What absorbs at 1200 cm⁻¹ in an FTIR spectrum?
A band near 1200 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 |
|---|---|---|---|
| C-O single bond | 8 | 7 | 0.95 |
| Siloxane (Si-O-Si) | 6 | 6 | 1.0 |
| Carbohydrate | 6 | 6 | 0.8 |
| Silicon-oxygen (Si-O) | 4 | 4 | 0.8 |
| C n single bond | 2 | 2 | 1.0 |
| Borate | 2 | 2 | 0.9 |
| Phosphate (PO4) | 2 | 2 | 0.8 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
| Oxygen heterocycle | 1 | 1 | 0.9 |
| C c single bond | 1 | 1 | 0.9 |
| Nitrogen heterocycle | 1 | 1 | 0.8 |
| Alkyl C-H | 1 | 1 | 0.8 |
| Water (H2O) | 1 | 1 | 0.7 |
| N h | 1 | 1 | 0.6 |
| Carbonyl (C=O) | 1 | 0 | 0.6 |
| Carboxyl (COOH) | 1 | 0 | 0.6 |
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
“The baseline was subtracted from the raw nitrogencooledMCT-Adetector.Forpolarizedinfraredmeasurements,a spectrum and the OH absorption band area was calculated by 1200line/mmzincselenidewiregridpolarizerwasused.Spectrawere acquiredwitha100µ”
Aubaud 等 - 2009 - Calibration of the infrared molar absorption coeff DOI: 10.1016/j.chemgeo.2009.01.001 -
confidence 1.0
“Explicit assignment: same region.”
Rouchon 等 - 2002 - Study of ultrathin silicon oxide films by FTIR-ATR DOI: 10.1002/sia.1335 -
C n single bond confidence 1.0
“Explicitly assigned to C-N band in tricyclazole.”
Lv 等 - 2018 - Rapid and Nondestructive Detection of Pesticide Re DOI: 10.1021/acsomega.8b00339 -
C-O single bond confidence 0.95
“Explicit assignment: 'peaks around 1200 which were assigned to C-O and C-OH'”
Takaesu 等 - 2019 - Micro-milling super-fine powdered activated carbon DOI: 10.1016/j.watres.2019.02.019 -
C n single bond confidence 0.95
“Explicit assignment: 'C-N' at 1200 cm-1.”
Ngo 等 - 2020 - Improvement of Hydrophilicity for Polyamide Compos DOI: 10.1155/2020/6641225 -
confidence 0.9
“Explicit: 'presence of Si-C bonds can be clearly seen from the IR absorption... T peak around 1200 cm-1'”
Chew 等 - 2002 - Hydrogenated amorphous silicon carbide deposition DOI: 10.1063/1.1500418 -
C c single bond confidence 0.9
“Explicit assignment: 'C-C bonds ... formed at 1200'”
Purkuncoro 等 - 2019 - Deposition of Carbon Thin Film by Means of a Low-F DOI: 10.1088/1757-899X/515/1/012041 -
confidence 0.9
“Explicit assignment: 'bandas de 1200 e 700 são atribuídos a modos de vibração da rede de sílica'.”
Rovedder Junior 等 - 2021 - Physical and chemical properties of Pinus elliotti DOI: 10.18671/scifor.v49n130.24
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