Ab initio theoretical study of the interactions between CFCl3 and SO2

Area of Science:

• Computational Chemistry
• Environmental Science

Background:

• Chlorofluoromethane (CFCl3) and sulfur dioxide (SO2) are significant atmospheric pollutants.
• Understanding their interactions is crucial for atmospheric chemistry and environmental impact assessments.

Purpose of the Study:

• To investigate the stable complexes formed between CFCl3 and SO2 using theoretical calculations.
• To elucidate the nature and strength of intermolecular interactions between these molecules.

Main Methods:

• Ab initio calculations were employed to model CFCl3-SO2 complexes.
• Interaction energies were corrected for basis set superposition error and zero-point energy.
• Natural Bond Orbital (NBO) and Atoms in Molecules (AIM) analyses were used to characterize interactions.

Main Results:

• Ten stable CFCl3-SO2 complexes were identified.
• Key interactions include Cl...O, F...O, Cl...S, and F...S.
• Non-covalent bonds, specifically Cl...O and Cl...S, were found to be the dominant forces.

Conclusions:

• The study provides a detailed understanding of CFCl3-SO2 complexation.
• Identified interactions offer valuable data for studying environmental problems, including the greenhouse effect.