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Influence of Dielectric Constant on the Spectral Behavior of Pinacyanol. A Spectrophotometric Experiment for Physical Chemistry

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Raimon Sabaté , Llúcia Freire and Joan Estelrich

Departament de Fisicoquímica, Universitat de Barcelona, Avda. Joan XXIII, s/n , E-08028 Barcelona, Spain

J. Chem. Educ., 2001, 78 (2), p 243

DOI: 10.1021/ed078p243

Publication Date (Web): February 1, 2001

Section:

History, Education, and Documentation

Abstract

The spectral behavior of pinacyanol was studied in methanol-water mixtures to observe the influence of the polarity of the solvent on wavelengths of maximal absorption and on the corresponding absorbance. The aqueous spectrum of pinacyanol shows two main peaks, which shift slightly toward longer wavelengths when the polarity of the solvent drops. In addition, a marked increase in the absorbance of one of the peaks concomitant to the reduction of solvent polarity is observed.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Laboratory Instruction

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Dyes / Pigments

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This article has been cited by 1 ACS Journal articles (1 most recent appear below).

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