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π Back-Bonding of Iron(II) Complexes Supported by Tris(pyrid-2-ylmethyl)amine and Its Nitro-Substituted Derivatives

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journal contribution
posted on 24.11.2011, 00:00 by Shinya Furukawa, Yutaka Hitomi, Tetsuya Shishido, Kentaro Teramura, Tsunehiro Tanaka
The electronic and geometric structures of a series of iron(II) complexes supported by tetradentate tris(pyrid-2-ylmethyl)amine-type ligands with different numbers of 4-nitropyridine groups, [(PyCH2)3–n(4-NO2PyCH2)nN] (n = 0–3), were examined by X-ray absorption fine-structure and variable-temperature 1H NMR spectroscopies and theoretical calculations to reveal how the low-spin state is stabilized through π back-bonding interactions between iron(II) and 4-nitropyridine donor group(s).