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Sulfamoyl nitrenes: singlet or triplet ground state?

Author:
LuThese authors contributed equally., Yan, Li, Hongmin, Abe, Manabu, Bégué, Didier, Wan, Huabin, Deng, Guohai, Xu, Jian, Liu, Kun, Zeng, Xiaoqing
Source:
Chemical communications 2018 v.54 no.48 pp. 6136-6139
ISSN:
1364-548X
Subject:
azides, energy, photolysis, spectroscopy
Abstract:
Unlike a triplet spin-state for alkyl- and aryl-sulfonylnitrenes, theoretical computations suggest a closed-shell singlet (CSS) ground state for simple sulfamoylnitrenes R₂NS(O)₂–N (R = H and Me) due to intramolecular N⋯N interactions. Experimentally, both sulfamoylnitrenes, generated in the laser photolysis of the corresponding azides, were isolated in the triplet state as evidenced by EPR (5 K) and IR (3 K) spectroscopy. The formation of the higher-energy triplet state is reasonably explained by a change of spin from the initially generated CSS state through a low-energy minimum energy crossing point (MECP).
Agid:
6175314