title: N-Heterocyclic carbene stabilized parent sulfenyl, selenenyl, and tellurenyl cations (XH+, X = S, Se, Te).
abstract: NHC-stabilized parent sulfenyl (H-S+), selenenyl (H-Se+) and tellurenyl (H-Te+) cations have been achieved by treatment of NHC chalcogen adducts with trifluoromethanesulfonic acid. Computational investigations show that most of the positive charges are localized at chalcogen atoms and carbene carbons with strong donor acceptor interactions between the lone pair of chalcogen atoms and the vacant orbital of the carbene centre, accounting for its unexpected stability.
authors.affiliation: Department of Chemistry, University of Toronto, 80 St. George St, Toronto, Ontario, Canada M5S 3H6. dstephan@chem.utoronto.ca.
authors.forename: Liu Leo
authors.identifier: http://orcid.org/0000-0003-4934-0367
authors.initials: LL
authors.lastname: Liu
authors.affiliation: Department of Chemistry, University of Toronto, 80 St. George St, Toronto, Ontario, Canada M5S 3H6. dstephan@chem.utoronto.ca.
authors.forename: Diya
authors.initials: D
authors.lastname: Zhu
authors.affiliation: Department of Chemistry, University of Toronto, 80 St. George St, Toronto, Ontario, Canada M5S 3H6. dstephan@chem.utoronto.ca.
authors.forename: Levy L
authors.initials: LL
authors.lastname: Cao
authors.affiliation: Department of Chemistry, University of Toronto, 80 St. George St, Toronto, Ontario, Canada M5S 3H6. dstephan@chem.utoronto.ca.
authors.forename: Douglas W
authors.identifier: http://orcid.org/0000-0001-8140-8355
authors.initials: DW
authors.lastname: Stephan