Effects of Ligand Substitutions on the Rotation Rate of Indenyl Ligands in Bis(2-arylindenyl)zirconocenes by NMR Line-Shape Analysis and Relaxation in the Rotating Frame

2004 ◽  
Vol 23 (10) ◽  
pp. 2405-2411 ◽  
Author(s):  
Gregg M. Wilmes ◽  
Marcia B. France ◽  
Stephen R. Lynch ◽  
Robert M. Waymouth
Keyword(s):  
Shape Analysis ◽  
Line Shape ◽  
Rotation Rate ◽  
Rotating Frame ◽  
Line Shape Analysis

A study of internal rotation in 2-furaldehyde through 13C relaxation times in the rotating frame

1987 ◽  
Vol 52 (2) ◽  
pp. 541-546 ◽  
Author(s):  
Vladimír Mlynárik
Keyword(s):  
Shape Analysis ◽  
Line Shape ◽  
Activation Enthalpy ◽  
Relaxation Times ◽  
Rotating Frame ◽  
Line Shape Analysis ◽  
13C Relaxation Times ◽  
Free Activation Energy ◽  
13C Relaxation ◽  
Good Agreement

Carbon-13 relaxation times in the rotating frame were used to study the exchange between unequally populated rotamers of 2-furaldehyde. Calculated free activation energy and activation enthalpy are in good agreement with the results of 1H line shape analysis. Accuracy and reliability of this method in comparison with the line shape analysis is discussed.

Determination of the Accurate Values of the Rate Constant and Thermodynamic Parameters for the Rotation About the C(sp2)-C(aryl) Bond; Adamantan-1-yl 3-Bromo-2,4,6-trimethylphenyl Ketone

1998 ◽  
Vol 63 (7) ◽  
pp. 955-966
Author(s):  
Eva Přibylová ◽  
Miroslav Holík
Keyword(s):  
Thermodynamic Parameters ◽  
Shape Analysis ◽  
Rate Constants ◽  
Line Shape ◽  
Microsoft Excel ◽  
Hindered Rotation ◽  
H Nmr ◽  
Line Shape Analysis ◽  
Coalescence Temperature

Four programs for the 1H NMR line shape analysis: two commercial - Winkubo (Bruker) and DNMR5 (QCPE 165) and two written in our laboratory - Newton (in Microsoft Excel) and Simtex (in Matlab) have been tested in order to get highly accurate rate constants of the hindered rotation about a single bond. For this purpose four testing criteria were used, two of them were also developed by us. As supplementary determinations the rate constants obtained for the coalescence temperature and for the thermal racemization of chromatographically separated enantiomers were used which fitted well the temperature dependence of the rate constants determined by the line shape analysis. As a test compound adamantan-1-yl 3-bromo-2,4,6-trimethylphenyl ketone was prepared and studied. It was shown that supermodified simplex method used in our algorithm (Simtex), though time consuming, gives the most accurate values of the rate constants and consequently the calculated thermodynamic parameters Ea, ∆H≠, and ∆S≠ lay in relatively narrow confidence intervals.

Cope rearrangement of 9-methylenebarbaralane. Complete line shape analysis

1973 ◽  
Vol 38 (6) ◽  
pp. 1210-1215 ◽  
Author(s):  
Linda G. Greifenstein ◽  
Joseph B. Lambert ◽  
Michael J. Broadhurst ◽  
Leo A. Paquette
Keyword(s):  
Shape Analysis ◽  
Line Shape ◽  
Cope Rearrangement ◽  
Line Shape Analysis

First line shape analysis and spectroscopic parameters for the ν11 band of 12C2H4

2016 ◽  
Vol 184 ◽  
pp. 297-307 ◽  
Author(s):  
Et-touhami Es-sebbar ◽  
John Mantzaras ◽  
Yves Benilan ◽  
Aamir Farooq
Keyword(s):  
Shape Analysis ◽  
Line Shape ◽  
First Line ◽  
Spectroscopic Parameters ◽  
Line Shape Analysis

scholarly journals Determination of Effective Linewidth Using FMR Line Shape Analysis

1997 ◽  
Vol 07 (C1) ◽  
pp. C1-443-C1-444
Author(s):  
A. K. Srivastava ◽  
M. J. Patni ◽  
B. K. Chaturvedi
Keyword(s):  
Shape Analysis ◽  
Line Shape ◽  
Line Shape Analysis
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