The Journal of Physical Chemistry A
American Chemical Society
SOF2, SOFCl, and SOCl2 were each paired with a series of N bases. The potential energy surface of the binary complexes were characterized by MP2 calculations with double and triple-ξ basis sets, extrapolated to complete sets. The most stable configurations contained a S···N chalcogen bond with interaction energies as high as 6.8 kcal/mol. These structures are stabilized by a Nlp→σ*(S−Z) electron transfer (Z = O, F, Cl), complemented by Coulombicattraction of N to theσ-hole opposite the Z atom. N···S−F and N···S−Cl chalcogen bonds are stronger than N···S = O interactions.Formation of each chalcogen bond elongates all of the internalcovalent bonds within SOXY, especially the S−Cl bond. Halogen-bonded (N···Cl−S) complexes were also observed, but these are moreweakly bound, by less than 3 kcal/mol.
azofra, l., Alkorta, I., Scheiner, S. I. (2015). Chalcogen Bonds in Complexes of SOXY (X, Y = F, Cl) with Nitrogen Bases. J. Phys. Chem. A, 119, 535-541.