What absorbs at 3343 cm⁻¹ in an FTIR spectrum?
A band near 3343 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) | 4 | 4 | 1.0 |
| S eq o | 1 | 1 | 1.0 |
| Carbohydrate | 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
“LLM confirmed rule peak-group candidate”
Preparation and characterization of irradiated carboxymethyl sago starch-acid hydrogel and its application as metal scavenger in aqueous solution DOI: 10.1016/j.carbpol.2015.11.028 -
Hydroxyl (O-H) confidence 1.0
“theoriginoftheobservednormalmodesofvibration.The stretching mode from 3304 of the boronic acid O-H cm-1 DFT model of glucose bound to PBA does not predict a component of PBA to 3343 of the stretching cm-1.”
Brewer 等 - 2004 - Infrared detection of a phenylboronic acid termina DOI: 10.1021/la035037m -
Carbohydrate confidence 1.0
“3343cm-1 2892cm-1 2y¼15(cid:2) untreated samples shows three distinct peaks at (cellulose I) to (cela peak shift at (10(cid:2) 17(cid:2) lulose II)-related gOH.”
Khajavi 等 - 2013 - Alkali treatment of cotton yarns with ultrasonic b DOI: 10.1177/0040517512467077 -
Hydroxyl (O-H) confidence 1.0
“first, an O-H band at 3343 corresponding to phenolic groups from the extract, was observed.”
Synthesis and Catalytic Evaluation of Silver Nanoparticles Synthesized with Aloysia triphylla Leaf Extract DOI: 10.1007/s10876-016-1062-3 -
S eq o confidence 1.0
“Any abrupt or drastic change in the 2 cm-1, amine at 3343.3 S=O stretching asymmetric band thermal behavior of rather the drug or polymer may”
Jelvehgari 等 - 2015 - Experimental Design to Predict Process Variables i DOI: 10.15171/apb.2015.033 -
Hydroxyl (O-H) confidence 1.0
“LLM confirmed rule peak-group candidate”
Li 等 - 2023 - Effect of Furfurylation on Bamboo-Scrimber Composi DOI: 10.3390/ma16072931
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