What absorbs at 1495 cm⁻¹ in an FTIR spectrum?
A band near 1495 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 1495 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 |
|---|---|---|---|
| Alkyl C-H | 5 | 5 | 1.0 |
| Aromatic ring | 5 | 4 | 1.0 |
| Ring structure | 4 | 4 | 1.0 |
| C-O single bond | 3 | 2 | 1.0 |
| Secondary amine | 2 | 2 | 1.0 |
| C n single bond | 2 | 2 | 1.0 |
| Amide | 2 | 2 | 1.0 |
| Hydroxyl (O-H) | 2 | 2 | 1.0 |
| C=n | 2 | 2 | 1.0 |
| Methoxy (OCH3) | 2 | 1 | 1.0 |
| Methacrylate | 2 | 1 | 1.0 |
| Acetate | 2 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Bromine | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Lewis acid site | 1 | 1 | 1.0 |
| N-O bond | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Carbonate | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Nitrogen heterocycle | 1 | 1 | 1.0 |
| Boron nitrogen | 1 | 1 | 1.0 |
| N h | 1 | 1 | 0.9 |
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 |
|---|---|---|---|
| PVP | 1495, 2983, 1648 | Alkyl C-H | 2 |
| PVA | 1495, 1660, 2930 | Alkyl C-H, C-O single bond | 1 |
| chitosan | 1495, 1650, 1655 | Alkyl C-H, C-O single bond | 1 |
| HCl | 1495, 1708, 1032 | Aromatic ring, 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 1495 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
“3080cm-1 1590cm-1 1450cm-1 and Raman band at are assigned to C H stretching and the peaks at 1495 and are due at 1600, vibrations.”
Nagabalasubramanian 等 - 2009 - FTIR and FT Raman spectra, vibrational assignments DOI: 10.1016/j.saa.2009.02.044 -
Hydroxyl (O-H) confidence 1.0
“At 1650 the hydroxyl group bending vibrations were identified for all Thebandsat1322and1495cm-1 belongtovibrationsofC-OandC=C[27].”
New Hybrid PVC/PVP Polymer Blend Modified with Er2O3 Nanoparticles for Optoelectronic Applications DOI: 10.3390/polym15030684 -
Alkyl C-H confidence 1.0
“1601 amide II 1530 -C=Caromatic stretching 1495 C-H bending”
Benbow 等 - 2018 - A Novel Soft Contact Piezo-Controlled Liquid Cell DOI: 10.1038/s41598-018-34673-4 -
Boron nitrogen confidence 1.0
“1664 1664 N-B-N stretching 1495 1496 1448 1450 C-H bending of CH”
Layer-by-layer thin films of polyaniline alternated with natural rubber and their potential application as a chemical sensor DOI: 10.1007/s10965-016-1170-7 -
Aromatic ring confidence 1.0
“(cm-1): FTIR spectra 3261 (stretching vibration of-OH and -NH groups), 1597 (typical aromatic skeletal vibration), 1495 (stretching of disubstituted benzene ring), 796 (N-H out-of-plane bending vibration).”
Developing Further Versatility in Benzoxazine Synthesis via Hydrolytic Ring-Opening DOI: 10.3390/polym12030694 -
C=n confidence 1.0
“Moreover, the band centered at 1495 corresponds to the characteristic vibration of C=N (pyridine ring) of PVP [36].”
Elhosiny Ali 等 - 2022 - Microstructure Study and LinearNonlinear Optical DOI: 10.3390/polym14091741 -
Aromatic ring confidence 1.0
“absorptions at 1450, 1495 cm-1, and 1610 which can be ascribed to the aromatic skeletal ring breathing vibrations, and aromatic”
Germinario 等 - 2016 - Chemical characterisation of spray paints by a mul DOI: 10.1016/j.microc.2015.04.016 -
confidence 1.0
“1495 cm-1 and amide carbonyl (C=O) stretching vibrations at ~1670 cm-1 [24-27].”
Electrospun Fibres of Chitosan/PVP for the Effective Chemotherapeutic Drug Delivery of 5-Fluorouracil DOI: 10.3390/chemosensors9040070
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