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Additivity of Interligand Substituent Effects for the Isoelectronic [(η5‑C6H7)Fe(η6‑MenC6H6–n)]+ and [(η5‑C5H5)Fe(η6‑MenC6H6–n)]+ Sandwich Cations

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journal contribution
posted on 09.06.2014, 00:00 by Jan Turek, Roman Olejník, Bohumil Štı́br
Complete assignments of chemical shifts in the 1H and 13C NMR spectra for a contiguous series of [(η5-C6H7)­Fe­(η6-MenC6H6–n)]+ and [(η5-C5H5)­Fe­(η6-MenC6H6–n)]+ cations (where n = 0–6) are reported. The spectra revealed a straightforward linear correlation between δ­(1H) or δ­(13C) parameters of the cyclohexadienyl (Chd) and cyclopentadienyl (Cp) rings and the number of arene methyl substituents (n), which is consistent with an additive character of the interligand substituent effect and its transmission onto the second (Chd or Cp) ring via the FeII center.