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Structural analysis and multipole modelling of quercetin monohydrate--a quantitative and comparative study
Sławomir Domagała1, Parthapratim Munshi, Maqsood Ahmed
1Laboratoire de Cristallographie, Résonance Magnétique et Modélizations (CRM2), CNRS, UMR 7036, Institut Jean Barriol, Faculté des Sciences et Techniques, Nancy Université, BP 70239, 54506 Vandoeuvre-lès-Nancy CEDEX, France.
Acta Crystallographica. Section B, Structural Science
|January 20, 2011
Summary
The multipolar atom model, using transferred charge-density data, accurately refines crystal structures. This method enhances atomic details and crystallographic metrics, even without high-resolution diffraction data.
Area of Science:
- Crystallography
- Materials Science
- Quantum Chemistry
Background:
- The independent atom model is widely used but has limitations in accuracy.
- Multipolar atom models offer a more detailed description of electron density.
- Transferring charge-density parameters provides a practical way to construct multipolar models.
Purpose of the Study:
- To evaluate the effectiveness of the transferred multipolar atom model approach for crystal structure refinement.
- To compare the accuracy of the multipolar model with the independent atom model.
- To assess the applicability of database transfer for multipolar electron density features.
Main Methods:
- X-ray diffraction data collection for quercetin monohydrate.
- Construction of multipolar atom models using transferred charge-density parameters from a database.
- Comparison of results from transferred multipolar models and periodic quantum mechanical calculations.
- Analysis of atomic positions, atomic displacement parameters, residual electron densities, and crystallographic figures of merit.
Main Results:
- The transferred multipolar atom model significantly improved the accuracy of atomic positions and atomic displacement parameters.
- Residual electron densities and crystallographic figures of merit were notably enhanced.
- Charge-density features, topological analysis, and electrostatic interaction energies showed good agreement between database transfer and quantum mechanical calculations.
- The approach proved accurate even in the absence of high-resolution diffraction data.
Conclusions:
- The transferred multipolar atom model is an effective and accurate replacement for the independent atom model in crystal structure analysis.
- Database transfer of charge-density parameters is a reliable method for constructing accurate multipolar models.
- This approach is particularly valuable when high-resolution diffraction data is unavailable, enabling precise determination of electron density features.
