The sign of the 57Fe quadrupole splittings in iron(II) low-spin compounds: partial quadrupole splittings and bonding properties of ligands
- 1 January 1971
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A
- p. 3165-3167
- https://doi.org/10.1039/j19710003165
Abstract
The signs of Vzz(and e2qQ) at the 57Fe nucleus for the following compounds have been measured by use of the Mössbauer magnetic field technique: trans-FeCl2(p-MeO·C6H4·NC)4, trans-FeCl2(depe)2[depe = 1,2-bis(diethylphosphino)ethane]. Na3[Fe(CN)5NH3],H2O, K3[Fe(CN)5H2O],7H2O, all positive; cis-FeCl2(p-MeO·C6H4·NC)4 and trans-Fe(CN)2(EtNC)4, both negative. The 2: –1 trans:cis ratio has been confirmed, and partial quadrupole splittings (p.q.s.) for sixteen ligands have been assigned. These p.q.s. values become more positive as the π-acceptor function of a ligand increase, and the σ-donor properties of a ligand decreases [i.e. p.q.s.α(π—σ)]. The p.q.s. values are related to the bonding properties of these ligands.Keywords
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