Validation of X-ray Wavefunction Refinement

Woińska, Magdalena; Jayatilaka, Dylan; Dittrich, Birger; Flaig, Ralf; Luger, Peter; Woźniak, Krzysztof; Dominiak, Paulina M.; Grabowsky, Simon (2017). Validation of X-ray Wavefunction Refinement. ChemPhysChem, 18(23), pp. 3334-3351. Wiley-VCH 10.1002/cphc.201700810

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In this work, the quality of the electron density in crystals reconstructed by the multipolar model (MM) and by X-ray wavefunction refinement (XWR) is tested on a set of high-resolution X-ray diffraction data sets of four amino acids and six tripeptides. It results in the first thorough validation of XWR. Agreement statistics, figures of merit, residual- and deformation-density maps, as well as atomic displacement parameters are used to measure the quality of the reconstruction relative to the measured structure factors. Topological analysis of the reconstructed density is carried out to obtain atomic and bond-topological properties, which are subsequently compared to the values derived from benchmarking periodic DFT geometry optimizations. XWR is simultaneously in better agreement than the MM with both benchmarking theory and the measured diffraction pattern. In particular, the obvious problems with the description of polar bonds in the MM are significantly reduced by using XWR. Similarly, modeling of electron density in the vicinity of hydrogen atoms with XWR is visibly improved.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Grabowsky, Simon

Subjects:

500 Science > 570 Life sciences; biology
500 Science > 540 Chemistry

ISSN:

1439-4235

Publisher:

Wiley-VCH

Language:

English

Submitter:

Simon Grabowsky

Date Deposited:

06 Feb 2020 09:53

Last Modified:

06 Feb 2020 09:53

Publisher DOI:

10.1002/cphc.201700810

BORIS DOI:

10.7892/boris.138423

URI:

https://boris.unibe.ch/id/eprint/138423

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