Academic Journal
Isomerization Kinetics of Hydroxy-Substituted Azobenzenes Using a Modified Commercial Flash Photolysis Spectrometer
| Τίτλος: | Isomerization Kinetics of Hydroxy-Substituted Azobenzenes Using a Modified Commercial Flash Photolysis Spectrometer |
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| Γλώσσα: | English |
| Συγγραφείς: | Mary Sever, Mark A. Young (ORCID |
| Πηγή: | Journal of Chemical Education. 2023 100(7):2762-2769. |
| Διαθεσιμότητα: | Division of Chemical Education, Inc. and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail: eic@jce.acs.org; Web site: http://pubs.acs.org/jchemeduc |
| Peer Reviewed: | Y |
| Page Count: | 8 |
| Ημερομηνία έκδοσης: | 2023 |
| Τύπος εγγράφου: | Journal Articles Reports - Descriptive |
| Education Level: | Higher Education Postsecondary Education |
| Descriptors: | Laboratory Experiments, Scientific Concepts, Thermodynamics, Science Education, Chemistry, Hands on Science, Kinetics, Technology Uses in Education, College Science, Undergraduate Study, Photography, Light, Science Laboratories |
| DOI: | 10.1021/acs.jchemed.3c00200 |
| ISSN: | 0021-9584 1938-1328 |
| Περίληψη: | 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. |
| Abstractor: | As Provided |
| Entry Date: | 20240101 |
| Αριθμός Καταχώρησης: | EJ1445302 |
| Βάση Δεδομένων: | ERIC |
| ISSN: | 0021-9584 1938-1328 |
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| DOI: | 10.1021/acs.jchemed.3c00200 |