What absorbs at 1401 cm⁻¹ in an FTIR spectrum?
A band near 1401 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-O single bond | 2 | 2 | 1.0 |
| Carbonyl (C=O) | 2 | 2 | 0.9 |
| N h | 1 | 1 | 0.9 |
| Alkyl C-H | 1 | 1 | 0.8 |
| Carboxyl (COOH) | 1 | 1 | 0.8 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
C-O single bond confidence 1.0
“Explicit assignment: '1401 ... attributed to C-O'”
Li 等 - 2020 - Magnetic responsive Thermomyces lanuginosus lipase DOI: 10.1016/j.mtcomm.2020.101197 -
C-O single bond confidence 1.0
“Text: '1401cm-1 presents the C-OH stretching vibration'”
Xu 等 - 2013 - Preparation, Characterization, and Properties of I DOI: 10.1155/2013/319840 -
Carbonyl (C=O) confidence 0.9
“Explicit assignment from text.”
Fengou 等 - 2019 - Estimation of Minced Pork Microbiological Spoilage DOI: 10.3390/foods8070238 -
N h confidence 0.9
“stretching and scissoring vibration of NH”
Xu 等 - 2022 - Durable and high-efficiency casein-derived phospho DOI: 10.21203/rs.3.rs-884727/v1 -
Carboxyl (COOH) confidence 0.8
“Negative band at 1401 cm-1 arises mainly from D170, a carboxylate residue.”
Debus - 2016 - Identifying carboxylate ligand vibrational modes i DOI: 10.1073/pnas.1615794113 -
Alkyl C-H confidence 0.8
“Text states 'peak at 1401 corresponds to CH2, as well as scis- structures. The peak at 1401 C=O'.”
Guleken 等 - 2022 - Characterization of Covid-19 infected pregnant wom DOI: 10.1016/j.talanta.2021.122916
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