Abstract
The electron paramagnetic relaxation phenomena of (π-C 5H 5) 2TaCl 2, (π-C 5H 5) 2NbCl 2 and (π-C 5H 5) 2 VCl 2 in dilute chloroform solutions have been investigated. This has enabled the separate contributions to the observed EPR linewidths from spin-rotational interaction, g-tensor anisotropy, hyperfine coupling anisotropy, and unresolved chlorine hyperfine coupling to be evaluated. These results have been used to estimate the size of the chlorine isotropic hyperfine coupling constants and thus the extent of delocalisation of the unpaired electron on to the chlorine ligands.
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