What absorbs at 3520 cm⁻¹ in an FTIR spectrum?
A band near 3520 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 |
|---|---|---|---|
| Hydroxyl (O-H) | 5 | 5 | 1.0 |
| N-O bond | 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
“The series of IR spectroH-O-H cm-1 (symmetric metric stretching) and 3520 scopic studies on the phase transitions of PVME, PiPA, H-O-Hstretching).20TheO-Hstretchingbandsofwater andotherpoly(N-substitutedacrylamide)sinwatershows (>50 in conc”
Maeda - 2001 - IR spectroscopic study on the hydration and the ph DOI: 10.1021/la001346q -
Hydroxyl (O-H) confidence 1.0
“cm-1 and the broad band at 3520 may be associated with the per2θ [O] turbation of OH groups through the surrounding by lattice defects or extra-lattice oxygen [49].”
IR study of iridium bonded to perturbed silanol groups of Pt-HZSM5 for n-pentane isomerization DOI: 10.1016/j.apcata.2011.12.039 -
N-O bond confidence 1.0
“on cm(cid:1)1 of electron from GO structure which was accepted by the elecThebroad peakat3520 corresponding tothe OHof NC Downloaded Commons cm(cid:1)1 decientO-NO shied groups(donor-accepterinteraction)of tron in NC/DEGDN sample weakened”
Yahya 等 - 2019 - Interaction and thermal studies on graphene oxide DOI: 10.1039/c9ra07717k -
Hydroxyl (O-H) confidence 1.0
“LLM confirmed rule peak-group candidate”
Preparation and Composition Optimization of PEO:MC Polymer Blend Films to Enhance Electrical Conductivity DOI: 10.3390/polym11050853 -
Hydroxyl (O-H) confidence 1.0
“The introduction of Mn into SiBEA zeolite led to the strong cm-1 decrease in the intensity of the bands at 3520 and 3705 related to OH groups forming”
Incorporation of Mn into the vacant T-atom sites of a BEA zeolite as isolated, mononuclear Mn: FTIR, XPS, EPR and DR UV-Vis studies DOI: 10.1039/c6cp01713d -
Hydroxyl (O-H) confidence 1.0
“However, a small shift of the OH band (previously centred at 3520 cm-1) cm-1 3520 to c.”
De Sa 等 - 2021 - Tracing Poly(Vinyl Acetate) Emulsions by Infrared DOI: 10.3390/polym13213609
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