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Section: 8 | Common Spurious Infrared Absorption Bands |
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John R. Rumble, ed., CRC Handbook of Chemistry and Physics, 103rd Edition (Internet Version 2022), CRC Press/Taylor & Francis, Boca Raton, FL.
If a specific table is cited, use the format: "Physical Constants of Organic Compounds," in CRC Handbook of Chemistry and Physics, 103rd Edition (Internet Version 2022), John R. Rumble, ed., CRC Press/Taylor & Francis, Boca Raton, FL.

COMMON SPURIOUS INFRARED ABSORPTION BANDS

Thomas J. Bruno and Paris D. N. Svoronos

The following table provides some of the common potential sources of spurious infrared absorptions that might appear on a spectrum (Refs. 1 and 2). Occasionally, the spectral lines of some impurities can be used as diagnostics; the reader is referred to the references for more details. Column definitions for the table are as follows.

Column heading Definition
Approximate wavenumber Approximate wavenumber of spurious infrared absorption, in cm-1
Wavelength Wavelength of spurious infrared absorption, in μm
Compound or group Molecular formula of compound or group that is the source of spurious absorption
Origin Possible origin of the compound or group

References

  1. Bruno, T. J., and Svoronos, P. D. N., CRC Handbook of Basic Tables for Chemical Analysis – Data-Driven Methods and Interpretation, Fourth Edition, CRC Press/Taylor & Francis, Boca Raton, FL, 2021. [https://doi.org/10.1201/b22281]
  2. Bruno, T. J., and Svoronos, P. D. N., CRC Handbook of Fundamental Spectroscopic Correlation Charts, CRC Press, Boca Raton, FL, 2006. [https://doi.org/10.1201/9781420037685]
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Common Spurious Infrared Absorption Bands



Approximate wavenumber in cm–1Wavelength in μmCompound or groupOrigin
Continued on next page...
37002.70H2OWater in solvent (thick layers)
36502.74H2OWater in some quartz windows
34502.9H2OHydrogen-bonded water, usually in KBr disks
29003.44–CH3, =CH2Paraffin oil, residual from previous mulls
23504.26CO2Atmospheric absorption, or dissolved gas from a dry ice bath
23304.30CO2
2300 and 21504.35 and 4.65CS2Leaky cells, previous analysis of samples dissolved in carbon disulfide
19965.01BO2-Metaborate in the halide window
1400–20005–7H2OAtmospheric absorption
18205.52COCl2Phosgene, decomposition product in purified CHCl3
17555.7Phthalic anhydrideDecomposition product of phthalate esters or resins; paint off-gas product
1700–17605.7–5.9=C=OBottle-cap liners leached by sample
17205.8PhthalatesPhthalate polymer plastic tubing
16406.1H2OWater of crystallization entrenched in sample
15206.6CO2Leaky cells, previous analysis
14307.0CO3-2Contaminant in halide window
13607.38NO3-Contaminant in halide window
12707.9=SiO–Silicone oil or grease
1000–11109–10≡Si–O–Si≡Glass; silicones


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