What absorbs at 992 cm⁻¹ in an FTIR spectrum?
A band near 992 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 6 cited sources
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| C c single bond | 1 | 1 | 1.0 |
| Sulfate (SO4) | 1 | 1 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
Silicon-oxygen (Si-O) confidence 1.0
“LLM confirmed rule peak-group candidate”
Kim 等 - 2022 - Removal of Methyl Red from Aqueous Solution Using DOI: 10.3390/ijerph19159030 -
Carbohydrate confidence 1.0
“4000 3500 3000 2500 2000 1500 1000 stronger hydrogen bonding could be concluded from the double (cm-1) Wave Number 2919cm-1 2887cm-1 999cm-1 992cm-1 peaks at to and to in nanocomposites samples when compared with pure starch (Ding, Ainswort”
Glycerol/starch/Na+-montmorillonite nanocomposites: A XRD, FTIR, DSC and 1H NMR study DOI: 10.1016/j.carbpol.2010.10.018 -
confidence 1.0
“ip t cm-1 Figure 2: The intensity of the peak at ~992 is strongly correlated to the amorphous calcium A u”
Fourier Transform Infrared Spectroscopy of Developing Bone Mineral: From Amorphous Precursor to Mature Crystal DOI: 10.1039/c9an01588d. -
Alkene (C=C) confidence 1.0
“The peak observed at 992 is common peak for all the samples, which arises from the A g VMO symmetric vibrations of the double bond, which is 3 also present in pure V 2O [27].”
Vijayakumar 等 - 2004 - Li-7 MAS-NMR and vibrational spectroscopic investi DOI: 10.1016/j.ssi.2003.12.008 -
Sulfate (SO4) confidence 1.0
“The strong band at 992 in particular, indicates that the major part of the sample consists of a sulfate salt.”
Kiefer 等 - 2018 - Infrared Spectroscopic Analysis of the Inorganic D DOI: 10.3390/en11040798 -
C c single bond confidence 1.0
“On the other hand, the bands at cm-1 cm-1 992 and 986 associated ribose phosphate main chain and stretching vibration C-C of DNA backbone, cm-1 cm-1 respectively, changed their conformation in the COVID-19 group.”
Martinez-Cuazitl 等 - 2021 - ATR-FTIR spectrum analysis of saliva samples from DOI: 10.1038/s41598-021-99529-w
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