Molecular structure of dimeric iron trichloride in the vapour phase as determined by electron diffraction
- 1 January 1980
- journal article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 1,p. 87-89
- https://doi.org/10.1039/dt9800000087
Abstract
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.Keywords
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