Near infrared spectroscopy of organic acids: comparing OH and CH oscillator frequencies and intensities |
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Authors: | D.K. Havey |
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Affiliation: | Department of Chemistry and Biochemistry and CIRES, Campus Box 215, University of Colorado, Boulder, CO 80309, USA |
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Abstract: | This work investigates the vibrational spectroscopy of a series of organic acids, CH3(CH2)nCOOH (n = 1-5), previously unobserved in the IR and near-IR (2000-15 000 cm−1). The work obtains frequencies and relative intensities for all OH and CH stretching transitions. Comparison of the frequencies and intensities of CH and OH stretching transitions reveal interesting trends in acid chain length that are discussed. Literature values for acetic acid (CH3COOH) and formic acid (HCOOH) are used to gain a broader understanding for the spectroscopy of the organic acids CH3(CH2)nCOOH. The observation of several combination bands involving the CH and OH stretching vibrations and possible rotational isomer and hot band transitions are reported. |
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Keywords: | Vibrational Overtone Propionic acid Butyric acid Valeric acid Hexanoic acid Heptanoic acid Combination band |
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