What absorbs at 1435 cm⁻¹ in an FTIR spectrum?
A band near 1435 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 1435 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 | 12 | 11 | 1.0 |
| Methacrylate | 6 | 6 | 1.0 |
| Acetate | 6 | 6 | 1.0 |
| Methyl | 5 | 5 | 1.0 |
| Methoxy (OCH3) | 5 | 5 | 1.0 |
| Carboxyl (COOH) | 5 | 4 | 1.0 |
| Carbonate | 4 | 4 | 1.0 |
| Ammonium | 4 | 3 | 1.0 |
| Aromatic ring | 3 | 3 | 1.0 |
| Amide | 3 | 3 | 1.0 |
| Ester | 3 | 3 | 1.0 |
| C c single bond | 2 | 2 | 1.0 |
| Secondary amine | 2 | 2 | 1.0 |
| Ketone | 2 | 2 | 1.0 |
| Carbonyl (C=O) | 2 | 2 | 1.0 |
| Metal oxygen | 2 | 2 | 1.0 |
| Nitrate | 2 | 2 | 1.0 |
| Hydroxyl (O-H) | 2 | 1 | 1.0 |
| Bromine | 2 | 1 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Chlorine | 1 | 1 | 1.0 |
| Fatty acid | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Acetyl | 1 | 1 | 1.0 |
| Hydrogen bond | 1 | 1 | 1.0 |
| C-O single bond | 1 | 1 | 1.0 |
| Bronsted acid site | 1 | 0 | 1.0 |
| Water (H2O) | 1 | 0 | 1.0 |
Ranking reflects accumulated literature evidence, not a single fixed rule. Always confirm against your sample context.
Possible materials
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 1435 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
-
Bromine confidence 1.0
“12) exhibit dominant peaks at 1435 and 1714 The peak cm-1is (cid:3) at 1435 assigned to the 4(F) bending mode of Brönsted acid”
Low-temperature selective catalytic reduction of NO with NH3 over V/ZrO2 prepared by flame-assisted spray pyrolysis: Structural and catalytic properties DOI: 10.1016/j.apcatb.2012.08.012 -
Acetate confidence 1.0
“The band at 1435 cm-1 of the DES1 that corresponded to CH3 was associated with ChCL [38].”
Can 等 - 2023 - Choline Chloride-Based Deep Eutectic Solvent-Treat DOI: 10.3390/f14030569 -
Acetate confidence 1.0
“In contrast, the paramecompletely cm-1 introduction of acetyl groups weakens the formation of interand ters including peaks associated with the C O at 1733 and cm-1, hydrogen bonds and gives rise to the disruption of intramolecular 1435 and”
Synthesis, optimization and characterization of acetylated corn starch with the high degree of substitution DOI: 10.1016/j.ijbiomac.2013.04.080 -
Nitrate confidence 1.0
“The peak at 1435 is assigned due a value of 2 and 1/2 for direct allowed and indirect allowed transi2O and the broad to the residual nitrate and organic matter in Y (˛E)2 3 respectively.”
Jayaramaiah 等 - 2011 - Thermoluminescence studies of solution combustion DOI: 10.1016/j.matchemphys.2011.06.025 -
Metal oxygen confidence 1.0
“The characteristic cm-1 peak observed at 875 is attributed to stretching frequency of Y-O, the peak at 1435 cm-1 3:Eu3+ is assigned due to the residual nitrate and organic matter in Y 2O and the peak cm-1 is corresponding to the stretching”
Jayaramaiah 等 - 2015 - Luminescence performance of europium-doped yttrium DOI: 10.1016/j.jlumin.2014.08.003 -
Aromatic ring confidence 1.0
“In addition, a transmittance peak at 1435 was identified and it showed stretching vibration of the aromatic group from ammonium.”
International Conference on Innovation on Polymer Science and Technology DOI: 10.1088/1757-899X/223/1/012051 -
confidence 1.0
“Fourier Transform Infrared (FTIR) results showed a peak at 1435 for all ceramics that attributed to Ba-Ti-O.”
Structural and radiation shielding properties of BaTiO3 ceramic with different concentrations of Bismuth and Ytterbium DOI: 10.1016/j.ceramint.2020.08.055 -
Alkyl C-H confidence 1.0
“Besides, affected TPA's 1435cm-1 1338cm-1 both during conversion to TPA, resulting in and bands are assigned to -CH scissor2”
Nahar 等 - 2022 - A Modified Hydrolysis Method of Decolorizing React DOI: 10.1155/2022/4325506
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