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Accurate charge density of small α-glycine by the maximum entropy method

Titelangaben

Netzel, Jeanette ; Hofmann, Andreas ; van Smaalen, Sander:
Accurate charge density of small α-glycine by the maximum entropy method.
In: CrystEngComm. Bd. 10 (2008) Heft 3 . - S. 335-343.
ISSN 1466-8033
DOI: https://doi.org/10.1039/B711064B

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Projektfinanzierung: Deutsche Forschungsgemeinschaft

Abstract

Accurate electron densities of small α-glycine have been obtained by the maximum entropy method (MEM) applied to low-temperature X-ray diffraction data by Destro et al. (J. Phys. Chem. A{,} 2000{,} 104{,} 1047-1054). Difference Fourier maps have been found to provide a good stopping criterion for the iterations in the MEM{,} in agreement with our previous findings for trialanine. Properties according to Bader{'}s atoms-in-molecules theory are reported for the MEM electron density. These properties are found to be in agreement with the properties of the MEM electron density as they have been obtained previously for the tripeptide trialanine{,} thus showing the consistency of the MEM approach when applied to centrosymmetric and acentric organic compounds. The dynamic MEM electron density compares favourably with the static electron density obtained from the multipole model by Destro et al. (2000){,} with differences being attributed to the specific nature of each method. The independent spherical atom model (ISAM) and the multipole model provide different phases for 17 reflections of which only two are of the type {'}observed{'}. A MEM calculation with reflection phases from the multipole model leads to an electron density that is only marginally different from the MEM electron density with phases from the ISAM refinement. This suggests{,} at least for centrosymmetric structures{,} that the ISAM is sufficiently good to be used as basis for the MEM approach to accurate electron density studies.

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Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Institutionen der Universität: Fakultäten > Fakultät für Mathematik, Physik und Informatik > Fachgruppe Materialwissenschaften > Lehrstuhl Kristallographie
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Fachgruppe Materialwissenschaften > Lehrstuhl Kristallographie > Lehrstuhl Kristallographie - Univ.-Prof. Dr. Sander van Smaalen
Fakultäten
Fakultäten > Fakultät für Mathematik, Physik und Informatik
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Fachgruppe Materialwissenschaften
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Eingestellt am: 24 Nov 2015 09:23
Letzte Änderung: 24 Nov 2015 09:23
URI: https://eref.uni-bayreuth.de/id/eprint/22949