What absorbs at 3139 cm⁻¹ in an FTIR spectrum?
A band near 3139 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 |
|---|---|---|---|
| N h | 4 | 3 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| Amide | 1 | 0 | 1.0 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
N h confidence 1.0
“Explicit assignment in text”
Novel Copper(II) Complexes with N4,S-Diallylisothiosemicarbazones as Potential Antibacterial/Anticancer Drugs DOI: 10.3390/inorganics11050195 -
N h confidence 1.0
“[M-H]+, 3O+: m/z: calcd for C 16H 11ClN 296.06, 2, NH stretch), 3138.79, 3037.49 3414.20, 3353.32 (NH TOF-MS (C≡N), M+ m/z: required for C), 1512.23, 1479.26 found: 296.58 EI-MS (Ar CH), 2182.38 1643.03 (C 3O+: C”
Development of an Efficient, One-Pot, Multicomponent Protocol for Synthesis of 8-Hydroxy-4-Phenyl-1,2-Dihydroquinoline Derivatives DOI: 10.1002/jhet.4193 -
N h confidence 0.8
“Part of region 3368-3139 assigned to ν(NH).”
El-Sayed 等 - 2021 - PREPARATION, SPECTROSCOPIC, THERMAL AND MOLECULAR DOI: 10.4314/bcse.v35i2.13
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