The effect of hydrogen bonding propensity and enantiomeric composition on the dynamics of supercooled ketoprofen – dielectric, rheological and NMR studies

2016 ◽  
Vol 18 (15) ◽  
pp. 10585-10593 ◽  
Author(s):  
K. Adrjanowicz ◽  
K. Kaminski ◽  
M. Tarnacka ◽  
K. Szutkowski ◽  
L. Popenda ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Dynamic Properties ◽  
Enantiomeric Composition ◽  
Nmr Studies ◽  
Glass Forming

We have investigated the effect of changes in the hydrogen bonding propensity and enantiomeric composition on the dynamic properties of glass-forming liquid ketoprofen.

17O-nmr studies of the conformational and dynamic properties of enkephalins in aqueous and organic solutions using selectively labeled analogues

Biopolymers ◽  
1989 ◽  
Vol 28 (1) ◽  
pp. 15-26 ◽  
Author(s):  
Constantinos Sakarellos ◽  
Ioannis P. Gerothanassis ◽  
Nicolaos Birlirakis ◽  
Theodoros Karayannis ◽  
Maria Sakarellos-Daitsiotis ◽  
...  
Keyword(s):  
Dynamic Properties ◽  
Nmr Studies ◽  
17O Nmr ◽  
Organic Solutions

Molecular and crystal structure of azadirachtin-H

1996 ◽  
Vol 52 (1) ◽  
pp. 145-150 ◽  
Author(s):  
T. R. Govindachari ◽  
Geetha Gopalakrishnan ◽  
S. S. Rajan ◽  
V. Kabaleeswaran ◽  
L. Lessinger
Keyword(s):  
Molecular Structure ◽  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Intramolecular Hydrogen Bonding ◽  
Hydroxyl Group ◽  
Inhibiting Activity ◽  
Nmr Studies ◽  
Rotation Axes ◽  
Intramolecular Hydrogen ◽  
Azadirachtin A

Azadirachtin-H, isolated from the seed kernels of Azadirachta indica (neem), crystallizes in space group I4, Z = 8, with disordered ethyl acetate solvent filling channels along the fourfold rotation axes. The crystal structure determination showed that the previously reported molecular structure deduced from NMR studies was correct except for the stereochemistry at C(11). Azadirachtin-H, which belongs to a group of C-seco-tetranortriterpenoids (C-seco-limonoids) of great interest for their insect antifeedant and ecdysis-inhibiting activity, has some unusual features: the absence of a carbomethoxy group at C(11); the presence of a cyclic hemiacetal function at C(11); the α-orientation of the hydroxyl group on C(11), opposite to that in all other known azadirachtins with a hydroxyl group on C(11), except azadirachtin-I. There is no intramolecular hydrogen bonding. In this crystal the rotation of the two major moieties of the azadirachtin-H molecule about the single connecting C(8)—C(14) bond is quite different from that in azadirachtin-A, whose crystal structure has recently been determined.

1H Fast MAS NMR Studies of Hydrogen-Bonding Interactions in Self-Assembled Monolayers

2003 ◽  
Vol 125 (14) ◽  
pp. 4174-4184 ◽  
Author(s):  
Shane Pawsey ◽  
Mark McCormick ◽  
Susan De Paul ◽  
Robert Graf ◽  
Y. S. Lee ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Mas Nmr ◽  
Self Assembled Monolayers ◽  
Nmr Studies ◽  
Hydrogen Bonding Interactions ◽  
Fast Mas ◽  
Assembled Monolayers ◽  
Self Assembled

Isochronal superposition and density scaling of the intermolecular dynamics in glass-forming liquids with varying hydrogen bonding propensity

RSC Advances ◽  
2016 ◽  
Vol 6 (55) ◽  
pp. 49370-49375 ◽  
Author(s):  
K. Adrjanowicz ◽  
J. Pionteck ◽  
M. Paluch
Keyword(s):  
Hydrogen Bonding ◽  
Hydrogen Bonds ◽  
Glass Forming

We have tested the idea of thermodynamic scaling T−1ργ and isochronal superposition in glass-forming liquids with varying propensity to form hydrogen bonds.

Sign in / Sign up

Export Citation Format

Share Document