Reaktionen an komplexgebundenen Liganden, XXII Synthese und Reaktionen von Cyclopentadienyl-diphosphan-carbonyl-Eisen- und Chrom-Komplexen / Reactions at Complex Bonded Ligands, XXII Synthesis and Reactions of Cyclopentadienyl Diphosphane Carbonyl Iron and Chromium Complexes
Open Access
- 1 September 1977
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung B
- Vol. 32 (9) , 1010-1014
- https://doi.org/10.1515/znb-1977-0911
Abstract
The synthesis of binuclear iron and chromium complexes with bridging dppe ligands is reported, e.g. [μ-dppe{C5H5Fe(CO)Br}2] or [μ-dppe{C5H5Cr(CO)(NO)}2], (dppe = (C6H5)2PC2H4P(C6H5)2). With hydrazine, these compounds yield no doubly bridged complexes with dppe and N2H4 bridges, neither in dark- nor in photo-reactions. In case of the iron complexes either reduction of the starting complex or transformation of the dppe bridging ligand into a chelating ligand are observed instead. The reactions depend upon the polarity of the solvent and yield [μ-dppe{C5H5Fe(CO)}2] in benzene, however, [C5H5Fe(CO)(dppe)]Br in tetrahydrofuran. The chromium complex undergoes decomposition on UV irradiation, splitting off CO and yielding the chelate complex [C5H5Cr(NO)(dppe)] as well as polymeric [C5H5Cr(NO)]x.Keywords
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