FTIR Interpretation
INTERPRETATION
OF INFRARED (IR) SPECTRA
An IR spectrum by
itself does not provide an exact chemical structure of a compound, but
will provide information about its functionality based on band location
and intensity (see the table of functional groups).
Reference spectra are required for exact structural information.
The following information identifies the requirements and limitations
of FTIR analysis.
General Requirements
- Good quality
spectrum
- Proper sample
preparation
- Relatively
pure material
- Correlation
chart
- Reference
spectra for comparison
Limitations
- Closely related
materials, i.e.,
Polyethylene glycols - molecular weight
Vegetable oils
Petroleum based oils
Amino/Hydroxyl functionality - amino alcohols
- Mixtures
and some polymers
Urethanes
Phenolics
Silicates
- Inorganics
Difficult to identify cations
Simple anions (halogens)
Considerations
- Relative
intensities of bands are important
- Any mismatch
with reference spectrum negates identification
- Lack of bands
is positive information
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