XeOCS: relatively straightforward?

Area of Science:

• Physical Chemistry
• Spectroscopy
• Computational Chemistry

Background:

• Weakly bound complexes provide insights into intermolecular forces.
• Understanding noble gas interactions with small molecules is crucial for various chemical and physical processes.
• Previous studies often assume monomer structures remain unchanged in complexes.

Purpose of the Study:

• To determine the equilibrium structure of the Xenon-Oxid કાર્બન સલ્ફાઇડ (XeOCS) complex.
• To investigate structural and binding energy trends across a series of noble gas-OCS complexes (He, Ne, Ar, Kr, Xe, Hg).
• To evaluate the validity of the rigid monomer approximation in weakly bound systems.

Main Methods:

• High-resolution microwave spectroscopy was employed to obtain benchmark-quality structural data for XeOCS.
• Extensive ab initio calculations using correlated wavefunction theory were performed for multiple noble gas-OCS complexes.
• Relativistic effects, large basis sets, and diffuse functions were incorporated in theoretical models.

Main Results:

• A precise equilibrium structure for the XeOCS complex was experimentally determined.
• Systematic trends in structural parameters and binding energies were observed across the homologous series of complexes.
• The study provides evidence regarding the extent of monomer structural changes upon complexation.

Conclusions:

• Microwave spectroscopy is a powerful tool for characterizing weakly bound complexes.
• Theoretical methods, when incorporating relativistic effects and appropriate basis sets, can accurately predict complex structures.
• The findings contribute to a deeper understanding of non-covalent interactions involving noble gases.