Neutron powder diffraction study of perdeuterodimethyl sulfone

Area of Science:

• Solid-state chemistry
• Crystallography
• Molecular spectroscopy

Background:

• Dimethyl sulfone is a widely used solvent.
• Understanding its solid-state structure is crucial for various chemical applications.
• Deuterated compounds offer unique insights into molecular dynamics and bonding.

Purpose of the Study:

• To refine the crystal structure of perdeuterodimethyl sulfone at cryogenic temperatures.
• To investigate the stability of its crystal structure down to liquid helium temperatures.
• To analyze the molecular geometry and intermolecular interactions in the solid state.

Main Methods:

• High-resolution neutron powder diffraction.
• Cryogenic temperature control (4.5 K).
• Crystallographic structure refinement.

Main Results:

• The crystal structure of perdeuterodimethyl sulfone was confirmed to be stable from ambient temperature down to 4.5 K.
• Key bond distances were precisely determined: S-C at 1.441 (2) Å and S-O at 1.760 (2) Å.
• The molecule exhibits distorted tetrahedral geometry with C(2v) point symmetry, linked by a network of weak hydrogen bonds in an orthorhombic structure.

Conclusions:

• Perdeuterodimethyl sulfone maintains its structural integrity at liquid helium temperatures.
• Neutron diffraction provides precise data for understanding molecular structure and hydrogen bonding.
• The findings contribute to the knowledge of sulfone chemistry and solid-state physics.