What absorbs at 1997 cm⁻¹ in an FTIR spectrum?
A band near 1997 cm⁻¹ can point to several functional groups. Below are the most likely assignments, ranked by how much published evidence supports each — every one traceable to literature (DOI) and cross-validated against our 130,000+ reference spectra and knowledge graph.
Backed by 5 cited sources
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Alkyl C-H | 2 | 2 | 1.0 |
| Hydroxyl (O-H) | 2 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Carbonate | 1 | 1 | 1.0 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
Hydroxyl (O-H) confidence 1.0
“Although cell elongation is deficiency significantly affects the position and intenceased by B deficiency, the rapid cell division does sity of carboxylic bands (Figure 3(b)), and the denot stop and cell wall synthesis continues, ultimately”
Changes in chemical composition and structure of root cell wall of citrus rootstock seedlings in response to boron deficiency by FTIR spectroscopy DOI: 10.1080/14620316.2017.1362327 -
Carbonate confidence 1.0
“cm(cid:3)1 CO235 1651 physisorbed were observed and characterized for adsorbed CO2 and and a peak at 1735 due to carboxylate (CO32(cid:3) cm(cid:3)1 (COOe species.34 ).36 carbonate species ) The peak at 1997 may be due to For Ce0.5ZSM-5 cat”
CO oxidation and 4-nitrophenol reduction over ceria-promoted platinum nanoparticles impregnated with ZSM-5 zeolite DOI: 10.1016/j.jre.2021.07.009 -
Alkyl C-H confidence 1.0
“The protein-to-lipid ratio was also calculated by taking symmetric stretching band at which arises from P-O stretching, for Micrococcus species (Stuart, the ratio of the area of the CH 3 2876cm(cid:2)1 to the area of the CH asymmetric stret”
Use of Fourier transform infrared spectroscopy for rapid comparative analysis of Bacillus and Micrococcus isolates DOI: 10.1016/j.foodchem.2008.08.063 -
Alkyl C-H confidence 1.0
“The frequency range of and the out-of-plane bending vibration of cm(cid:1)1 cm(cid:1)1 3009-2800 is due to CH stretching absorptions, (Guillen & Cabo, 1997b).”
Syahariza 等 - 2005 - Detection of lard adulteration in cake formulation DOI: 10.1016/j.foodchem.2004.10.039 -
Carbonyl (C=O) confidence 1.0
“Peaks at 1696 correspond to the benzoyl carbonyl stretch cm-1 and those at 1721 and 1724 correspond to the acid carbonyl stretch (Taylor and A Zografi, 1997).”
Bandi 等 - 2004 - Preparation of budesonideand indomethacin-hydrox DOI: 10.1016/j.ejps.2004.06.007.
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