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An Easy and Cheap Flash Spectroscopy Experiment

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Mauro Maestri , Roberto Ballardini , Fernando Jorge Silva Pina and Maria João Melo

Dipartimento di Chimica "G. Ciamician" dell''Università, 40126, Bologna, Italy

J. Chem. Educ., 1997, 74 (11), p 1314

DOI: 10.1021/ed074p1314

Publication Date (Web): November 1, 1997

Section:

History, Education, and Documentation

Abstract

In this work we applied a flash photolysis technique to the study of the kinetic behavior of a synthetic flavylium salt in aqueous solution. The kinetic processes triggered by the light pulse of a common camera flash, are followed by means of a sligthly modified, computer controlled, spectrophotometer. Light induces reversible absorbance changes and two different transient species are evidenced prior the full recovery of the system. The kinetic behavior and the spectra of the transient species are reported. The proposed experiment is cheap and easy and allows students of all levels to become familiar with the concepts of transient decay kinetics and time resolved spectra.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Laboratory Instruction

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Instrumental Methods

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Citing Articles

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This article has been cited by 5 ACS Journal articles (5 most recent appear below).

Photochemistry of 7-Hydroxy-2-(4-hydroxystyryl)-1-benzopyrylium and Related Compounds
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The Journal of Physical Chemistry B2009 113 (3), 719-727
- Photochemistry of 7-Hydroxy-2-(4-hydroxystyryl)-1-benzopyrylium and Related Compounds
  Ana M. Diniz, Raquel Gomes, A. Jorge Parola, César A. T. Laia and Fernando Pina
  The Journal of Physical Chemistry B2009 113 (3), 719-727
  2-Styryl-1-benzopyrylium derivatives exhibit deeper hues and absorption spectra that are substantially red-shifted when compared with their 2-phenyl-1-benzopyrylium analogues. They follow the same pH and light-dependent network of chemical reactions ...
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Photochromism of 7,4′-Dihydroxyflavylium in an AOT Reversed Micelle System
Vesselin Petrov, César A. T. Laia and Fernando Pina
Langmuir2009 25 (1), 594-601
- Photochromism of 7,4′-Dihydroxyflavylium in an AOT Reversed Micelle System
  Vesselin Petrov, César A. T. Laia and Fernando Pina
  Langmuir2009 25 (1), 594-601
  The investigation of a flavylium compound in AOT reverse micelles shows photochromic enhancement in a wide pH range, with features previously unobserved in other colloidal systems. In equilibrium, 7,4′-dihydroxyflavylium transforms into trans-chalcone ...
  Abstract | Full Text HTML | Hi-Res PDF | PDF w/ Links
Modern Developments in the Physical Chemistry Laboratory
Samuel A. Abrash
2007 973 (), 115-151
- Modern Developments in the Physical Chemistry Laboratory
  Samuel A. Abrash
  2007 973 (), 115-151
  Developments in the physical chemistry laboratory since the publication of the germinal text by Schwenz and Moore (1) are categorized and reviewed. The categories examined include modern instrumentation, current topics in chemistry, integrated ...
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Promoting Photochromism on Flavylium Derived 2-Hydroxychalcones in Aqueous Solutions by Addition of CTAB Micelles
Raquel Gomes, A. Jorge Parola, César A. T. Laia, and Fernando Pina
The Journal of Physical Chemistry B2007 111 (42), 12059-12065
- Promoting Photochromism on Flavylium Derived 2-Hydroxychalcones in Aqueous Solutions by Addition of CTAB Micelles
  Raquel Gomes, A. Jorge Parola, César A. T. Laia, and Fernando Pina
  The Journal of Physical Chemistry B2007 111 (42), 12059-12065
  A strategy to obtain photochromism from the network of chemical reactions originated by flavylium compounds in solution is described. This strategy is particularly useful for flavylium salts bearing amino groups which give rise to a variety of beautiful ...
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Multistate/Multifunctional Systems. A Thermodynamic, Kinetic, and Photochemical Investigation of the 4‘-Dimethylaminoflavylium Compound
Ana Roque, Carlos Lodeiro, Fernando Pina, Mauro Maestri, Stephane Dumas, Paolo Passaniti, and Vincenzo Balzani
Journal of the American Chemical Society2003 125 (4), 987-994
- Multistate/Multifunctional Systems. A Thermodynamic, Kinetic, and Photochemical Investigation of the 4‘-Dimethylaminoflavylium Compound
  Ana Roque, Carlos Lodeiro, Fernando Pina, Mauro Maestri, Stephane Dumas, Paolo Passaniti, and Vincenzo Balzani
  Journal of the American Chemical Society2003 125 (4), 987-994
  The 4-dimethylaminoflavylium ion in aqueous solution undergoes an intricate network of chemical reactions controlled by pH and light excitation. It is shown that nine different forms are involved, including two species that are not present in previously ...
  Abstract | Full Text HTML | Hi-Res PDF