Effects of unidirectional and mutual interactions between microstructures and azo dyes as “kinetic” probe molecules on cis→trans isomerization rate constants in aqueous P85 and F88 triblock copolymer solutions

2007 ◽  
Vol 40 (2) ◽  
pp. 59-65 ◽  
Author(s):  
Helmut Knoll
Keyword(s):  
Azo Dyes ◽  
Rate Constants ◽  
Triblock Copolymer ◽  
Probe Molecules ◽  
Isomerization Rate ◽  
Trans Isomerization

Die Lösungsmittelabhängigkeit der thermischen cis-trans-Isomerisierung von N-Benzylidenanilinen mit Donator/Akzeptor-Substituenten.

1976 ◽  
Vol 31 (7) ◽  
pp. 953-959 ◽  
Author(s):  
U. Berns ◽  
G. Heinrich ◽  
H. Gusten
Keyword(s):  
Ground State ◽  
Rate Constants ◽  
Flash Photolysis ◽  
Solvent Polarity ◽  
Linear Functions ◽  
Aryl Group ◽  
Trans Isomerization ◽  
Solvatochromic Shifts ◽  
Z Value ◽  
Inversion Mechanism

Thermal cis →-trans isomerization of eight N-benzylideneanilines with donor and/or acceptor substituents in the para, para'-positions was studied in different solvents by observing the rapid relaxation to the thermodynamic stable trans isomer following flash photolysis. With the push-pull effect of the substituents in the direction of the N-aryl group the rate constant at 25°C is by three powers of 10 faster compared to the N–benzylideneaniline with opposite arrangement of substituents. The rate constants are independent of the nature of the substituents in the para-position of the benzylidene group. The rate constants of N-(4-nitrobenzylidene)-p-anisidine are linear functions of the solvent polarity scale based on solvatochromic shifts (Kosowers Z-value or Dimroths ET-value). With increasing push-pull effect of the substituents in the direction of the N-aryl group the rate constants do no longer depend on the polarity of the solvent. The observed solvent effects on the rates and the activation energies for thermal cis→ trans isomerization suggest that the transition state of the reaction is less polar than the ground state of the sterically hindered cis-N-benzylideneaniline, thus favouring an inversion mechanism to become operative with respect to the N-benzylideneanilines.

Peptidyl-prolyl cis-trans isomerase does not affect the Pro-43 cis-trans isomerization rate in folded calbindin D9k

FEBS Letters ◽  
1990 ◽  
Vol 263 (1) ◽  
pp. 27-30 ◽  
Author(s):  
Johan Kördel ◽  
Torbjörn Drakenberg ◽  
Sture Forsén ◽  
Eva Thulin
Keyword(s):  
Isomerization Rate ◽  
Calbindin D9k ◽  
Trans Isomerization

Thermal cis-trans isomerization of azo dyes in poly(methyl methacrylate) matrix: A kinetic study

1993 ◽  
Vol 49 (12) ◽  
pp. 2235-2239 ◽  
Author(s):  
Pier Luigi Beltrame ◽  
Ernestina Dubini Paglia ◽  
Antonella Castelli ◽  
Gian Franco Tantardini ◽  
Alberto Seves ◽  
...  
Keyword(s):  
Methyl Methacrylate ◽  
Kinetic Study ◽  
Azo Dyes ◽  
Poly Methyl Methacrylate ◽  
Trans Isomerization

Effect of polypropylene morphology on thermal cis-trans isomerization and photofading of some azo dyes: A kinetic study

1989 ◽  
Vol 38 (4) ◽  
pp. 755-763 ◽  
Author(s):  
Pier Luigi Beltrame ◽  
Ernestina Dubini Paglia ◽  
Bruno Marcandalli ◽  
Alberto Seves
Keyword(s):  
Kinetic Study ◽  
Azo Dyes ◽  
Trans Isomerization

scholarly journals cis/trans Isomerization rate of oxazolam in organic solvents measured by high-performance liquid chromatography.

1989 ◽  
Vol 37 (4) ◽  
pp. 1044-1046 ◽  
Author(s):  
Yukihisa KURONO ◽  
Yasuhiro JINNO ◽  
Tomonari KUWAYAMA ◽  
Naomi SATO ◽  
Tamotsu YASHIRO ◽  
...  
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Organic Solvents ◽  
High Performance ◽  
Isomerization Rate ◽  
Trans Isomerization

Effect of poly(ethylene terephthalate) morphology on thermal cis-trans isomerization and photofading of some azo dyes: A kinetic study

1987 ◽  
Vol 33 (8) ◽  
pp. 2965-2974 ◽  
Author(s):  
Pier Luigi Beltrame ◽  
Ernestina Dubini-Paglia ◽  
Bruno Marcandalli ◽  
Patrizia Sadocco ◽  
Alberto Seves
Keyword(s):  
Kinetic Study ◽  
Azo Dyes ◽  
Ethylene Terephthalate ◽  
Trans Isomerization ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene
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