Abstract
The influence of alkyl and aryl groups attached to the diimine ring of the ligand on the properties of several iron(II) diimine complexes was investigated by 57Fe Mössbauer spectroscopy. The Mössbauer spectra, taken at 295 and 4.2°K, showed that the isomer shift (δ) remains almost constant in all the series, whereas the quadrupole splitting (Δ E Q ) changes markedly when a phenyl group is present in the ligands. Measurements with external applied magnetic field indicated a negative sign for the electric field gradient at the iron nucleus. The results are discussed on the basis of the comparison with the electronic spectra, taking into account the special features which arise from the presence of a phenyl group at the ligands.
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