On the Reaction of [(CO)3Fe(μ‐Me2NCO)2Fe(CO)2(NHMe2)] with Chelating Ligands — X‐Ray Structures of New Binuclear μ‐Carbamoyl Complexes |
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Authors: | Wolfgang Petz Bernhard Neumüller Jens Pudewills |
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Abstract: | Reaction of the binuclear μ‐carbamoyl complex (CO)3Fe(μ‐Me2NCO)2Fe(CO)2(HNMe2)] ( 1 ) in toluene with the chelating ligands Ph2PCH2PPh2 (dppm) and Ph2PCH2CH2PPh2 (dppe) gives different results. With dppm only the complex (CO)3Fe(μ‐Me2NCO)2Fe(CO)2(dppm)] ( 3 ) with a dangling ligand is obtained under replacement of amine, whereas with dppe depending on the reaction conditions up to three compounds are found. A 1 : 1 mixture of the educts generates the related complex (CO)3Fe(μ‐Me2NCO)2Fe(CO)2(dppe)] ( 4 ) together with the tetranuclear complex {(CO)3Fe(μ‐Me2NCO)2Fe(CO)2}2(dppe)] (5 ). 4 slowly converts into (CO)3Fe(μ‐Me2NCO)2Fe(CO)(dppe)] ( 6 ) with dppe acting as a chelating ligand. 6 is the first compound in this series in which one of the five CO groups is replaced by another donor. A 2 : 1 molar ratio of 1 and dppe quantitatively produces 5 . Addition of CO to a solution of 6 proceeds under slow reversible conversion of the complex into 4 . The compounds were characterized by the usual spectroscopic methods; 3 , 5 and 6 were also studied by X‐ray diffraction analyses. |
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Keywords: | Iron Chelating ligands Bridging carbamoyl groups Crystal structures |
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