NMR studies of H2 single crystals. VI. Line shapes in the orientationally ordered phase

1983 ◽  
Vol 50 (1-2) ◽  
pp. 151-182 ◽  
Author(s):  
A. B. Harris ◽  
S. Washburn ◽  
H. Meyer
Keyword(s):  
Single Crystals ◽  
Nmr Studies ◽  
Line Shapes

NMR studies on single crystals of H2: IV. The HD impurity spectrum

1981 ◽  
Vol 45 (1-2) ◽  
pp. 167-188 ◽  
Author(s):  
S. Washburn ◽  
R. Schweizer ◽  
H. Meyer
Keyword(s):  
Single Crystals ◽  
Nmr Studies ◽  
Impurity Spectrum

7Li and 14N NMR studies of phase II–III transition in LiNH4SO4 single crystals

2016 ◽  
Vol 247 ◽  
pp. 23-26
Author(s):  
Ae Ran Lim
Keyword(s):  
Single Crystals ◽  
Phase Ii ◽  
Nmr Studies ◽  
14N Nmr

A structural study of (1RS,2SR,3RS,4SR,5RS)-2,4-dibenzoyl-1,3,5-triphenylcyclohexan-1-ol chloroform hemisolvate and (1RS,2SR,3RS,4SR,5RS)-2,4-dibenzoyl-1-phenyl-3,5-bis(2-methoxyphenyl)cyclohexan-1-ol

2015 ◽  
Vol 71 (6) ◽  
pp. 491-498 ◽  
Author(s):  
Mikhail E. Minyaev ◽  
Dmitrii M. Roitershtein ◽  
Ilya E. Nifant'ev ◽  
Ivan V. Ananyev ◽  
Tatyana V. Minyaeva ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bond ◽  
Single Crystals ◽  
Structural Study ◽  
Chair Conformation ◽  
Cyclohexane Ring ◽  
Nmr Studies ◽  
Acta Cryst

(1RS,2SR,3RS,4SR,5RS)-2,4-Dibenzoyl-1,3,5-triphenylcyclohexan-1-ol or (4-hydroxy-2,4,6-triphenylcyclohexane-1,3-diyl)bis(phenylmethanone), C38H32O3, (1), is formed as a by-product in the NaOH-catalyzed synthesis of 1,3,5-triphenylpentane-1,5-dione from acetophenone and benzaldehyde. Single crystals of the chloroform hemisolvate, C38H32O3·0.5CHCl3, were grown from chloroform. The structure has triclinic (P-1) symmetry. One diastereomer [as a pair of (1RS,2SR,3RS,4SR,5RS)-enantiomers] of (1) has been found in the crystal structure and confirmed by NMR studies. The dichoromethane hemisolvate has been reported previously [Zhanget al.(2007).Acta Cryst.E63, o4652]. (1RS,2SR,3RS,4SR,5RS)-2,4-Dibenzoyl-3,5-bis(2-methoxyphenyl)-1-phenylcyclohexan-1-ol or [4-hydroxy-2,6-bis(2-methoxyphenyl)-4-phenylcyclohexane-1,3-diyl]bis(phenylmethanone), C40H36O5, (2), is also formed as a by-product, under the same conditions, from acetophenone and 2-methoxybenzaldehyde. Crystals of (2) have been grown from chloroform. The structure has orthorhombic (Pca21) symmetry. A diastereomer of (2) possesses the same configuration as (1). In both structures, the cyclohexane ring adopts a chair conformation with all bulky groups (benzoyl, phenyl and 2-methoxyphenyl) in equatorial positions. The molecules of (1) and (2) both display one intramolecular O—H...O hydrogen bond.

