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The photoelectron and microwave spectra of the unstable species thioacetaldehyde, CH3CHS, and thioacetone, (CH3)2CS

✍ Scribed by H.W. Kroto; B.M. Landsberg; R.J. Suffolk; A. Vodden

Publisher: Elsevier Science
Year: 1974
Tongue: English
Weight: 523 KB
Volume: 29
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(74)85029-3

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✦ Synopsis

Combined photoelectron

and microwave techniques have been used to study the unstable species thioacetaldehyde, CHq,CHS, and thioacetone, (CH&CS. These species are produced when their re.spective cyclic trimers, 1,3,5-trimethyl s-trithiane and hexamethyl s-trithiane, are pyrolyzed. The trimer vapours are flowed at approximetely 30~ Hg pressure tiaa quarts tube heated to between 500 and 600°C into a photoelectron or microwave spectroneter. Under these low pressure conditions the lifetime of CHaCHS was abou. * 10 seconds. The lifetime of (CHs)sCS was much longer, of the order of several minutes.

The first (vertical) ionization potentials of thioacetaldchyde and thioacetone are 8.98 i 0.02 eV and 8.60 f 0.05 eV respectively. The photoeLectron spectra of the parent trimers have also been studied as well as s-trithkne, the triner of thioformaldehyde. The microwave rotational spectra show evidence of hindered internal rotation. Pre!iW analyses indicate that in thioacetaldehyde the barrier is 154.5 k 20 ul per mole (6470 joule per mole) UK! ii7 tkiioacetone it is 1300 * 50 Cal per mole (5440 joule per mole).

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