What absorbs at 1260 cm⁻¹ in an FTIR spectrum?
A band near 1260 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 8 cited sources
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Silicon carbon | 6 | 6 | 1.0 |
| C n single bond | 4 | 4 | 1.0 |
| Alkyl C-H | 3 | 1 | 1.0 |
| C-O single bond | 2 | 1 | 1.0 |
| Phosphate (PO4) | 2 | 1 | 0.9 |
| Chlorine | 1 | 1 | 1.0 |
| S s | 1 | 1 | 1.0 |
| Sulfate (SO4) | 1 | 1 | 0.95 |
| C c single bond | 1 | 1 | 0.9 |
| Oxygen heterocycle | 1 | 1 | 0.8 |
| Amide | 1 | 1 | 0.8 |
| Carbohydrate | 1 | 1 | 0.7 |
| Ester | 1 | 0 | 0.9 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
C n single bond confidence 1.0
“Attribute to C-N stretch.”
Abdi 等 - 2022 - Improvement of anti-corrosion performance of an ep DOI: 10.1038/s41598-022-14854-y -
S s confidence 1.0
“explicit assignment in text”
An 和 Zhang - 2020 - A Study of Temperature Effect on the Xanthate's Pe DOI: 10.3390/min10050426 -
Chlorine confidence 1.0
“Explicitly assigned as 2Cl band.”
Ardelean 等 - 2022 - New Polymeric Adsorbents Functionalized with Amino DOI: 10.3390/molecules27092894 -
Silicon carbon confidence 1.0
“Explicit assignment in text.”
Bao 等 - 2018 - Manufacturing and characterization of long-acting DOI: 10.1016/j.ijpharm.2018.09.004. -
Silicon carbon confidence 1.0
“Explicit assignment: 'absorption peak at 1,260 corresponds to Si-C'”
Chen 等 - 2021 - Synthesis of a novel UV-curable prepolymer 1,3-bis DOI: 10.2478/msp-2021-0030 -
C-O single bond confidence 1.0
“Explicitly assigned as part of ether bonds.”
Lv 等 - 2017 - The Adsorption Capacity of GONsCMCFe3O4 Magnetic DOI: 10.3390/ma10010058 -
confidence 1.0
“explicit assignment”
Pei 等 - 2019 - Removing Pb(II) Ions from Aqueous Solution by a Pr DOI: 10.3390/polym11030548 -
Silicon carbon confidence 0.95
“Explicit assignment in text”
Ashby 等 - 2013 - The effect of alkyl chain length on the level of c DOI: 10.1007/s11051-013-1425-8
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