scholarly journals Phenyl rotation barrier in Z -azobenzene: A physical organic problem in honor of J.D.R.

2018 ◽  
Vol 31 (8) ◽  
pp. e3847
Author(s):  
William J. Brittain ◽  
Shiva K. Rastogi ◽  
Robert A. Rogers ◽  
Peter Rinaldi
Keyword(s):  
Rotation Barrier ◽  
Physical Organic

General Theory for Multiple Input-Output Perturbations in Complex Molecular Systems. 1. Linear QSPR Electronegativity Models in Physical, Organic, and Medicinal Chemistry

2013 ◽  
Vol 13 (14) ◽  
pp. 1713-1741 ◽  
Author(s):  
Humberto Gonzalez-Diaz ◽  
Sonia Arrasate ◽  
Asier Gomez-SanJuan ◽  
Nuria Sotomayor ◽  
Esther Lete ◽  
...  
Keyword(s):  
General Theory ◽  
Medicinal Chemistry ◽  
Input Output ◽  
Molecular Systems ◽  
Physical Organic ◽  
Multiple Input

Rotationsbarriere der Endgruppen bei Poly- methinoxonolen verschiedener Kettenlänge / Rotation Barrier of the End Groups of Polymethine Oxonols with Different Chain Lengths

1976 ◽  
Vol 31 (8) ◽  
pp. 1017-1018 ◽  
Author(s):  
H. Oehling ◽  
F. Baer
Keyword(s):  
Nmr Spectra ◽  
Rotation Barrier ◽  
Free Enthalpy ◽  
Temperature Dependent ◽  
Restricted Rotation ◽  
H Nmr ◽  
Enthalpy Of Activation ◽  
End Groups ◽  
Electron Contribution ◽  
Chain Lengths

Abstract Polymethine oxonols show temperature dependent 1H-NMR-spectra because of restricted rotation of the end groups. The dependence of the value of the corresponding free enthalpy of activation AGt on the length of the poly-methine chain can be explained by the change of the π-electron contribution to ⊿G≠.

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