What absorbs at 1195 cm⁻¹ in an FTIR spectrum?
A band near 1195 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 1195 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 |
|---|---|---|---|
| Methoxy (OCH3) | 6 | 4 | 1.0 |
| Methacrylate | 5 | 3 | 1.0 |
| C-O single bond | 5 | 3 | 1.0 |
| Acetate | 5 | 3 | 1.0 |
| Alkyl C-H | 2 | 2 | 1.0 |
| Amide | 2 | 2 | 1.0 |
| Phosphorus | 1 | 1 | 1.0 |
| Phosphate (PO4) | 1 | 1 | 1.0 |
| Chitosan | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| Borate | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| S eq o | 1 | 1 | 1.0 |
| N-O bond | 1 | 1 | 1.0 |
| C=n | 1 | 0 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 0 | 1.0 |
| Hydroxyl (O-H) | 1 | 0 | 1.0 |
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 |
|---|---|---|---|
| PVA | 1195, 1660, 2930 | Acetate, Methacrylate, C-O single bond | 1 |
| PMMA | 1195, 1722, 1383 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| SiO2 | 1195, 1739, 699 | Methoxy (OCH3) | 1 |
| CMC | 1195, 1423, 1196 | C-O single bond | 1 |
| biodiesel | 1195, 858, 3470 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| GO | 1195, 1720, 1182 | Methacrylate, Acetate, C-O single bond | 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 1195 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
-
Alkyl C-H confidence 1.0
“higher frequency of the CH asymmetric stretching vibration at 3 2992cm(cid:3)1, 1431cm(cid:3)1, CH bending at the Amide II band at 1195 This result revealed that the Xoo strains had a higher ratio of”
Differentiation in MALDI-TOF MS and FTIR spectra between two pathovars of Xanthomonas oryzae DOI: 10.1016/j.saa.2014.06.056 -
N-O bond confidence 1.0
“Moreover, the peak ranging from 1195 to cm(cid:1)1 4 Stroke (S) 4 -C-O-CThis MO-100.25 1246 is attributed to present in No”
Evaluation of the performance and emission and spectroscopic analysis of an improved soy methyl ester DOI: 10.1039/c9ra04342j -
Methoxy (OCH3) confidence 1.0
“For PVC, C H stretching mode can be S.Rameshetal./SpectrochimicaActaPartA66(2007)1237-1242 1239 Table2 VibrationalmodesandwavenumbersexhibitedbyPMMA Wavenumbers(cm-1) Descriptionofvibrations References C Hstretching 2927-2986 [30,32] C Ostr”
Ramesh 等 - 2007 - FTIR studies of PVCPMMA blend based polymer elect DOI: 10.1016/j.saa.2006.06.012 -
S eq o confidence 1.0
“The new band at 1034 and 1012 corresponds to -SO 3Na group cm-1 while the bands detected at 1195 and 1126 are due to S=O stretching vibration to confirm the presence of function groups responsible for the adsorption of metal ions.”
REMOVAL OF METAL IONS FROM AQUEOUS SOLUTIONS USING CARBOXYMETHYL CELLULOSE/SODIUM STYRENE SULFONATE GELS PREPARED BY RADIATION GRAFTING DOI: 10.1016/j.carbpol.2016.09.049 -
C c single bond confidence 1.0
“(144(cid:3) 284(cid:3) cm(cid:2)1 < < m T C C) and the secaromatic products typical of together with the band at 1195 as (SO(cid:2) ond step associated with decomposition of the main ), evidenced SPEEK perturbation due to”
Sulphonated poly ether ether ketone/aminodiphenylsilandiol composite electrolyte for PEM fuel cells DOI: 10.1002/app.34906 -
Amide confidence 1.0
“In addition, a new weak band in the OC spectrum at 1195 may refer to the (C-N) bond stretching from CPC, with a little shift to a lower frequency than the present one in CPC spectrum [7-11,13].”
Enhanced Coating Protection of C-Steel Using Polystyrene Clay Nanocomposite Impregnated with Inhibitors DOI: 10.3390/polym15020372 -
Acetate confidence 1.0
“The strong bands at 1195 and cm21 would be related to the C-O stretching vibrations of 1120 13C-NMR V.”
Banerjee 等 - 2014 - Melanin from the Nitrogen-Fixing Bacterium Azotoba DOI: 10.1371/journal.pone.0084574 -
Alkyl C-H confidence 1.0
“Photonics 2022, 9, x FOR PEER REVIEW 5 of 17 at 1591.18 cm-1 and 1194.79 cm-1 were due to -CH2 rocking symmetrical stretching, and the crystalline sequence of PVA on C-O stretching vibration.”
Evaluation of Structural and Optical Properties of Graphene Oxide-Polyvinyl Alcohol Thin Film and Its Potential for Pesticide Detection Using an Optical Method DOI: 10.3390/photonics9050300
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