31P CP MAS NMR studies of bis(organothiophosphoryl) disulfides. Correlation of chemical shift tensors and shielding parameters to molecular structure

1993 ◽  
pp. 63 ◽  
Author(s):  
Marek J. Potrzebowski
Keyword(s):  
Molecular Structure ◽  
Chemical Shift ◽  
Mas Nmr ◽  
Nmr Studies ◽  
Chemical Shift Tensors ◽  
Cp Mas Nmr

Phosphorus-31 chemical shift tensors of phosphinidene ligands in ruthenium carbonyl cluster compounds: A 31P single-crystal and CP/MAS-NMR study

1995 ◽  
Vol 117 (26) ◽  
pp. 6961-6969 ◽  
Author(s):  
Klaus Eichele ◽  
Roderick E. Wasylishen ◽  
John F. Corrigan ◽  
Nicholas J. Taylor ◽  
Arthur J. Carty
Keyword(s):  
Chemical Shift ◽  
Single Crystal ◽  
Mas Nmr ◽  
Cluster Compounds ◽  
Carbonyl Cluster ◽  
Chemical Shift Tensors ◽  
Nmr Study ◽  
Ruthenium Carbonyl ◽  
Cp Mas Nmr

Phosphorus-31 NMR studies of several phosphines in the solid state

1989 ◽  
Vol 67 (11) ◽  
pp. 1909-1913 ◽  
Author(s):  
Glenn H. Penner ◽  
Roderick E. Wasylishen
Keyword(s):  
Chemical Shift ◽  
Principal Components ◽  
Chemical Shift Tensor ◽  
Cross Polarization ◽  
X Ray Diffraction ◽  
Nmr Studies ◽  
Chemical Shift Tensors ◽  
X Ray ◽  
Cp Mas Nmr ◽  
Proton Decoupling

Phosphorus-31 NMR powder spectra and high resolution MAS spectra have been obtained for a number of solid phosphines under conditions of high-power proton decoupling and cross-polarization. The principal components of the 31P chemical shift tensor obtained from static powder spectra or slow MAS spectra are discussed in terms of the known structures of many of the phosphines. The CP/MAS 31PNMR spectra are used to determine the number of crystallographically nonequivalent molecules in the unit cell. The NMR results are consistent with data available from X-ray diffraction. In one case there is evidence of polymorphism. Keywords: 31P NMR of solid phosphines, principal components of 31P chemical shift tensors, crystallographic nonequivalence from 31P CP/MAS NMR.

High-Field1H MAS and15N CP-MAS NMR Studies of Alanine Tripeptides and Oligomers:  Distinction of Antiparallel and Parallel β-Sheet Structures and Two Crystallographically Independent Molecules

2007 ◽  
Vol 111 (30) ◽  
pp. 9172-9178 ◽  
Author(s):  
Yu Suzuki ◽  
Michi Okonogi ◽  
Kazuo Yamauchi ◽  
Hiromichi Kurosu ◽  
Masataka Tansho ◽  
...  
Keyword(s):  
Mas Nmr ◽  
Nmr Studies ◽  
Independent Molecules ◽  
Cp Mas Nmr ◽  
Β Sheet

13C solid state CP/MAS NMR studies of EDTA complexes

1987 ◽  
Vol 129 (2) ◽  
pp. L23-L25 ◽  
Author(s):  
Silvio Aime ◽  
Roberto Gobetto ◽  
Rita Nano ◽  
Enrica Santucci
Keyword(s):  
Solid State ◽  
Mas Nmr ◽  
Nmr Studies ◽  
Edta Complexes ◽  
Cp Mas Nmr

XRD, FTIR and 13C CP/MAS NMR Studies of Composite Comprising Poly(vinyl acetate)-Silylated Si-MCM-41

2011 ◽  
Vol 364 ◽  
pp. 159-163
Author(s):  
Izza Taib Nurul ◽  
Salasiah Endud ◽  
M. Nasir Katun
Keyword(s):  
Carbonyl Group ◽  
Vinyl Acetate ◽  
Silica Matrix ◽  
Mas Nmr ◽  
Polymer Chains ◽  
Confined Space ◽  
Nmr Studies ◽  
Solution Intercalation ◽  
Cp Mas Nmr ◽  
Mcm 41

A composite structure based on silylated MCM-41 and Poly (vinyl acetate) (PVAc) was synthesized via solution intercalation. Poly (vinyl acetate)-silylated Si-MCM-41 composite were characterized by XRD, FTIR spectroscopy and13C CP/MAS NMR in order to determine the compatibility between PVAc and the silicate host. XRD study reveals that the framework of silylated Si-MCM-41 was not altered upon incorporation of PVAc. FTIR study showed that characteristic peak assigned to carbonyl group in PVAc was observed around 1741.6 cm-1for all the composites indicating the presence of PVAc in the silylated Si-MCM-41.13C CP/MAS NMR showed the increase of line width of the peak assigned to C=O carbonyl group indicating the increase in randomness of polymer chains in confined space. The shifting of the C=O carbonyl groups is a sign of the change in chemical environment of the carbonyl owing to the interaction of PVAc with the silica matrix of silylated Si-MCM-41.

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