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  • 1
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structures of the l,3,5-Trisilacyclohexane-Iron Dicarbonyl-cyclopentadienyl Complexes and C3H6Si3Cl5Fe(CO)2πcp and C3H6Si3Cl4(Fe(CO2)πcp)2Trisilapentachlorocyclo-hexyl-dicarbonylcyclopentadienyliron C3H6Si3Cl5Fe(CO)2πcp 1 and Trisilatetrachlorocyclohexyl-bis(dicarboncyclopentadienyliron)C3H6Si3Cl4(Fe(CO)2πcp)2 2 are 1,3,5-Trisilacyclohexane complexes substituted by dicarbonylcyclopentadienyliron at one and two silicon atoms of the six-membered ring, respectively. The crystal and molecular structures were determined from single crystals (1; space group P21/a (No. 14); a = 1100.5 pm; b = 2033.9 pm; c = 843.3pm; β = 98.58°; Z = 4; MoKα-radiation; 3142h k l; R = 0.036. 2; space group P1; (No. 2); a = 1231.1 pm; b = 1267.3 pm; c = 1045.9 pm; α = 113.23°; β = 83.93°; γ = 115.00°; Z = 2; Mokα-radiation; 4196 h k 1; R = 0.065). In both complexes the six-membered rings of the carbosilane ligands are in skew-boat conformation. The bond lengths Fe—Si are 226.4 pm and 228.1 pm, respectively. The distances Si—C and Si—Cl are 186 pm and 206 pm in 1 and 187 pm and 209 pm in 2. Their different lengths depend on the position in the ligand system and can be explained with the concept of bond orders.
    Notes: Trisilapentachlorocyclohexyl-dicarbonylcyclopentadienyleisen C3H6Si3Cl5Fe(CO)2πcp 1 und Trisilatetrachlorocyclohexyl-bis(dicarbonylcyclopentadienyleisen) C3H6Si3Cl4(Fe(CO)2πcp)2 2 sind 1,3,5-Trisilacyclohexan-Komplexe mit Dicarbonylcyclopentadienyleisen als Substituenten an einem bzw. zwei Si-Atomen des Sechsrings. Die Kristall- und Molekülstrukturen wurden an Einkristallen bestimmt (1; Raumgruppe P21/a (Nr. 14); a = 1100,5 pm; b = 2033,9 pm; c = 843,3 pm; β = 98,58°; Z = 4; MoKα-Strahlung; 3142 h k l; R = 0,036. 2; Raumgruppe P1 (Nr. 2); a = 1231,1 pm; b = 1267,3 pm; c = 1045,9pm; α = 113,23°;β = 83,93°; γ = 115,00°; Z = 2; MoKα-Strahlung; 4196 h k l; R = 0,065). In beiden Komplexen liegen die Sechsringe der Carbosilanliganden in der Konformation von Twistwannen vor. Die Bindungsabstände Fe—Si betragen 226,4 pm in 1 bzw. 228,1 pm in 2. Die Abstände Si—C und Si—Cl liegen bei 186 pm und 206pm in 1 bzw. 187 pm und 209 pm in 2. Sie hängen von der Position im Ligandensystem ab. Die unterschiedlichen Bindungslängen können mit dem Konzept der Bindungsordnungen erklärt werden.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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