What absorbs at 1971 cm⁻¹ in an FTIR spectrum?
A band near 1971 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 3 cited sources
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Hydroxyl (O-H) | 2 | 2 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| N-O bond | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
confidence 1.0
“nitrogen atmosphere ascribed to intermolecular H-O-H stretching (Bikales & Segal, 1971;”
Toledano-Thompson 等 - 2005 - Characterization of henequen cellulose microfibers DOI: 10.1016/j.carbpol.2005.06.024 -
Aromatic ring confidence 1.0
“These peaks In addition, the peaks at 1971 2177 and 2941 are similar to the ones observed for could be attributed to aromatic rings, carboxylic acid groups (O-H), and alkane groups (C-H) in the the CNTs, indicating the presence of CNTs in t”
Performance of Carbon Nanotube/Polysulfone (CNT/Psf) Composite Membranes during Oil–Water Mixture Separation: Effect of CNT Dispersion Method DOI: 10.3390/membranes7010014 -
Alkyl C-H confidence 1.0
“The band at is C-H stretching vibration (Stevenson and Goh, 1971;”
Zhang 等 - 2019 - Secondary organic aerosol formation from OH-initia DOI: 10.5194/acp-19-15007-2019
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