1,2,3-Dithiazolyl and 1,2,35-Dithiadiazolyl Radicals as Spin-Bearing ...

some effect on several of the bond lengths which would therefore impact frequency of the
absorption associated with the stretches of the bonds that are most affected by the
presence of the extra electron. The peak associated with the N-S bond within the new
1,2,3-DTA ring was at 721 cm -1 and has shifted substantially to 680 cm -1 . The weak
intensity peak at 1261 cm -1 associated with the N-S stretches of the 1,2,5-TDA ring is not
shifted substantially, however the medium intensity peaks at 936 and 584 cm -1 in V-3
have shifted to 913 and 575 cm -1 in V-1 respectively, both lower than in the precursor
salt. Similarly, the C-N stretches have shifted form 1482 and 1535 cm -1 in V-3 to 1493
and 1544 cm -1 respectively in V-1. The C-Cl stretch has also shifted from an absorption
at 861 cm -1 in V-3 to 814 cm -1 in V-1.
Figure 5-4. Infrared spectra of V-1 and overlaid with V-3. Peaks labelled for V-1 only.
5.2.4 X-ray Crystallography
The only compound for which X-ray crystallography quality crystals were obtained
was V-4. They were grown from a combination of acetonitrile and chlorobenzene as
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