title: Determination of the dihedral angle of the monoanion of succinic acid in aprotic media.
abstract: A value of 74(+/-4) degrees was determined from NMR-observed dipolar couplings for the rotational dihedral angle of the monosuccinate anion in an aprotic liquid-crystal solution of the gauche conformation of tetraoctylammonium monosuccinate. This value is in reasonable agreement with other, somewhat less definitive, evidence gleaned from isotropic vicinal proton-proton couplings of the essentially completely gauche preference of the monosuccinate anion in tert-butyl alcohol and aprotic solvents, such as DMSO and THF, and quantum computations for the monoanion in THF.
authors.affiliation: California Institute of Technology, 1200 East California Blvd. Pasadena, California 91125, USA.
authors.forename: Albert A
authors.initials: AA
authors.lastname: Smith
authors.forename: Michael D
authors.initials: MD
authors.lastname: Drake
authors.forename: Andreas K
authors.initials: AK
authors.lastname: Rahim
authors.forename: John D
authors.initials: JD
authors.lastname: Roberts
mesh_terms: D050866:Liquid Crystals / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D019802:Succinic Acid / Q000737:chemistry*
chemical_list: D000644:Quaternary Ammonium Compounds; D019802:Succinic Acid