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Birge–Sponer Estimation of the C–H Bond Dissociation Energy in Chloroform Using Infrared, Near-Infrared, and Visible Absorption Spectroscopy. An Experiment in Physical Chemistry

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M. L. Myrick , A. E. Greer , A. A. Nieuwland , R. J. Priore , J. Scaffidi , Danielle Andreatta and Paula Colavita

Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC 29208

J. Chem. Educ., 2008, 85 (9), p 1276

DOI: 10.1021/ed085p1276

Publication Date (Web): September 1, 2008

Section:

History, Education, and Documentation

Abstract

The fundamental and overtone vibrational absorption spectroscopy of the C–H unit in CHCl₃ is measured for transitions from the ν = 0 energy level to ν = 1 through ν = 5 energy levels. The energies of the transitions exhibit a linearly-decreasing spacing between adjacent vibrational levels as the vibrational quantum number increases. These data are used as the basis for Birge–Sponer estimation of the dissociation energy, D₀, for the C–H bond in chloroform. The value obtained from the first 5 transitions is D₀ = 459 ± 8 kJ mol^-1 (95% confident interval), compared to a literature value of the bond dissociation energy for this bond of 401 kJ mol^-1. The error of 14.5% results from sampling only the most harmonic energy levels in the vibrational potential well.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Laboratory Instruction

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Covalent Bonding

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