The effects of a para substituent, as the electron-donating −OCH3 and −OtBu groups and the electron-withdrawing −Br and −F atoms, on azobenzeneisomerization have been investigated in a series of imidazolium ionic liquids (BMIM PF6, BMIM BF4, BMIM Tf2N, EMIM Tf2N, BM2IM Tf2N, and HMIM Tf2N). The thermal cis–trans conversion tends to be improved in the presence of the substituent, as pointed out by
Gold nanoparticle catalysis of the cis–trans isomerization of azobenzene
作者:Geniece L. Hallett-Tapley、Claudio D'Alfonso、Natalia L. Pacioni、Christopher D. McTiernan、María González-Béjar、Osvaldo Lanzalunga、Emilio I. Alarcon、Juan C. Scaiano
DOI:10.1039/c3cc41669k
日期:——
Ablated, "pseudo-naked" gold nanoparticles (AuNPs) catalyze the cis-transisomerization of substituted azobenzenes. para-Substitution was found to affect the rate of isomerization, suggesting the participation of AuNP-mediated electron transfer in the isomerizationmechanism.
Concentration Dependent Photodimerization of Azobenzenes in Solution
作者:Masanobu Kojima、Tomoko Takagi、Takashi Karatsu
DOI:10.1246/cl.2000.686
日期:2000.6
Cis-trans photoisomerization of azobenzenes in higher concentrations proceeds through a bimolecular reaction process, probably involving the dimer biradical intermediates, in competition with a unimolecular isomerization process, which is the predominant reaction in lower concentrations.
as reaction media. Despite the presence of the same imidazolium ring in their structure they are different in many chemical and physical properties due to the nature of the anions. The thermal cis-trans isomerization of an electronically activated azobenzene have been used as reaction model to compare the behavior of PF₆- and Tf₂N-. Rotation is the mechanism by which the investigated azobenzene is converted