Results 221 to 230 of about 20,971 (273)
Some of the next articles are maybe not open access.
Mechano-isomerization of azobenzene
Chemical Communications, 2013We show that ultrasound-induced mechanical force isomerizes an azobenzene centered within a poly(methyl acrylate) polymer from cis to trans configuration without cleaving the azo bond. The isomerization rate was not altered by the polarity of the solvent indicating that the isomerization occurs through a non-polar, inversion transition state.
Sravan K, Surampudi +3 more
openaire +2 more sources
Enthalpies of formation of cis-azobenzene and trans-azobenzene
The Journal of Chemical Thermodynamics, 1992The standard (p° = 0.1 MPa) molar enthalpy of formation of crystalline trans-azobenzene was determined from its enthalpy of combustion in oxygen at 298.15 K measured by static-bomb calorimetry. The enthalpy of isomerization: ΔisomH°m(cr, cis → trans)/(kJ · mol−1) = -(49.1 ± 1.0), was measured by reaction-solution calorimetry: the isomerization was ...
A.R. Dias +7 more
openaire +1 more source
Azobenzene photoswitches for biomolecules
Chemical Society Reviews, 2011The photoisomerization of azobenzene has been known for almost 75 years but only recently has this process been widely applied to biological systems. The central challenge of how to productively couple the isomerization process to a large functional change in a biomolecule has been met in a number of instances and it appears that effective photocontrol
Andrew A, Beharry, G Andrew, Woolley
openaire +2 more sources
The Journal of Physical Chemistry A, 2006
A series of azobenzenes was studied using ab initio methods to determine the substituent effects on the isomerization pathways. Energy barriers were determined from three-dimensional potential energy surfaces of the ground and electronically excited states. In the ground state (S(0)), the inversion pathway was found to be preferred.
Christina R, Crecca, Adrian E, Roitberg
openaire +2 more sources
A series of azobenzenes was studied using ab initio methods to determine the substituent effects on the isomerization pathways. Energy barriers were determined from three-dimensional potential energy surfaces of the ground and electronically excited states. In the ground state (S(0)), the inversion pathway was found to be preferred.
Christina R, Crecca, Adrian E, Roitberg
openaire +2 more sources
Theoretical study on the pyrolysis of azobenzene and complex of azobenzene/NO2
Journal of Molecular Structure: THEOCHEM, 2008Abstract The (U)MP2/6-311+G ∗ //(U)HF/6-31G ∗ strategy was used to study the thermal decomposition mechanism of azobenzene and its complex with two NO 2 radicals. The calculated results showed that the initial thermal decomposition of azobenzene mainly involved the homolytic fission of the C N bond.
Luoxin Wang, Xinlin Tuo, Xiaogong Wang
openaire +1 more source
Photodecomposition of azobenzenes
Journal of Chemical Technology and Biotechnology, 1980AbstractUpon ultraviolet irradiation azobenzene and decafluoroazobenzene in cyclohexane and diethyl ether solutions decompose into phenylazo, phenylazomethylene and aniline radicals. The major products formed in cyclohexane solution are N‐cyclohexylaniline, N‐cyclohexylpentafluoroaniline, phenylazocyclohexane, pentafluorophenyl‐azocyclohexane, 1‐phenyl‐
Ahlam M. J. Ali, Zeki Y. Al‐Saigh
openaire +1 more source
Russian Chemical Bulletin, 1993
Thermolysis of azobenzene in a melt and in solution results in the formation of aniline. The possible directions of the reaction are considered. Comparison of the enthalpies of the reaction proves that the cleavage of a π-bond in the N=N group to form a biradical intermediate is thermodynamically more favorable than that of a C-N π-bond.
M. F. Budyka, M. M. Kantor
openaire +1 more source
Thermolysis of azobenzene in a melt and in solution results in the formation of aniline. The possible directions of the reaction are considered. Comparison of the enthalpies of the reaction proves that the cleavage of a π-bond in the N=N group to form a biradical intermediate is thermodynamically more favorable than that of a C-N π-bond.
M. F. Budyka, M. M. Kantor
openaire +1 more source
SPIE Proceedings, 2015
Azobenzene derivatives constitute a group of dyes which have photochromic properties and have been investigated as promising systems for diverse applications in the unconventional optic area, their properties can be moulded with help of light.
Ionica Ionita +5 more
openaire +1 more source
Azobenzene derivatives constitute a group of dyes which have photochromic properties and have been investigated as promising systems for diverse applications in the unconventional optic area, their properties can be moulded with help of light.
Ionica Ionita +5 more
openaire +1 more source
Cyclic Azobenzene‐BODIPY Hybrids
Chemistry – A European Journal, 2023AbstractCyclic azobenzene‐BODIPY hybrids were synthesized via cyclization by 1) acid‐catalysed condensation of azobenzene‐bridged dipyrroles with 3,5‐di‐tert‐butylbenzaldehyde, 2) oxidation with DDQ, and 3) metalation with BF3 ⋅ Et2O. The structures of many cyclic hybrids have been confirmed by single crystal X‐ray analysis.
Bin Wen +10 more
openaire +2 more sources