Mössbauer-Effekt-Untersuchungen an Eisen(II)-bis(α-Diimin)-Komplexen
Open Access
- 1 October 1967
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung A
- Vol. 22 (10) , 1543-1550
- https://doi.org/10.1515/zna-1967-1013
Abstract
Fe57 MÖSSBAUER spectra have been obtained on twenty-one iron (II)-bis (α-diimine) complexes. The high-spin compounds differ from the low-spin compounds by significantly higher values of the isomer shift δ and of the quadrupole splitting ΔEQ. A recalibration of the total s-electron density is employed to determine 4s populations between 0.19 and 0.27. The order of decreasing values of δ corresponds to the nephelauxetic series, suggesting considerable back-bonding in the spin-paired configuration. The temperature dependence of ΔEQ is used to estimate values of the axial field splitting Δaxial · Six-coordinated iron (II) compounds having a triplet ground state are characterized by values of δ between 0.30 and 0.40 mm/sec, and ΔEQ between 0.18 and 0.32 mm/sec. A tentative explanation for the small ΔEQ is proposed.Keywords
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