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Combined powder X-ray diffraction data and quantum-chemical calculations in EXPO2014

Published online by Cambridge University Press:  21 February 2017

Angela Altomare
Institute of Crystallography (IC), National Research Council, Bari, Italy
Fulvio Ciriaco
Department of Chemistry, University of Bari, Italy
Corrado Cuocci
Institute of Crystallography (IC), National Research Council, Bari, Italy
Aurelia Falcicchio
Institute of Crystallography (IC), National Research Council, Bari, Italy
Flavio Fanelli
Institute of Crystallography (IC), National Research Council, Bari, Italy Department of Pharmacy – Drug Science, University of Bari, Italy
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This paper describes new features implemented in the EXPO2014 software and aimed at assisting crystallographers in the use of quantum-chemistry calculations in combination with experimental powder diffraction data. The implemented tools are useful in particular in two important steps of the process of crystal structure determination from powder diffraction data: (1) preparing accurate structural model suitable for crystal structure determination by real-space methods; (2) validating structure determination. The combination of experimental/quantum-chemical methods in EXPO2014 is now managed easily thanks to the following capabilities: (a) converting crystallographic data in input files and reading molecular geometry from output files of a wide variety of computational chemistry packages (GAMESS-US, NWChem, Gaussian, CRYSTAL, ABINIT, QUANTUM ESPRESSO); (b) optimizing the geometry of a molecule using Open Babel's force fields; (c) a graphical interface to run semi-empirical quantum calculation by MOPAC (Molecular Orbital PACkage); (d) producing input file for dispersion-corrected density functional theory.

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Copyright © International Centre for Diffraction Data 2017 

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