On the Orbital Ground State and the Magnitude of the Quadrupole Interaction in Some High-spin Iron(II) Pyridine Complexes
Mössbauer spectra of the pseudooctahedral complex trans-Fe(pyridine)4(NCS)2 have been measured at 4.2°K in applied magnetic fields of up to 60 kG. The principal component of the electric field gradient tensor is positive and consistent with a 5B2g ground electronic state in a tetragonal local site symmetry. The sign of the quadrupole interaction is discussed in relation to a number of recent investigations in which orbital ground terms are assigned solely on the basis of the magnitude and temperature of the quadrupole interaction.
W. M. Reiff et al., "On the Orbital Ground State and the Magnitude of the Quadrupole Interaction in Some High-spin Iron(II) Pyridine Complexes," Inorganic and Nuclear Chemistry Letters, vol. 12, no. 5, pp. 405-413, Elsevier Limited, Jan 1976.
The definitive version is available at https://doi.org/10.1016/0020-1650(76)80051-7
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