Testing the limits of sensitivity in a solid-state structural investigation by combined X-ray powder diffraction,...

Area of Science:

• Solid-state chemistry
• Crystallography
• Computational chemistry

Background:

• Accurate crystal structure determination is crucial for understanding material properties.
• Solid-state Nuclear Magnetic Resonance (SS-NMR) and X-ray powder diffraction (XRPD) are key techniques for solid-state analysis.
• Molecular modeling aids in interpreting experimental data and predicting structural features.

Purpose of the Study:

• To perform a solid-state structural investigation of ethoxzolamide using a multi-technique approach.
• To refine crystal structure solutions and remove ambiguities in XRPD data analysis.
• To gain insights into non-covalent interactions and their role in supra-molecular architecture.

Main Methods:

• Combined X-ray powder diffraction (XRPD) with direct space methods.
• Utilized (13)C((15)N) solid-state Nuclear Magnetic Resonance (SS-NMR) spectroscopy.
• Employed quantum chemical computations (GIPAW method) and molecular mechanics (MM) for modeling.

Main Results:

• Successfully refined ethoxzolamide crystal structure, resolving ambiguities from XRPD data.
• Identified key non-covalent interactions driving the observed crystal packing.
• Demonstrated the methodology's accuracy in distinguishing structural features from powder diffraction data.

Conclusions:

• The multi-technique approach is effective for accurate solid-state structure determination.
• Ethoxzolamide serves as an excellent model system for validating structural analysis methodologies.
• Understanding non-covalent interactions is vital for predicting and controlling crystal structures.