
%0 Journal Article
%A Devillanova, FA 
%A Verani, G 
%T An infrared investigation of Pyrrolidine-2-thione and -2-selenone
%J Australian Journal of Chemistry
%D 1978/12/01
%V 31
%N 12
%P 2609-2613
%K 
%R https://doi.org/10.1071/CH9782609
%U https://www.publish.csiro.au/paper/CH9782609 
%X Pyrrolidine-2-thione and -2-selenone together with their N-deutero and S- and Se-methiodide derivatives have been studied by i.r. spectroscopy over the range 4000-200 cm-1. C=S and C=Se contribute to the bands at around 1000 cm-1 and below 600 cm-1. In pyrrolidine-2-selenone, the band at 1005 cm-1 has been attributed to v(CSe). This value is the highest wave number for all similar pentaatomic rings, which we have previously investigated, and indicates a greater double-bond character in CSe. In the low-frequency region two bands at 497 and 334 cm-1 in pyrrolidine-2- thione and two others at 352 and 280 cm-1 in the selenium analogue are undoubtedly attributable to the C=S and C=Se modes respectively. 
