Variable-temperature high-pressure investigation of the cobalt-59 NMR spectroscopy of aqueous K3[Co(CN)6]

2001 ◽  
Vol 40 (1) ◽  
pp. 57-64 ◽  
Author(s):  
D. G. Gillies ◽  
L. H. Sutcliffe ◽  
A. J. Williams
Keyword(s):  
High Pressure ◽  
Nmr Spectroscopy ◽  
Variable Temperature

Intermolecular Interactions of Xe Atoms Confined in One-dimensional Nanochannels of Tris(o-phenylenedioxy)cyclotriphosphazene as Studied by High-pressure 129Xe NMR

2003 ◽  
Vol 58 (12) ◽  
pp. 727-734 ◽  
Author(s):  
Hirokazu Kobayashi ◽  
Takahiro Ueda ◽  
Keisuke Miyakubo ◽  
Taro Eguchi
Keyword(s):  
High Pressure ◽  
Nmr Spectroscopy ◽  
Chemical Shift ◽  
Pressure Dependence ◽  
Average Distance ◽  
Chemical Shift Tensor ◽  
Axially Symmetric ◽  
One Dimensional ◽  
129Xe Nmr ◽  
The One

The pressure dependence of the 129Xe chemical shift tensor confined in the Tris(o-phenylenedioxy) cyclotriphosphazene (TPP) nanochannel was investigated by high-pressure 129Xe NMR spectroscopy. The observed 129Xe spectrum in the one-dimensional TPP nanochannel (0.45 nm in diameter) exhibits a powder pattern broadened by an axially symmetric chemical shift tensor. As the pressure increases from 0.02 to 7.0 MPa, a deshielding of 90 ppm is observed for the perpendicularcomponent of the chemical shift tensor δ⊥, whereas a deshielding of about 30 ppm is observed for the parallel one, δ‖. This suggests that the components of the chemical shift tensor, δ‖ and δ⊥, are mainly dominated by the Xe-wall and Xe-Xe interaction, respectively. Furthermore, the effect of helium, which is present along with xenon gas, on the 129Xe chemical shift is examined in detail. The average distance between the Xe atoms in the nanochannel is estimated to be 0.54 nm. This was found by using δ⊥ at the saturated pressure of xenon, and comparing the increment of the chemicalshift value in δ⊥ to that of a β -phenol/Xe compound.

scholarly journals Monitoring Unfolding of Titin I27 Single and Bi Domain with High-Pressure NMR Spectroscopy

2018 ◽  
Vol 115 (2) ◽  
pp. 341-352 ◽  
Author(s):  
Isaline Herrada ◽  
Philippe Barthe ◽  
Marisa Vanheusden ◽  
Karine DeGuillen ◽  
Léa Mammri ◽  
...  
Keyword(s):  
High Pressure ◽  
Nmr Spectroscopy

High-pressure variable temperature Raman studies on hexamethyl benzene crystals

1978 ◽  
Vol 7 (1) ◽  
pp. 49-53 ◽  
Author(s):  
J. S. Bodenheimer ◽  
W. F. Sherman ◽  
G. R. Wilkinson
Keyword(s):  
High Pressure ◽  
Variable Temperature ◽  
Pressure Variable

Lifting of the Degeneracy in Semibullvalenes by Remote and Direct Substituents:  A Quantitative Study Using Variable-Temperature Carbon-13 NMR Spectroscopy†

2001 ◽  
Vol 66 (6) ◽  
pp. 1949-1960 ◽  
Author(s):  
Markus Heubes ◽  
Thomas Dietz ◽  
Helmut Quast ◽  
Maximilian Seefelder ◽  
Alexander Witzel ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Quantitative Study ◽  
Variable Temperature

scholarly journals Spin State Behavior of A Spin-Crossover Iron(II) Complex with N,N′-Disubstituted 2,6-bis(pyrazol-3-yl)pyridine: A Combined Study by X-ray Diffraction and NMR Spectroscopy

Crystals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 793
Author(s):  
Elizaveta K. Melnikova ◽  
Dmitry Yu. Aleshin ◽  
Igor A. Nikovskiy ◽  
Gleb L. Denisov ◽  
Yulia V. Nelyubina
Keyword(s):  
Nmr Spectroscopy ◽  
Spin State ◽  
Metal Ion ◽  
Spin Crossover ◽  
Molecular Design ◽  
Chemical Shifts ◽  
Variable Temperature ◽  
High Spin State ◽  
X Ray Diffraction ◽  
X Ray

A series of three different solvatomorphs of a new iron(II) complex with N,N′-disubstituted 2,6-bis(pyrazol-3-yl)pyridine, including those with the same lattice solvent, has been identified by X-ray diffraction under the same crystallization conditions with the metal ion trapped in the different spin states. A thermally induced switching between them, however, occurs in a solution, as unambiguously confirmed by the Evans technique and an analysis of paramagnetic chemical shifts, both based on variable-temperature NMR spectroscopy. The observed stabilization of the high-spin state by an electron-donating substituent contributes to the controversial results for the iron(II) complexes of 2,6-bis(pyrazol-3-yl)pyridines, preventing ‘molecular’ design of their spin-crossover activity; the synthesized complex being only the fourth of the spin-crossover (SCO)-active kind with an N,N′-disubstituted ligand.

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