Abstract
The organometallic complexes C5H5 Fe(I) C6(C2H5)6 and C5(CH3)5 Fe(I)C6 H(C2H5)5 have been studied by Mossbauer spectroscopy. Hyperfine data are typical for 19e− systems with one electron on the e 1 * orbital. The thermal variation of the quadrupole splittings indicates vibronic reduction of the spin-orbit constant, in agreement with previous analyses of similar 19e− systems. The quadrupole splitting and recoil-free fraction data give evidence for phase transitions, which are discussed with respect to cooperative Jahn-Teller distortion and hindered rotations of the ethyl groups.
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