Oil fractionation as a preliminary step in the characterization of vegetable oils by high-resolution 13
C NMR spectroscopy

Abstract A novel analytical method using high resolution 13C-NMR spectroscopy to study polymer latex, which is a heterogeneous system comprising polymer dispersoid and water, is described. The appropriate concentrations of surfactant and dried rubber content of a polybutadiene latex, which give the best spectrum, were found to be 1 w/v % and 10%, respectively. The half-widths of resonance peaks for the latex sample were almost identical to the half-widths obtained in solution, which were about one-third the width of those obtained using a solid sample of either a crosslinked or soluble polybutadiene. Nevertheless, the signal to noise ratio for the latex sample was slightly smaller than that for the solution sample. The values of spin-lattice relaxation time, T1, for the latex sample were similar to those for the solid sample. These demonstrate that the latex state C-NMR spectroscopy will be a powerful technique for structural characterization of crosslinked gels in the dispersoid because it gives a high resolution spectrum comparable to solution state spectroscopy, showing short T1 values corresponding to those for solid state C-NMR spectroscopy. High resolution latex state 13C-NMR spectroscopy was used to determine the concentrations of the various isomers of the polybutadiene in the dispersoid.

Download Full-text

Characterization of New Inorganic- Organic Hybrid Compounds: (C6H10N2).Cl2 (I), [C6H10N2]2ZnCl4 (II): Crystal Structure, Hirschfield Surface, IR and NMR spectroscopy Analysis.

10.21203/rs.3.rs-803292/v1 ◽

2021 ◽

Author(s):

nejeh hannachi ◽

faouzi hlel

Keyword(s):

Nmr Spectroscopy ◽

Three Dimensional ◽

X Ray Diffraction ◽

Spectroscopy Analysis ◽

Absorption Bands ◽

Monoclinic System ◽

Xrd Pattern ◽

Organic Hybrid ◽

C Nmr

Abstract Two new organic-inorganic hybrid materials, (C6H10N2).Cl2 (I) and [C6H10N2]2ZnCl4 (II), have been synthesized by hydrothermal method and characterized by single-crystal X-ray diffraction and XRD pattern investigations. These two compounds are crystallized in the monoclinic system; C2/c space group. In the both structures, the anionic-cationic entities are interconnected by hydrogen bonding contacts and p-p Interaction forming three-dimensional networks. Intermolecular interactions were investigated by Hirshfeld surfaces and the contacts of the four different chloride atoms in (II) were compared. The vibrational absorption bands were identified by infrared spectroscopy. These compounds were also investigated by solid state 13C NMR spectroscopy.

Download Full-text

Structural characterization of polypyrrole in the solid state by high resolution 15N NMR spectroscopy combined with quantum chemistry

Journal of Molecular Structure ◽

10.1016/0022-2860(92)80015-a ◽

1992 ◽

Vol 269 (1-2) ◽

pp. 183-195 ◽

Cited By ~ 25

Author(s):

Mizuyo Kikuchi ◽

Hiromichi Kurosu ◽

Isao Ando

Keyword(s):

Solid State ◽

Nmr Spectroscopy ◽

High Resolution ◽

Quantum Chemistry ◽

Structural Characterization ◽

15N Nmr ◽

15N Nmr Spectroscopy

Download Full-text

Structural Characterization of Zeolites by High Resolution Magic-Angle-Spinning Solid State 29Si-NMR Spectroscopy

Zeolites: Science and Technology ◽

10.1007/978-94-009-6128-9_7 ◽

1984 ◽

pp. 193-210 ◽

Cited By ~ 5

Author(s):

Zelimir Gabelica ◽

Janos B. Nagy ◽

Philippe Bodart ◽

Guy Debras ◽

Eric G. Derouane ◽

...

Keyword(s):

Solid State ◽

Nmr Spectroscopy ◽

High Resolution ◽

Structural Characterization ◽

Magic Angle Spinning ◽

Magic Angle ◽

29Si Nmr ◽

Angle Spinning ◽

29Si Nmr Spectroscopy

Download Full-text

Efficient resolution of racemic crown-shaped cyclotriveratrylene derivatives and isolation and characterization of the intermediate saddle isomer

Beilstein Journal of Organic Chemistry ◽

10.3762/bjoc.15.133 ◽

2019 ◽

Vol 15 ◽

pp. 1339-1346

Author(s):

Sven Götz ◽

Andreas Schneider ◽

Arne Lützen

Keyword(s):

High Performance Liquid Chromatography ◽

Liquid Chromatography ◽

Nmr Spectroscopy ◽

High Performance ◽

Chiral Stationary Phase ◽

Hplc Separation ◽

Promising Alternative ◽

Isolation And Characterization ◽

C Nmr

The preparative resolution of a trifunctionalized C 3-symmetrical chiral cyclotriveratrylene derivative was achieved via high-performance liquid chromatography (HPLC) on a chiral stationary phase. This approach is a promising alternative to the previously reported resolution through formation of diastereomeric esters because it involves fewer synthetic steps and is less prone to thermal (re)racemization. During these studies an intermediate saddle conformer could also be isolated and characterized by 1H and 13C NMR spectroscopy. The HPLC separation method was further developed in order to allow investigations on the racemization behavior of the cyclotriveratrylene derivative.

Download Full-text