What absorbs at 1325 cm⁻¹ in an FTIR spectrum?
A band near 1325 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 |
|---|---|---|---|
| C c single bond | 2 | 2 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| Nitrate | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 0 | 1.0 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
Nitrate confidence 1.0
“Note that a sharp band at 1325 cm-1, around 1325 signifying that 2,4-DP anion has associates with the nitrate stretching vibration.”
Bohari 等 - 2022 - Synthesis and Characterization of 2,4-Dichlorophen DOI: 10.22146/ijc.73546 -
confidence 1.0
“Raman band at 1325 is assigned to CN+· stretching vibration of nitrogen cation radical (forming due to protonation of PANI).”
Jin 等 - 2018 - Polymer anode used in hydrometallurgy Anodic beha DOI: 10.1016/j.hydromet.2018.01.020 -
C c single bond confidence 1.0
“1378m 1378m -OH bending, C-O-H bending, -OH bending, C-O-H bending, and C-H bending and C-H bending w w 1320w 1320w 1320w 1322w 1322w 1320w 1317 1317 C-c, and C-U skeletal vibration C-c, rrnd C-U skeletal vibration 1325 w 1325 w”
Liu 等 - 2006 - Characterization of the basidiomycetes Thelephora DOI: 10.1117/12.710905 -
Alkyl C-H confidence 1.0
“A peak at 1325 is due to -CH wagging.”
Synthesis, Structural, Optical, Electrical and Thermal Studies of Poly(vinyl alcohol)/CdO Nanocomposite Films DOI: 10.1007/s10904-017-0662-1 -
C c single bond confidence 1.0
“As mentioned earlier for the neat PEO, the absorption bands that correspond to correspond to the C-C bond are centered at 1350 and 1325 cm-1 for the gauche and trans conformation, cm-1 gauche trans the C-C bond are centered at 1350 and 1325”
Bollas 等 - 2017 - Polymer Conformation under Confinement DOI: 10.3390/polym9020073
Have a spectrum with this band?
Upload your FTIR spectrum and get a full interpretation report — peak assignments with literature citations, library matches, and a confidence-rated evidence chain — in seconds.
Interpret my spectrum