Publikace detail

Iron-Sandwich Complexes - Additive Character of Interligand Substituent Effects

Autoři: Turek Jan | Olejník Roman | Štíbr Bohumil | Padělková Zdeňka

Rok: 2014

Druh publikace: ostatní - přednáška nebo poster

Strana od-do: nestránkováno

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
eng	Iron-Sandwich Complexes - Additive Character of Interligand Substituent Effects	The straightforward linear correlation of the number of methyl substituents on the arene ring (n) with 1H and 11B NMR chemical shifts of the dicarbollide cage atoms was revealed in the contiguous series of the [1-(6-MenC6H6-n Fe) (5-2,3-C2B9H11)] arene-dicarbollide complexes (where n = 1 - 6). This is in line with additive character of electron donation by the arene methyl substituents and its transfer onto the second sandwiching ring via the FeII center. Similar linear relationships were also observed in the 1H and 13C NMR spectra of the cyclohexadienyl and cyclopentadienyl ring atoms in the contiguous series of the isoelectronic cations [(5-C6H7)Fe(6-MenC6H6-n)]+ and [(5-C5H5)Fe(6-MenC6H6-n)]+. Surprisingly, the trend of this interesting interligand NMR effect was found rather different for 13C nuclei. It has become also obvious that the sensitivities to this effect differ, which might be taken as a quantitative measure for electron donating/withdrawing efficiency of various substituents attached to the arene ring. Moreover, structures of some these compounds were determined by XRD techniques.

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