title: Hydrogen bonding in the hydroxysulfinyl radical-formic acid-water system: A theoretical study.
abstract: Quantum chemical methods have been employed to evaluate the possible configurations of the 1:1 and 1:2 HOSO-formic acid complexes and 1:1:1 HOSO-formic acid-water complexes. The first type of complex involves two H bonds, while the other two types comprise three H bonds in a ring. The complexes are relatively stable, with CBS-QB3 computed binding energies of 14.3 kcal mol(-1) , 23.4 kcal mol(-1) , and 21.1 kcal mol(-1) for the lowest-energy structures of the 1:1, 1:2, and 1:1:1 complexes, respectively. Complex formations induce a large spectral red-shift and an enhancement of the IR intensity for the H-bonded OH stretching modes relative to those in the parent monomers. TDDFT calculations of the low-lying electronic excited states demonstrate that the complexes are photochemically quite stable in the troposphere. Small spectral shifts in comparison to the free HOSO radical suggest that the radical and the complexes would not be easily distinguishable using standard UV/vis absorption spectroscopy. © 2016 Wiley Periodicals, Inc.
authors.affiliation: Department of Physical and Organic Chemistry, Jožef Stefan Institute, Jamova c. 39, Ljubljana, SI-1000, Slovenia.|Faculty of Chemistry and Chemical Technology, University of Ljubljana, Večna Pot 113, Ljubljana, SI-1000, Slovenia.
authors.forename: Simona
authors.initials: S
authors.lastname: Tušar
authors.affiliation: Department of Physical and Organic Chemistry, Jožef Stefan Institute, Jamova c. 39, Ljubljana, SI-1000, Slovenia.
authors.forename: Antonija
authors.initials: A
authors.lastname: Lesar
keywords: formic acid; hydrogen-bonded complexes; hydroxysulfinyl radical; nucleation precursors; quantum chemical calculations