13C NMR Study of Oxygen Intercalation in C60

1994 ◽  
Vol 359 ◽  
Author(s):  
P. Bernier ◽  
I. Luk'yanchuk ◽  
Z. Belahmer ◽  
M. Ribet ◽  
L. Firlej
Keyword(s):  
Charge Transfer ◽  
High Resolution ◽  
Molecular Oxygen ◽  
13C Nmr ◽  
Octahedral Site ◽  
Magnetic Characteristics ◽  
Nmr Study ◽  
Oxygen Intercalation ◽  
Fcc Structure ◽  
C Nmr

ABSTRACTHigh resolution 13C NMR has been used to investigate the properties of solid C60 after intercalation of molecular oxygen, which does not induce charge transfer with the host molecules. We show that, via the magnetic characteristics of the intercalant, information can be gained on its position and movement in the structure. In particular, molecular oxygen is found to occupy the middle of the octahedral site in the fcc structure of solid C60.

13C NMR study of the mixture MBBA/EBBA/decane: The influence of decane on the molecular ordering in the nematic phase

1989 ◽  
Vol 54 (4) ◽  
pp. 868-877
Author(s):  
Josef Šebek ◽  
Raivo Teeaar
Keyword(s):  
Nmr Spectroscopy ◽  
High Resolution ◽  
Internal Rotation ◽  
13C Nmr ◽  
Nematic Phase ◽  
Temperature Behaviour ◽  
Nmr Study ◽  
Molecular Ordering ◽  
Conformational Order ◽  
C Nmr

Influence of various amounts of decane dissolved in the eutectic nematic mixture in methoxybenzylidenebutylaniline and ethoxybenzylidenebutylaniline (MBBA/EBBA) on the ordering and structure of mesomorphic molecules has been determined employing high-resolution proton enhanced 13C NMR spectroscopy. The obtained results are compared with temperature behaviour of the ordering and structure of EBBA studied by means of the same technique. Slight differences in the ordering of the phenyl parts of molecules in the dependence on temperature and on decane concentration have been observed. This contrasts with great differences observed in the behaviour of the butyl parts of mesogenic molecules. Two possible explanation of the behaviour of butyl chain atoms in the dependence on decane concentration are presented. According to one approach, conformational order parameters of the first butyl carbons increase with the increasing decane concentration. Another possibility is that decane increases the correlation between the whole molecule rotation and the internal rotation around the first butyl bond.

A Novel Method for 13C-NMR Spectroscopy of Polymer in Emulsion: Quantitative Analysis of Microstructure of Crosslinked Polybutadiene in Latex

1999 ◽  
Vol 72 (5) ◽  
pp. 844-853 ◽  
Author(s):  
Seiichi Kawahara ◽  
Saori Bushimata ◽  
Takashi Sugiyama ◽  
Chihiro Hashimoto ◽  
Yasuyuki Tanaka
Keyword(s):  
Nmr Spectroscopy ◽  
High Resolution ◽  
13C Nmr ◽  
Lattice Relaxation ◽  
13C Nmr Spectroscopy ◽  
Lattice Relaxation Time ◽  
Solid Sample ◽  
Spin Lattice Relaxation ◽  
High Resolution Spectrum ◽  
C Nmr

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.

scholarly journals Evidence of the Existence of 2:1 Guest–Host Complexes between Diclofenac and Cyclodextrins in D2O Solutions. A 1H and 13C NMR Study on Diclofenac/β-Cyclodextrin and Diclofenac/2-Hydroxypropyl-β-cyclodextrin Systems

1999 ◽  
Vol 23 (7) ◽  
pp. 414-415
Author(s):  
Adele Mucci ◽  
Luisa Schenetti ◽  
Maria A. Vandelli ◽  
Barbara Ruozi ◽  
Flavio Forni
Keyword(s):  
13C Nmr ◽  
Sodium Salt ◽  
Multiple Equilibria ◽  
Diclofenac Sodium ◽  
1H And 13C Nmr ◽  
Nmr Study ◽  
Nmr Techniques ◽  
Nmr Titrations ◽  
C Nmr

The interaction of diclofenac sodium salt (DCFNa) and two cyclodextrins, β-cyclodextrin (βCD) and 2-hydroxypropyl-β-cyclodextrin (HPβCD), studied in D2O solution with different NMR techniques (1H, 13C NMR, ROESY experiments, NMR titrations), shows the existence of multiple equilibria involving 1:1 and 2:1 guest–host complexes.

High-resolution solid-state C NMR study of per(3,6-anhydro)-α-cyclodextrin based polymers and of their chromium complexes

2005 ◽  
Vol 61 (1) ◽  
pp. 88-94 ◽  
Author(s):  
S CADARS ◽  
M FORAY ◽  
A GADELLE ◽  
G GERBAUD ◽  
M BARDET
Keyword(s):  
Solid State ◽  
High Resolution ◽  
Chromium Complexes ◽  
Nmr Study ◽  
C Nmr

scholarly journals Curing Reactions of Bismaleimide Resins Catalyzed by Triphenylphosphine. High Resolution Solid-State 13C NMR Study

1996 ◽  
Vol 28 (9) ◽  
pp. 752-757 ◽  
Author(s):  
Sumio Shibahara ◽  
Takashi Enoki ◽  
Takahisa Yamamoto ◽  
Jiro Motoyoshiya ◽  
Sadao Hayashi
Keyword(s):  
Solid State ◽  
High Resolution ◽  
13C Nmr ◽  
Nmr Study ◽  
Bismaleimide Resins ◽  
Solid State 13C Nmr
Sign in / Sign up

Export Citation Format

Share Document