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Article
Complexation of n SO2 Molecules (n=1,2,3) with Formaldehyde and Thioformaldehyde
J. Chem. Phys.
  • L. M. Azofra
  • Steve Scheiner, Utah State University
Document Type
Article
Publication Date
1-1-2014
DOI
10.1063/1.4861432
Abstract

Ab initio and density functional theory calculations are used to examine complexes formed between H2CO and H2CS with 1, 2, and 3 molecules of SO2. The nature of the interactions is probed by a variety of means, including electrostatic potentials, natural bond orbital, atoms in molecules, energy decomposition, and electron density redistribution maps. The dimers are relatively strongly bound, with interaction energies exceeding 5 kcal/mol. The structures are cyclic, containing both a O/S⋯S chalcogen bond and a CH⋯O H-bond. Addition of a second SO2 molecule leads to a variety of heterotrimer structures, most of which resemble the original dimer, where the second SO2 molecule engages in a chalcogen bond with the first SO2, and a C⋯O attraction with the H2CX. Some cooperativity is apparent in the trimers and tetramers, with an attractive three-body interaction energy and shortened intermolecular distances.

Citation Information
Complexation of n SO2 Molecules (n=1,2,3) with Formaldehyde and Thioformaldehyde L. M. Azofra, S. Scheiner J. Chem. Phys. 2014 140 034302