In this work, we report on the first x-ray diffraction study on liquid dimethyl carbonate. Diffraction spectra were collected with an energy-dispersive instrument, whose wide Q-range allows the structure determination of weakly ordered systems (such as liquids). The structural correlation in this liquid ranges up to about 20 A degrees. The observed patterns are interpreted with a structural model derived from classical molecular dynamics simulations. The simulations were run using OPLS force field, only slightly modified to restrain bond distances to the experimental values. The model structure function and radial distribution functions, averaged among the productive trajectory frames, are in very good agreement with the corresponding experimental ones. Molecular dynamics results show that the deviations from C-2v cis-cis structure, predicted by ab initio calculations and observed by electron diffraction in the gas phase, are small. By analyzing the intra- and intermolecular pair distribution functions, it was possible to assign the peaks of the experimental radial distribution function to specific structural correlations, and to compute the different average intermolecular coordination numbers. The intermolecular methyl-carbonyl oxygen distance is thoroughly discussed to assess the presence of weak C-H center dot center dot O hydrogen bonds.

Gontrani, L., Russina, O., Marincola, F.c., Caminiti, R. (2009). An energy dispersive x-ray scattering and molecular dynamics study of liquid dimethyl carbonate. THE JOURNAL OF CHEMICAL PHYSICS, 131(24) [10.1063/1.3273847].

An energy dispersive x-ray scattering and molecular dynamics study of liquid dimethyl carbonate

Gontrani, Lorenzo
;
2009-01-01

Abstract

In this work, we report on the first x-ray diffraction study on liquid dimethyl carbonate. Diffraction spectra were collected with an energy-dispersive instrument, whose wide Q-range allows the structure determination of weakly ordered systems (such as liquids). The structural correlation in this liquid ranges up to about 20 A degrees. The observed patterns are interpreted with a structural model derived from classical molecular dynamics simulations. The simulations were run using OPLS force field, only slightly modified to restrain bond distances to the experimental values. The model structure function and radial distribution functions, averaged among the productive trajectory frames, are in very good agreement with the corresponding experimental ones. Molecular dynamics results show that the deviations from C-2v cis-cis structure, predicted by ab initio calculations and observed by electron diffraction in the gas phase, are small. By analyzing the intra- and intermolecular pair distribution functions, it was possible to assign the peaks of the experimental radial distribution function to specific structural correlations, and to compute the different average intermolecular coordination numbers. The intermolecular methyl-carbonyl oxygen distance is thoroughly discussed to assess the presence of weak C-H center dot center dot O hydrogen bonds.
2009
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore CHIM/02 - CHIMICA FISICA
English
Con Impact Factor ISI
ab initio calculations; hydrogen bonds; liquid structure; liquid theory; molecular dynamics method; organic compounds; X-ray scattering
Gontrani, L., Russina, O., Marincola, F.c., Caminiti, R. (2009). An energy dispersive x-ray scattering and molecular dynamics study of liquid dimethyl carbonate. THE JOURNAL OF CHEMICAL PHYSICS, 131(24) [10.1063/1.3273847].
Gontrani, L; Russina, O; Marincola, Fc; Caminiti, R
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/294088
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