Intermolecular associations in an equimolar formamide-water solution based on neutron scattering and DFT calculations

Area of Science:

• Physical Chemistry
• Computational Chemistry
• Materials Science

Background:

• Understanding molecular interactions in solutions is crucial for various chemical processes.
• Formamide-water mixtures are relevant in diverse applications, necessitating detailed structural insights.

Purpose of the Study:

• To investigate the intermolecular associations between formamide and water in an equimolar solution.
• To elucidate the local ordering and hydrogen bonding characteristics within formamide-water mixtures.

Main Methods:

• Neutron scattering experiments were employed to obtain structural information.
• Density functional theory (DFT) calculations were used to model molecular interactions.
• Analysis of structure factor S_M(q) and pair correlation function g_L(r) provided insights.
• Natural bond orbital (NBO) and atoms in molecules (AIM) analyses were performed.

Main Results:

• Specific hydrogen-bonded formamide-water associations were identified as key contributors to local order.
• Neutron scattering data analysis revealed the structure factor and intermolecular pair correlation function.
• Computational analyses confirmed the properties of hydrogen bonds in probable structural models.

Conclusions:

• The study successfully characterized the intermolecular associations in formamide-water solutions.
• Identified hydrogen bonding patterns significantly influence the local structure of the mixture.
• Combined experimental and computational approaches provide a comprehensive understanding of the solution's molecular organization.