The molecular structure of the title compound has been determined by gas-phase electron diffraction, the vapour composition being obtained by quadrupole mass spectrometry. The experimental data can best be approximated by a model with a puckered four-membered ring (C2v symmetry). This deviation from D2h symmetry may be a consequence of large-amplitude vibrations around an imaginary axis connecting the two bridging chlorine atoms. The bond lengths and angles for the puckered-ring model are ra(Fe-Cl) (terminal) 2.127(4), ra(Fe-Cl) (bridge) 2.326(5) Å, Clt-Fe-Clt 124.3(7), and Clb-Fe-Clb 90.7(4)°. The bond lengths and force constants indicate that the terminal Fe-Cl bonds are considerably stronger than the bridging ones.
|Number of pages||3|
|Journal||Journal of the Chemical Society, Dalton Transactions|
|Publication status||Published - Dec 1 1980|
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