TY  - BOOK
AU  - Sever, Mary  
AU  - Young, Mark A. 
TI  - Isomerization Kinetics of Hydroxy-Substituted Azobenzenes Using a Modified Commercial Flash Photolysis Spectrometer (Journal Article)
SN  - 0021-9584
PY  - 2023///
CY  - Washington DC 
PB  - :American Chemical Society 
KW  - Azobenzene| Isomerization| Kinetic parameters| Mass spectrometers| physical chemistry| kinetics| photochemistry| nanotechnology
N1  - ***______{For Hard Copy, Please visit Library.}________***
N2  - Abstract: A laboratory experiment that exposes students to fundamental concepts in kinetics and statistical thermodynamics to study systems of great current interest in nanotechnology by employing a foundational technique in physical chemistry is described. A modified commercial flash photolysis spectrometer was used to study photoinduced isomerization reactions on the millisecond time scale for several hydroxy-substituted azobenzene compounds. The temperature-dependent transient decays were analyzed with an Eyring plot to yield the enthalpy and entropy of activation of the reverse isomerization process. The specific compounds studied were 4-phenylazophenol, 4-methyl-2-(phenylazo)phenol, and 2,4-dihydroxyazobenzene in ethanol solvent. Instrumental modifications include substitution of a UV-LED for the probe light source and use of a thin polyimide film heater adhered to the side of the sample cuvette to control temperature. Collection of experimental data and the subsequent plotting and analysis are easily accomplished by upper-division chemistry students and the results are consistently good, comparing well with literature values
UR  - https://doi.org/10.1021/acs.jchemed.3c00200
ER  -