Cyclohexanone: Infrared Spectrum

Topics: Infrared, Infrared spectroscopy, Spectroscopy Pages: 4 (954 words) Published: October 8, 1999

The oxidation of cyclohexanol to cyclohexanone involves the
removal of hydrogen from the OH group. After separation and
purification, an Infrared Spectrum will be run to determine the
composition of the recovered material.

Infrared Spectroscopy is a very powerful technique used in the
determination of molecular structure and the identification of
unknown organic materials. The infrared spectrum yields direct
information about the presence or absence of key functional groups.
"The region of the infrared spectrum which is of greatest interest to
organic chemists is the wavelength range 2.5 to 15 micrometers
which correspond to approximately 4000 to 600cm-1"(Young). "When
atoms or molecules absorb light, the incoming energy excites a
quantized structure to a higher energy level. The type of excitation
depends on the wavelength of the light. Electrons are promoted to
higher orbirtals by ultraviolet or visible light, vibrations are excited by infrared light, and rotations are excited by microwaves" (Tissue).
IR spectroscopy is the measurement of the wavelength and

intensity of the absorption of infrared light by a sample. The
wavelength of IR absorption bands are characteristic of specific types
of chemical bonds.

An IR spectrophotometer is an instrument which is designed to
obtain an infrared spectra of a molecule. An IR spectra is obtained by
first irradiating a sample with an IR source of light. The light passes
through the sample, which can be in solution or contained within a
salt plate, and then onto an IR light detector. The spectrum is
analyzed by examining at which frequency the peaks occur. Different
peak frequencies indicate different types of vibrational motion and
hence, different types of chemical bonds. The peak intensities are
usually noted as...

Cited: McMurry, John. Organic Chemistry. Brooks/Cole Publishing Company.

4th ed. California, 1995.

Young, Paul R. Organic Chemistry Online. University of Illinois at

Chicago. Copyright 1996.

Tissue, Brian M. SCIMEDIA. WWW. SCIMEDIA.COM. Copyright 1996.
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