What absorbs at 1104 cm⁻¹ in an FTIR spectrum?
A band near 1104 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
Quick answer
A band near 1104 cm⁻¹ is usually interpreted by checking which functional groups repeatedly co-occur there in the literature, then confirming at least one or two additional peaks in the same sample. This page ranks those assignments by accumulated evidence rather than by a single fixed textbook rule.
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Silicon-oxygen (Si-O) | 4 | 4 | 1.0 |
| Methoxy (OCH3) | 3 | 3 | 1.0 |
| Methacrylate | 3 | 3 | 1.0 |
| C-O single bond | 3 | 3 | 1.0 |
| Acetate | 3 | 3 | 1.0 |
| Siloxane (Si-O-Si) | 2 | 2 | 1.0 |
| Carbohydrate | 2 | 2 | 1.0 |
| Carbonyl (C=O) | 2 | 2 | 0.7 |
| Lignin | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
| Ammonium | 1 | 1 | 1.0 |
| Nitrate | 1 | 1 | 1.0 |
| Nitrogen heterocycle | 1 | 1 | 0.8 |
| Phosphorus | 1 | 0 | 1.0 |
| Phosphate (PO4) | 1 | 0 | 1.0 |
| Sulfate (SO4) | 1 | 0 | 0.8 |
Ranking reflects accumulated literature evidence, not a single fixed rule. Always confirm against your sample context.
Possible materials
| Material | Supporting peaks | Overlapping groups | Cited sources |
|---|---|---|---|
| cellulose | 1104, 1735, 1650 | Methacrylate, C-O single bond, Methoxy (OCH3) | 1 |
| Fe3O4 | 1104, 2358, 1673 | Methacrylate, Silicon-oxygen (Si-O) | 1 |
| iron oxide | 1104, 1130, 891 | Methoxy (OCH3), Methacrylate, C-O single bond | 1 |
| Fe3O4 nanoparticles | 1104, 1673, 1470 | Methacrylate | 1 |
| iron oxide nanoparticles | 1104, 2972, 528 | Methacrylate, Methoxy (OCH3), C-O single bond | 1 |
| DNA | 1104, 1712, 1660 | Methacrylate, C-O single bond, Methoxy (OCH3) | 1 |
Materials are shown only when the same literature pool supports this band and at least one additional characteristic peak.
Spectrum logic
This band becomes meaningful only when read with its neighboring peaks. In practice, analysts first look at the assignments above, then check whether the same sample also shows other peaks expected for the same structural motif. A lone band near 1104 cm⁻¹ is usually not enough for material identification by itself.
Real-world usage
This type of query is common in polymer identification, unknown plastic screening, QC troubleshooting, recycled-material verification, and literature-backed peak assignment review.
Common mistakes
- Treating one isolated band as proof of a material without checking at least one or two supporting peaks.
- Ignoring overlap: multiple functional groups can contribute near the same wavenumber.
- Skipping validation when additives, blends, oxidation, or contamination may distort the spectrum.
Verification advice
When ambiguity remains, validate the hypothesis with DSC, GC-MS, or TGA, especially for blends, degraded samples, and filled polymers.
Literature behind these assignments
-
confidence 1.0
“-1 spectrum (FTIR) corresponds to the Fe-O bond and the peak at 1104.1 cm corresponds to a characteristic peak of PEG binding to the iron core.”
ENHANCEMENT OF THERMAL IMAGING BY IRON OXIDE NANOPARTICLE – PRELIMINARY STUDY DOI: 10.1016/j.bcab.2018.12.005 -
confidence 1.0
“Peaks at 1104, 1033, and cm-1 43962 are assigned to the stretching modes of PO , and cm-1 Ca(NO 3) 2·4H 2O, (NH 4) 2HPO and Zn(NO 3) 2·6H 2O were all the peaks at 603 and 565 are attributable to the bending 4”
Investigation of the effect of doped Zn atom to the hydroxyapatite based on experimental method and first-principles calculations DOI: 10.1007/s41779-019-00430-7 -
Acetate confidence 1.0
“The local peak at 1104 representing C-O, C-O-C stretch, and ring vibrations is attributed mostly to cellulose [42,43].”
Bednarek 等 - 2020 - Exploring the Biochemical Origin of DNA Sequence V DOI: 10.3390/ijms21165770 -
Acetate confidence 1.0
“Moreover, the peak cm-1 cm-1 at 1104 corresponds to the C-O stretching of the C-O-C bond and the peak at 1343 is due to cm-1 the O-H bending of the C-OH group.”
Durazzo 等 - 2018 - Qualitative Analysis of Traditional Italian Dishes DOI: 10.3390/su10114112 -
Hydroxyl (O-H) confidence 1.0
“After thermal modification, cm-1 an increase defined in the peak at 1104 due to OH association of cellulose units.”
Gonultas 和 Candan - 2018 - CHEMICAL CHARACTERIZATION AND FTIR SPECTROSCOPY OF DOI: 10.4067/S0718-221X2018005031301 -
Alkyl C-H confidence 1.0
“The difference between the composition wt.% Additionally, the two peaks at 1103.90 and 924.65 at the two positions was minimal, which confirms the succan be assigned to the in-plane C-H bending vibrations, cm-1 cessful synthesis of both MOF”
Ibrahim 等 - 2018 - Synthesis of Metal-Organic Framework from Iron Nit DOI: 10.1166/jnn.2018.15373 -
Acetate confidence 1.0
“and the peak at 1057 moved to 1104 cm-1, which was the C-O stretching vibration of alcohols, indicating the large release of alcohol after liquefaction (Zhang and Huang 2006;”
Jin 等 - 2021 - Preparation of Microspheres and Microfiber Membran DOI: 10.1002/app.39967 -
Water (H2O) confidence 1.0
“H-OH bending of adsorbed water 1104 Si-O stretching 1104 Si-O stretching 1036 Si-O-Si stretching 1036 Si-O-Si stretching 909”
SO42-/Sn-MMT Solid Acid Catalyst for Xylose and Xylan Conversion into Furfural in the Biphasic System DOI: 10.3390/catal7040118
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