Toward a quantitative description of solvation structure: a framework for differential solution scattering...

Area of Science:

• Solution chemistry
• Structural biology
• Materials science

Background:

• Understanding solute-solvent interactions is crucial for chemical dynamics in solution.
• Experimental methods are needed to complement simulations and theories.
• High-energy X-ray scattering (HEXS) offers direct structural probing at the atomic level.

Purpose of the Study:

• To develop a theoretical framework for differential solution scattering experiments in the HEXS regime.
• To enable quantitative, atomistic modeling of molecular systems in solution.
• To overcome the challenge of dominant solvent scattering signals.

Main Methods:

• Development of a theoretical framework for differential scattering experiments.
• Incorporation of concepts like solvent-excluded volume.
• Application of numerical simulations and experimental validation.
• Utilizing pair distribution function analysis with HEXS.

Main Results:

• A robust theoretical framework for differential HEXS experiments was established.
• The framework successfully addresses the challenge of bulk solvent interference.
• Numerical simulations and experimental data support the developed theory.
• Quantitative structural determination of small molecules in solution is now feasible.

Conclusions:

• Differential HEXS provides a powerful tool for atomic-resolution structural studies in solution.
• This approach enables the development of quantitative, atomistic models.
• It opens new avenues for understanding solution-phase chemistry and dynamics.
• Achieves resolution comparable to crystallographic methods for solution samples.