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H-Bonding network in fully deuterated N-methylformamide-water mixtures as studied by neutron scattering.
Abir Chebaane1, Ferid Hammami, Salah Nasr
1Laboratoire Physico-Chimie des Matériaux, Département de Physique, Faculté des Sciences de Monastir, Tunis, 5000, Tunisie.
Abstract:
In complementarity with X-ray scattering and as extension of our previous publication, neutron scattering measurements are combined to DFT calculation to investigate the structural features of N-methylformamide-water mixtures (NMF-water) for three water molar fractions x w = 0.5 , 0.66 and x w = 0.75 . The recorded data at atmospheric pressure and room temperature are analyzed to yield the structure factor, the molecular form factor and the pair correlation function. Neutron investigations corroborate the X-ray ones and clearly show that liquid order in solutions is well accounted for by a tetramer. In this cluster, an NMF molecule is connected to three water molecules by one N-D···O and two O-D···O hydrogen bonds.
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