928202-07-7Relevant academic research and scientific papers
The photochromism of 1-Alkyl-2-(arylazo)imidazoles trapped in water pool by AOT-heptane reverse micelle
Gayen, Pailab,Sinha, Chittaranjan
, p. 751 - 762 (2013/08/23)
1-Alkyl-2-(arylazo)imidazole exists in trans-?eomctry about-N=N-group at ambient condition. UV light irradiation in (363-371 nm) in solution phase of the compounds has changed their/rans-gcometry to c/s-structure. The cis-to-trans isomérisation proceeds slowly in visible light irradiation while it is appreciably fast on heating. The photoisomerisation rate is controlled by microenvironment of photochrome. In this work we have examined the influence of reverse micelle (AOT/n-heptane/ water) on kinetics and mechanism of photoisomerisation of azoimidazoles. The effcct of [AOT] and water pool size [W] on the quantum yields of trans-to-cis isomérisation are examined. The rate of trans-to-cis transformation is increased by 5-66% with increase in [AOT]. The quantum yield is also increased by 30-120% under identical condition. The activation energy (Ea) of cis-to-trans is calculated and (n presence of reverse micelle the activation energy is reduced. It justifies the enhancement of rate.
Effect of PEG-200 and Tween-20 on photoisomerization of 1-alkyl-2-(arylazo)imidazoles in toluene
Gayen, Pallab,Sinha, Chittaranjan
, p. 116 - 121,6 (2012/12/11)
The photoisomerization of 1-alkyl-2-(arylazo)imidazole, trans-to-cis, has been studied in the matrix of PEG-200 and Tween-20 in toluene medium by UV light irradiation. The trans and cis-isomers have different absorption spectra. The cis-to-trans isomeriza