Effect of Lattice Disorder on the Line Shape of NMR Spin Echo Signals

1969 ◽  
Vol 24 (3) ◽  
pp. 332-336 ◽  
Author(s):  
M Mehring ◽  
O Kanert
Keyword(s):  
Shear Stress ◽  
Dislocation Density ◽  
Single Crystals ◽  
Point Defects ◽  
Line Shape ◽  
Spin Echo ◽  
Square Root ◽  
Lattice Disorder ◽  
Line Shapes ◽  
The Mean

Abstract The spin echo line shapes of Rb87 and Br79.81 have been measured in undeformed and plasti­cally deformed RbBr single crystals. Analysis of the line shape of the measured echoes shows that the quadrupolar part of the echoes is given by point defects in the case of undeformed crystals, whereas in deformed crystals this term is determined by dislocations. A quantitative evaluation of the width of the quadrupolar shape yields the mean dislocation density in the samples as a function of the shear stress acting during the deformation. It was found that the square root of the dislocation density is proportional to the shear stress.

Determination of 31P chemical shielding tensors from NMR studies on single crystals of chlorotris(triphenylphosphine) rhodium(I)

1985 ◽  
Vol 115 (1) ◽  
pp. 19-23 ◽  
Author(s):  
A. Naito ◽  
D.L. Sastry ◽  
C.A. McDowell
Keyword(s):  
Single Crystals ◽  
Chemical Shielding ◽  
Nmr Studies ◽  
Shielding Tensors

NMR studies of single crystals of H2: II. The spectrum of isolated ortho-H2 pairs

1979 ◽  
Vol 37 (3-4) ◽  
pp. 309-341 ◽  
Author(s):  
R. Schweizer ◽  
S. Washburn ◽  
H. Meyer ◽  
A. B. Harris
Keyword(s):  
Single Crystals ◽  
Nmr Studies

Symmetry, disorder, and dynamics in solid crown ether complexes: 2H NMR studies of 15-crown-5·NaI, 15-crown-5·NaClO4, and 21-crown-7·KI

1999 ◽  
Vol 77 (11) ◽  
pp. 1911-1921 ◽  
Author(s):  
G W Buchanan ◽  
M Gerzain ◽  
C I Ratcliffe
Keyword(s):  
Phase Transitions ◽  
High Temperature ◽  
Crown Ether ◽  
Detailed Analysis ◽  
Room Temperature ◽  
2H Nmr ◽  
Nmr Studies ◽  
H Nmr ◽  
Line Shapes ◽  
Crown Ether Complexes

2H NMR line shapes have been obtained as a function of temperature for partially deuteriated 15-crown-5·NaI, 15-crown-5·NaClO4 and 21-crown-7·KI. Sudden changes in the line shapes above 330 K correspond to phase transitions: DSC shows transitions at 338, 347 K for 15-crown-5·NaI, and 356, 374, 383 K for 15-crown-5·NaClO4. The 2H NMR line shapes for the room temperature (RT) phases show the onset of a motion of the macrocycles above 200K, which is rapid a little above room temperature. Through detailed analysis of the complicated line shapes it has been shown that the most consistent interpretation of the dynamics in these RT phases is a "merry-go-round" type of motion similar to that found for 18-crown-6 and 12-crown-4 complexes in which O-CH2-CH2 units exchange sites around the ring, simultaneously adjusting their conformation to fit the site. In the high-temperature phases of all three complexes all the ring atoms are dynamically equivalent. This can only happen through a combination of increased symmetry and disorder for which possible models have been devised.Key words: 2H NMR, crown ether complexes, dynamics, disorder.

NMR studies of single crystals of the topological insulator Bi2Te3 at low temperatures

2017 ◽  
Vol 59 (5) ◽  
pp. 855-859 ◽  
Author(s):  
A. O. Antonenko ◽  
E. V. Charnaya ◽  
D. Yu. Nefedov ◽  
D. Yu. Podorozhkin ◽  
A. V. Uskov ◽  
...  
Keyword(s):  
Single Crystals ◽  
Topological Insulator ◽  
Low Temperatures ◽  
Nmr Studies

NMR studies of diffusion anisotropy in metal hydride single crystals

1991 ◽  
Vol 172-174 ◽  
pp. 603-610 ◽  
Author(s):  
H.C. Hoke ◽  
H.E. Schone ◽  
C.A. Sholl ◽  
S.P. Usher ◽  
R.G. Barnes ◽  
...  
Keyword(s):  
Single Crystals ◽  
Metal Hydride ◽  
Diffusion Anisotropy ◽  
Nmr Studies
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