{"title":"Update of a Classic: A Compact Fiber-Optic-Based Laser Luminescence Instrument To Measure Bimolecular Quenching Rate Constants","authors":"Mary Sever, and , Mark A. Young*, ","doi":"10.1021/acs.jchemed.4c0120010.1021/acs.jchemed.4c01200","DOIUrl":null,"url":null,"abstract":"<p >We have constructed a compact laser-based spectrometer that confines the laser light to a fiber-optic and is suitable for use in an open undergraduate physical chemistry laboratory. The instrument employs currently available technology and is relatively inexpensive compared to research-grade instruments. Nanosecond time resolution is achieved, and we have successfully utilized the spectrometer for a classic laser experiment to measure the bimolecular quenching rate constant for the photoexcited tris(2,2′-bipyridyl)ruthenium(II) complex by Fe(III) in aqueous solution using Stern–Volmer analysis. The results are very reproducible with small experimental error and compare well with published values for quenching rate constants of the Ru(II) complex. The experiment exposes students to time-resolved laser measurements that rely on a photochemical kinetic analysis commonly taught as part of the physical chemistry curriculum.</p>","PeriodicalId":43,"journal":{"name":"Journal of Chemical Education","volume":"102 3","pages":"1230–1236 1230–1236"},"PeriodicalIF":2.5000,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acs.jchemed.4c01200","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Chemical Education","FirstCategoryId":"92","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acs.jchemed.4c01200","RegionNum":3,"RegionCategory":"教育学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
We have constructed a compact laser-based spectrometer that confines the laser light to a fiber-optic and is suitable for use in an open undergraduate physical chemistry laboratory. The instrument employs currently available technology and is relatively inexpensive compared to research-grade instruments. Nanosecond time resolution is achieved, and we have successfully utilized the spectrometer for a classic laser experiment to measure the bimolecular quenching rate constant for the photoexcited tris(2,2′-bipyridyl)ruthenium(II) complex by Fe(III) in aqueous solution using Stern–Volmer analysis. The results are very reproducible with small experimental error and compare well with published values for quenching rate constants of the Ru(II) complex. The experiment exposes students to time-resolved laser measurements that rely on a photochemical kinetic analysis commonly taught as part of the physical chemistry curriculum.
期刊介绍：
The Journal of Chemical Education is the official journal of the Division of Chemical Education of the American Chemical Society, co-published with the American Chemical Society Publications Division. Launched in 1924, the Journal of Chemical Education is the world’s premier chemical education journal. The Journal publishes peer-reviewed articles and related information as a resource to those in the field of chemical education and to those institutions that serve them. JCE typically addresses chemical content, activities, laboratory experiments, instructional methods, and pedagogies. The Journal serves as a means of communication among people across the world who are interested in the teaching and learning of chemistry. This includes instructors of chemistry from middle school through graduate school, professional staff who support these teaching activities, as well as some scientists in commerce, industry, and government.
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