title: Local order in fully deuterated liquid N-methylacetamide (C3D7NO) as studied by neutron diffraction and density-functional theory calculations.
abstract: A structural investigation of fully deuterated liquid N-methylacetmide (NMAd7) is performed at 308 K and atmospheric pressure by using neutron diffraction together with density-functional theory (DFT). The analysis of experimental data yields the total structure factor SM(Q), the molecular form factor F1(Q), and the distinct pair correlation function gL(r). The DFT calculations are performed to study the relative stability of the two possible isomers (trans and cis) and to examine some possible clusters recently published that may describe the intermolecular arrangement in the liquid state. Neutron measurements can be interpreted in terms of trans linear trimer (T1) and cis cyclic trimer (T2) where the total number of hydrogen bonds is respectively equal to two and three. The theoretical structure factors obtained on the basis of intermolecular arrangements agree fairly well with the experimental one beyond Q = 2 A-1. All through the study, a comparison is made with complementary X-ray results.
authors.affiliation: Laboratoire Physico-Chimie des Matériaux, Département de Physique, Faculté des Sciences de Monastir, 5019 Monastir, Tunisie.
authors.forename: Sahbi
authors.initials: S
authors.lastname: Trabelsi
authors.forename: Salah
authors.initials: S
authors.lastname: Nasr
authors.forename: Mohamed
authors.initials: M
authors.lastname: Bahri
authors.forename: Marie-Claire
authors.initials: MC
authors.lastname: Bellissent-Funel
mesh_terms: D000081:Acetamides / Q000737:chemistry*; D000465:Algorithms; D003903:Deuterium / Q000737:chemistry*; D006860:Hydrogen Bonding; D008956:Models, Chemical; D033363:Neutron Diffraction; D011789:Quantum Theory
chemical_list: D000081:Acetamides; D003903:Deuterium; C018595:N-methylacetamide