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Formaldehyde spectrum from: http:/Avww.cem.msu.edu/~reusch/ Virtual Text/Spectrpy/InfraRed/infrared.htm#ir2
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eon) 3.10 R(Ns+-N) [A]
Figure 11.5. Correlations between N—H 1, and N—{H)--N distances (from Novak, 1974).
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Common IR Sol
Wavenumber, cm™!
5000 2500 1667 1250 1000 833 714 625
Carbon disulfide
Carbon tetrachloride
Tetrachloroethylene — base
Chloroform
Dimethylformamide-}- /-— —_—-
Dioxane - — +— —-
Cyclohexane - — - -
Benzene
8
Wavelength, um
12 14
The horizontal lines indicate regions where solvent transmits at least
25% of the incident radiation in a 1 mm cell.
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“fingerprint” region
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- . - Figure 5. The terahertz absorption spectra of two polymorphs of
Figure 1. Schematic diagram of the principal components within a terahertz spec- sulfathiazole. The red spectrum is due to polymorph Il while the blue is
trometer. due to polymorph V. There are considerable spectral diferences
between these spectra,
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SECOND OVERTONE RI N INATION BANDS
REET ieee
NH _OH OH | NH CH+CH = CH=+CC
OH cH NH cH cH c=0 OH NH + OH
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2.2167 +
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1.7202+
1.47207
1.2237 4
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0.7273;
0.4790 -
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Wavelength (nm)
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0.6983 +
0.6127 +
0.5271 +
0.4415 +
0.3559 +
0.2704 +
0.1848 +
0.0992 +
0.0136
0.0720;
0S a
1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500
Wavelength (nm)
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IR Microscoy
e Most FTIR microscopes image usin
e IR spectra from a region are acquir
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in contrast with scanning techniques.
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wavelengths.
CD camera (optical)
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IR Microscopy: Imag
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color-coding peaks based on thei
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every point in the image vs. two - k
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Absorbance (CN)
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02 03
Absorbance (C=CH)
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