Abstract
The substitution of sulfur
with selenium in benzimidazole- (bnt), benzoxazole- (bot) and benzothiazole-2-thione (btt)
has been used to locate the vibrations related to the >C=S group. The
thioketone bnt behaves like imidazolidine-2-thione,
since it gives typical >C=S absorptions below 700 cm-1, while btt, like thiazolidine-2-thione, also gives rise to >C=S
absorptions around 1000 cm-1. In bot the selenation also affects the NH modes, thus producing
differences in several ranges of the infrared spectrum. The S- and
Se-methiodides and the complexes obtained from these ligands with CdCl2
have been prepared and their infrared spectra compared with the free ligands;
but it proves difficult to choose the site of coordination.
Cited by
29 articles.
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