Organometallated Halonium Salts of the Type [{Cp(CO)2Fe}2X]SbY6 (X = Cl,Br, I; Y = F,Cl) |
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Authors: | Rudolf Schneider Ingo‐Peter Lorenz Heinrich Nth Werner Ponikwar |
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Abstract: | The reaction of CpFe(CO)2X (X = Cl, Br, I) with SbY5 (Y = F, Cl) in toluene leads to the cationic, halogen‐bridged compounds {Cp(CO)2Fe}2X]SbY6 ( 1 – 6 ). The halide of CpFe(CO)2X is eliminated by the Lewis acid SbY5, and the fragment “CpFe(CO)2+” reacts with further CpFe(CO)2X to form the halogen bridge between both the organometallic substituents. The exclusive formation of the counter anion SbY6– is caused by the oxidizing action of the antimony pentahalides, by which SbY3 and the interhalogens XY are always obtained. The compounds have been characterized by their NMR‐, IR‐ and Mass spectra, the compounds 1 – 3 and 6 additionally by single crystal structure analyses. They show decreasing bond angles Fe–X–Fe following the range Cl → Br → I and the VSEPR concept; the two CpFe(CO)2 groups are staggered with the dihedral angle Cp(centre)–Fe–Fe–Cp(centre) of about 160°. |
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Keywords: | Halonium salts Ferrio substituent Halogen bridges Iron complexes Structure |
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