What absorbs at 1430 cm⁻¹ in an FTIR spectrum?
A band near 1430 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 1430 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 | 35 | 35 | 1.0 |
| Carboxyl (COOH) | 14 | 12 | 1.0 |
| Methacrylate | 9 | 9 | 1.0 |
| Acetate | 9 | 9 | 1.0 |
| Carbohydrate | 9 | 9 | 1.0 |
| Hydroxyl (O-H) | 9 | 9 | 1.0 |
| C-O single bond | 8 | 8 | 1.0 |
| Alkene (C=C) | 6 | 6 | 1.0 |
| Amide | 6 | 6 | 1.0 |
| Carbonate | 6 | 4 | 1.0 |
| Methoxy (OCH3) | 5 | 5 | 1.0 |
| Carbonyl (C=O) | 5 | 5 | 1.0 |
| N h | 5 | 4 | 1.0 |
| Water (H2O) | 4 | 4 | 1.0 |
| Ketone | 4 | 4 | 1.0 |
| Ester | 4 | 4 | 1.0 |
| C c single bond | 3 | 3 | 1.0 |
| Secondary amine | 2 | 2 | 1.0 |
| Aromatic ring | 2 | 2 | 1.0 |
| N n bond | 2 | 1 | 1.0 |
| Protein | 1 | 1 | 1.0 |
| Lipid | 1 | 1 | 1.0 |
| Ring structure | 1 | 1 | 1.0 |
| Sulfur heterocycle | 1 | 1 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
| Amine primary | 1 | 1 | 1.0 |
| Borate | 1 | 1 | 1.0 |
| Nitrate | 1 | 1 | 1.0 |
| C=n | 1 | 1 | 1.0 |
| Nitrogen heterocycle | 1 | 1 | 1.0 |
| Lignin | 1 | 1 | 1.0 |
| Methyl | 1 | 1 | 1.0 |
| Hydrogen bond | 1 | 1 | 1.0 |
| Amino acid | 1 | 1 | 1.0 |
| Fatty acid | 1 | 1 | 1.0 |
| Ammonium | 1 | 1 | 1.0 |
| Carbon dioxide | 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 |
|---|---|---|---|
| PVA | 1430, 1660, 2930 | Alkyl C-H, Acetate, Methacrylate | 1 |
| poly(vinyl alcohol) | 1430, 1700, 2993 | Acetate, Methacrylate, Alkyl C-H | 1 |
| plasma | 1430, 1656, 1650 | Alkyl C-H, Carboxyl (COOH), Methacrylate | 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 1430 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
-
Carbohydrate confidence 1.0
“microfibrils.Thepreferred pulpcharacteristicsfor paper productionare Moreover, the characteristic bands for amorphous cellulose at the presence of long fibres with a large diameter that provide me897cm-1, 1273cm-1, 1370cm-1 1430cm-1 and in”
Exploring the lignolytic potential of a new laccase producing strain Kocuria sp. PBS-1 and its application in bamboo pulp bleaching DOI: 10.1016/j.ibiod.2019.104726 -
Hydroxyl (O-H) confidence 1.0
“cm-1 ascribed to -OH stretching, while the band in the vicinity of 1430 can be assigned cm-1 to the -OH in plane deformation [14].”
Indarti 等 - 2019 - Silylation of TEMPO oxidized nanocellulose from oi DOI: 10.1016/j.ijbiomac.2019.05.161 -
Hydroxyl (O-H) confidence 1.0
“Text: '1,430 cm-1, vibration of OH; the bending mode of CH2'”
Liu 等 - 2014 - Discrimination of blue ballpoint pen inks in Chine DOI: 10.1108/PRT-12-2012-0089 -
Alkyl C-H confidence 1.0
“LLM confirmed rule peak-group candidate”
Structural, thermal and electrical properties of PVA–LiCF3SO3 polymer electrolyte DOI: 10.1016/j.jnoncrysol.2010.08.011 -
N h confidence 1.0
“In addition, a series of overlapping bands from cm-1 +-stretching about 3500 to 2700 characteristic of the NH vibrations, a main band at ~1430 and 4 cm-1 +-bending (ν a shoulder at ~1460 that were associated to the NH vibration 4) were also”
Tobelite and NH4+-rich muscovite single crystals from Ordovician Armorican sandstones (Brittany, France): Structure and crystal chemistry DOI: 10.2138/am.2012.4023 -
Water (H2O) confidence 1.0
“The headgroup vibrations (e.g., peaks at 1430 and 1480 cm-1) For gold nanospheres, TGA plot and its derivative are due to their close proximity to the water molecules compared with gold NRs and are shown in Figure 7.”
Nikoobakht 和 El-Sayed - 2001 - Evidence for bilayer assembly of cationic surfacta DOI: 10.1021/la010530o -
Ammonium confidence 1.0
“no adsorbed species remained at only 573 K, as all of the other cm-1 The peak located at 1430 was attributed to ammonia bound materials had peaks remaining at this temperature.”
Pena 等 - 2004 - Identification of surface species on titania-suppo DOI: 10.1021/jp0313122 -
Fatty acid confidence 1.0
“0.1 cm-1 (glucose, lactose and glycerol), the peaks at 1360-1430 0.05 COOare attributed to of amino acids, and the peak at 1430cm-1 0 1480 is attributed to fatty acids, phospholipids and”
Singh 等 - 2010 - Spectroscopic techniques as a diagnostic tool for DOI: 10.1007/s12206-010-0524-z
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