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  • 1
    ISSN: 0044-2313
    Keywords: Rhenium complexes ; carbonyl complexes ; nitrosyl complexes ; heptamethylindene ; crystal structures ; σ/η-bonding ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses of Metal Carbonyls. 23. Crystal Structure and Reactivity of Heptamethylindenyl Carbonyl Metal ComplexesReaction of heptamethylindene (C9(CH3)7, 1) with Re2(CO)10 yields [η5-C9(CH3)7]Re(CO)3 (2), which reacts with NO+BF4- to form the cationic complex [{η5-C9(CH3)7}Re(CO)2NO]+BF4- (3). Irradiation of 2 with UV light in the presence of triethyl phosphite leads to formation of [η5-C9(CH3)7]Re(CO)2[P(OC2H5)3] (4). Alkylation of (CH3)3SnCl with Ind*Li gives [η1-C9(CH3)7]Sn(CH3)3 (5). All compounds were characterized by spectroscopic methods. The molecular structures of 3 and 5 were determined by single crystal X-ray diffraction (3: P21/n (14), a = 1497.7(4) pm, b = 879.0(2) pm, c = 1609.0(4) pm and β = 110.99(2)°, R1 = 0.038, wR2 = 0.080; 5: P21/n (14), a = 726.1(1) pm, b = 2930.7(3) pm, c = 930.0(1) pm and β = 112.834(5)°, R1 = 0.044, Rw = 0.048). Complexes 2-4 exhibit a piano stool configuration with a η5-coordinated permethylindenyl ligand (Ind*). Compound 5 displays a η1 -coordination of the Ind* ligand. Temperature enhancement causes a hapticity change, as observed by NMR spectroscopy.
    Notes: Heptamethylinden (C9(CH3)7H, 1) reagiert mit Re2(CO)10 zu [η5-C9(CH3)7]Re(CO)3 (2), das durch Umsetzung mit NO+BF4- die kationische Verbindung[{η5-C9(CH3)7}Re (CO)2NO]+BF4- (3) und unter Bestrahlung mit UV-Licht in Anwesenheit von Triethylphosphit [η5-C9(CH3)7]Re(CO)2[P(OC2H5)3] (4) ergibt. Durch Alkylierung von (CH3)3SnCl wird [η1-C9(CH3)7]Sn(CH3)3 (5) erhalten. Alle Verbindungen wurden mit spektroskopischen Methoden vollständig charakterisiert. Von 3 und 5 wurden die Kristallstrukturen röntgenstrukturanalytisch bestimmt (3: P21/n (14), a = 1497.7(4) pm, b = 879.0(2) pm, c = 1609.0(4) pm und β = 110.99(2)°, R1 = 0.038, wR2 = 0.080; 5: P21/n (14), a = 726.1(1) pm, b = 2930.7(3) pm, c = 930.0(1) pm und β = 112.834(5)°, R1 = 0.044, Rw = 0.048). Während bei den Komplexen 2-4 der Heptamethylindenligand (Ind*) einen Halbsandwich-Komplex bildet (η5-Bindung zum Metall), so liegt in Derivat 5 erwartungsgemäß eine σ-Bindung zwischen einem C-Atom des Ind*-Liganden und dem Metallzentrum vor. Bei Temperaturerhöhung tritt eine Änderung der Haptizitätsverhältnisse ein (NMR-Evidenz).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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