An infrared spectroscopic investigation on N‐methyl‐1,3‐thiazolidine‐2‐thione and ‐2‐selone

An infrared investigation cm N‐methyl‐1,3‐thiazolidine‐2‐thione and ‐2‐selone in the range 4000‐200 cm−1 is reported. The v CS and v CSe vibrations give contributions to the absorptions around 1000 cm−1 and below 600 cm−1. The assignments are supported by comparison of their ir spectra with those of S‐ and Se‐methiodides. The π‐bond orders of the thio‐ and seleno‐ketonic links in these compounds are higher than those found for 1,3‐imidazolidine‐2‐thione and ‐2‐selone.