title: Three centered hydrogen bonds of the type C=O···H(N)···X-C in diphenyloxamide derivatives involving halogens and a rotating CF3 group: NMR, QTAIM, NCI and NBO studies.
abstract: The existence of three centered C=O···H(N)···X-C hydrogen bonds (H-bonds) involving organic fluorine and other halogens in diphenyloxamide derivatives has been explored by NMR spectroscopy and quantum theoretical studies. The three centered H-bond with the participation of a rotating CF3 group and the F···H-N intramolecular hydrogen bonds, a rare observation of its kind in organofluorine compounds, has been detected. It is also unambiguously established by a number of one and two dimensional NMR experiments, such as temperature perturbation, solvent titration, (15)N-(1)H HSQC, and (19)F-(1)H HOESY, and is also confirmed by theoretical calculations, such as quantum theory of atoms in molecules (QTAIM), natural bond orbital (NBO) and non-covalent interaction (NCI).
authors.affiliation: NMR Research Centre, Indian Institute of Science, Bangalore 560012, India. nsp@sif.iisc.ernet.in.
authors.forename: A
authors.initials: A
authors.lastname: Lakshmipriya
authors.forename: Sachin
authors.initials: S
authors.lastname: Rama Chaudhari
authors.forename: Abhishek
authors.initials: A
authors.lastname: Shahi
authors.forename: E
authors.initials: E
authors.lastname: Arunan
authors.forename: N
authors.initials: N
authors.lastname: Suryaprakash