Molecular Orbitals Strictly Localized on Small Molecular Fragments from X-ray Diffraction Data

Area of Science:

• Quantum chemistry
• Solid-state physics
• Crystallography

Background:

• Electron density is crucial for understanding molecular electronic structure.
• Accurate determination of electron density from X-ray diffraction data is increasingly important.
• Current methods often lack chemical interpretability or quantum mechanical rigor.

Purpose of the Study:

• To develop a new strategy for charge density analysis.
• To combine the chemical interpretability of the multipole model with the rigor of wave function-based methods.
• To extract localized molecular orbitals from experimental X-ray diffraction data.

Main Methods:

• Developing a novel charge density analysis strategy.
• Combining multipole model interpretability with wave function rigor.
• Extracting localized molecular orbitals from measured structure factor amplitudes.

Main Results:

• A straightforward method for determining localized molecular orbitals was developed.
• Preliminary tests confirmed the reliability and transferability of these orbitals.
• The approach successfully integrates experimental data with theoretical rigor.

Conclusions:

• The proposed technique offers a chemically interpretable and quantum mechanically rigorous approach to charge density analysis.
• The extracted localized molecular orbitals show reliable transferability.
• This method paves the way for creating new databases of localized molecular orbitals as an alternative to pseudoatom libraries.