphine)nitridotechnetium(V), [TcNCl2(Me2PhP)3], and diethyldithiocarbamate. In contrast to this, only one intermediate, [TcN(Cl)(Me2PhP)2(HEt2tcb)], could be isolated during the reaction with N,N-Diethlthiocarbamoylbenzamidine, which yields the bis chelate [TcN(HEt2tcb)2].[TcN(Me2PhP)(Et2dtc)2] crystallizes in the monoclinic space group P21/c; a = 17.369(5) Å, b = 15.024(1) Å, c = 9.906(3) Å, β = 76.47(1)º, Z = 4. The phosphine is coordinated equatorially. The multiply bonded nitrogen ligand (Tc—N(1) 1.624(3) Å) strongly labilizes the trans positioned donor atom (distance Tc—S(4) 2.826(1) Å).[TcN(HEt2tcb)2] crystallizes in the triclinic space group P1 with a = 9.749(4) Å, b = 11.264(4) Å, c = 12.359(4) Å, α = 75.34(2)º, β = 79.69(2)º, γ = 87.55(2)º, Z = 2. The metal is five-coordinate with the nitrido donor atom occupying the apex of a square pyramid. It's basal plane is formed by the cis-coordinated chelate ligands. The technetium is situated over the basal plane by about 0.6 Å. The Tc≡N distane was found to be 1.610(5) Å.
    Notes: Von Dichlorotris(dimethylphenylphosphan)-nitridotechnetium(V), [TcNCl2(MePhP)3] werden durch schrittweisen Ligandenaustausch mit Diethyldithiocarbamat Komplexe der Zusammensetzung [TcN(Cl)(Me2PhP)2(Et2dtc)], [TcN(Me2PhP)(Et2dtc)2] und [TcN(Et2dtc)2] dargestellt. Die Reaktion mit N,N-Diethylthiocarbamoylbenzamidin, H2Et2tcb, liefert dagegen in guten Ausbeuten das Bis-Chelat. Als einziges Intermediat der Reaktion läßt sich [TcN(Cl)(Me2PhP)2-(HEt2tcb)] isolieren.[TcN(Me2PhP)(Et2dtc)2] kristallisiert in der monoklinen Raumgruppe P21/c mit a = 17,369(5) Å, b = 15,024(1) Å, c = 9,906(3) Å, β = 76,47(1)º, Z = 4. Der Me2PhP-Ligand ist äquatorial koordiniert. Die auffällig kurze Mehrfachbindung zwischen Technetium und Stickstoff (Bindungslänge Tc—N(1) 1,624(3) Å) wirkt sich stark labilisierend auf das trans-ständige Donoratom aus (Abstand Tc—S(4) 2,826(1) Å).[TcN(HEt2tcb)2] kristallisiert in der triklinen Raumgruppe P1, mit a = 9,749(4) Å, b = 11,264(4) Å, c = 12,359(4) Å, α = 75,34(2)º, β = 79,69(2)º, γ = 87,55(2)º, Z = 2. Das Koordinationspolyeder ist eine quadratische Pyramide, deren Spitze vom Nitridoliganden besetzt ist. Ihre Grundfläche wird von den Donoratomen der cis-koordinierten Chelatliganden gebildet. Das Metall befindet sich um etwa 0,6 Å über der Grundfläche. Der Tc≡N-Abstand beträgt 1,610(5) Å.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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