Abstract
The temperature dependencies of the nuclear hyperfine interactions (isomer shift, quadrupole splitting and resonance effect magnitude) for two [2]ferrocenophanes have been studied by 57Fe Mössbauer effect spectroscopy over the temperature range from 90 K to above room temperature, and compared to analogous data for both staggered and eclipsed forms of unbridged ferrocene. The effect of the two-atom bridge, as well as the possibility of a direct metal atom-olefin moiety interaction have been examined in detail. The temperature dependence of the quadrupole splitting is not uniquely related to the tilt angle of the two Cp rings, and is distinct from that observed for related [1]ferrocenophanes.
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