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Issue 30, 2012
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Nanosecond time-resolved IR study of thiobenzoylnitrene

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Abstract

Nanosecond time-resolved infrared (TRIR) spectroscopy has been used to observe singlet thiobenzoylnitrene at 1740 cm−1 upon photolysis of 5-phenyl-1,2,3,4-thiatriazole in acetonitrile and dichloromethane. Consistent with the experimental observations, thiobenzoylnitrene is predicted by B3LYP/6-31G* calculations to have a singlet ground state with an intense IR band at 1752 cm−1. Phenyl isothiocyanate is also produced. Kinetic measurements indicate that it is not formed from singlet thiobenzoylnitrene, but rather directly from the thiatriazole. Unlike benzoylnitrene, singlet thiobenzoylnitrene does not react with acetonitrile or dichloromethane on the nanosecond timescale. However, it does react with dimethyl sulfoxide (DMSO) to produce a sulfoximine detected at 1180 cm−1 (kDMSO = 3 × 105 M−1 s−1). Benzonitrile (observed at 2230 cm−1) is produced from both singlet thiobenzoylnitrene (presumably through a short-lived, unobservable benzonitrile sulfide intermediate) and directly from the thiatriazole. B3LYP/6-31G* calculations also show that the structure of singlet thiobenzoylnitrene is analogous to that of related acylnitrenes, with a significant bonding interaction between the nitrogen and sulfur. Triplet thiobenzoylnitrene, on the other hand, is predicted computationally to have a biradical structure.

Graphical abstract: Nanosecond time-resolved IR study of thiobenzoylnitrene

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Supplementary files

Article information


Submitted
02 Feb 2012
Accepted
19 Mar 2012
First published
20 Mar 2012

Phys. Chem. Chem. Phys., 2012,14, 10438-10444
Article type
Paper

Nanosecond time-resolved IR study of thiobenzoylnitrene

Y. Liu, A. S. Evans and J. P. Toscano, Phys. Chem. Chem. Phys., 2012, 14, 10438
DOI: 10.1039/C2CP40327G

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