Synthesis and structures of metallocene complexes of iron(II) and ruthenium(II) derived from 9,9′-spirobifluorene |
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| Authors: | Richard E Douthwaite Neil Guillaume Adrian C Whitwood |
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| Institution: | Department of Chemistry, University of York, Heslington, York, N Yorkshire YO10 5DD, UK |
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| Abstract: | Reaction between 9,9′-spirobifluorene and CpM]+ (where M = Fe and Ru) equivalents gives the complexes CpRu(η6-SBF)]PF6] (1), (CpRu)2(η6,η6-SBF)]PF6]2 (2) and (CpFe)2(η6,η6-SBF)]PF6]2 (3), respectively. Single crystal X-ray structures of 1 and 3 show that the metal atoms exhibit distorted η6-coordination to SBF phenyl moieties primarily as a consequence of steric interactions between Cp and SBF. The structure of 3 contains each of the possible C2 enantiomers whereas NMR spectroscopy shows signals consistent with a 1:1 mixture of C2 and C1 stereoisomers for both 2 and 3. In conjunction with electrochemical data the observations are consistent with SBF acting as a molecule containing two independent biphenyl moieties. |
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| Keywords: | Metallocene Sandwich complexes 9 9&prime -Spirobifluorene Iron Ruthenium |
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