What absorbs at 1530 cm⁻¹ in an FTIR spectrum?
A band near 1530 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 1530 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 |
|---|---|---|---|
| Amide | 21 | 16 | 1.0 |
| N h | 11 | 11 | 1.0 |
| Secondary amine | 9 | 7 | 1.0 |
| Ring structure | 8 | 7 | 1.0 |
| N-O bond | 7 | 4 | 1.0 |
| Aromatic ring | 6 | 6 | 1.0 |
| Alkyl C-H | 6 | 5 | 1.0 |
| C n single bond | 5 | 4 | 1.0 |
| C=n | 4 | 4 | 1.0 |
| Carboxyl (COOH) | 4 | 3 | 1.0 |
| Methacrylate | 3 | 3 | 1.0 |
| Acetate | 3 | 3 | 1.0 |
| Carbonyl (C=O) | 3 | 3 | 1.0 |
| Alkene (C=C) | 2 | 2 | 1.0 |
| Methoxy (OCH3) | 2 | 2 | 1.0 |
| C-O single bond | 2 | 2 | 1.0 |
| C c single bond | 2 | 2 | 1.0 |
| Protein | 2 | 2 | 1.0 |
| Hydroxyl (O-H) | 2 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Carbonate | 1 | 1 | 1.0 |
| Urethane | 1 | 1 | 1.0 |
| N n bond | 1 | 1 | 1.0 |
| Ammonium | 1 | 1 | 1.0 |
| Protein random coil | 1 | 1 | 1.0 |
| Nitro (NO2) | 1 | 1 | 0.9 |
| Hydrogen bond | 1 | 0 | 1.0 |
| Fatty acid | 1 | 0 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 0 | 1.0 |
| Silicon (Si) | 1 | 0 | 1.0 |
| Amino acid | 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 |
|---|---|---|---|
| bio-based | 1530, 1720, 1740 | Amide, N h | 1 |
| diamond | 1530, 1378, 1332 | Amide, Secondary amine | 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 1530 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
“v) the presence of the N-H bending corresponding to the amide II of PNIPAM is detected at 1530 cm-1;”
Bongiovanni Abel 等 - 2019 - Synthesis of a Smart Conductive Block Copolymer Re DOI: 10.3390/polym11111744 -
Amide confidence 1.0
“cm-1 1086 C-N stretching in amines, 1530 C=C Authors' contributions cm-1 stretching, 1602 C=N stretching (in ring), MHhasdesignedandsupervisedheprojectedwhileMZhasdonethe”
Hanif 和 Zaman - 2017 - Thiolation of arabinoxylan and its application in DOI: 10.1186/s40199-017-0172-2 -
confidence 1.0
“Peaks related to boron at 620, 1282, and 1330 cm-1 1530 cm-1”
Jagannadham 等 - 2007 - Neutron transmutation of B-10 doped diamond DOI: 10.1016/j.diamond.2006.03.019 -
Ring structure confidence 1.0
“ring peaks were present at 1530 and 1508.8 In the benzaldehyde-urea Schiff cm-1, base (BU), the >C=Nfunctionality was present at 1613 whereas its corresponding”
Synthesis, Characterization, Theoretical and Experimental Anticancer Evaluation of Novel Cocrystals of 5-Fluorouracil and Schiff Bases against SW480 Colorectal Carcinoma DOI: 10.3390/pharmaceutics15071929 -
Protein confidence 1.0
“Fourier transform-infrared spectroscopy (FTIR) analysis was used to determine the change in important, organic functional groups and highlighted cm-1 the disappearance of a peak at 1530 corresponding to the primary protein (C-N) and the app”
Khoironi 等 - 2023 - Impact of disposable mask microplastics pollution DOI: 10.1007/s11356-023-27651-5 -
C=n confidence 1.0
“LLM confirmed rule peak-group candidate”
Noda - 2013 - Formation of C-N-Si Film for Interlayer of Hard Ma DOI: 10.1088/1742-6596/417/1/012045 -
C c single bond confidence 1.0
“The absorption bands at 1530 and 1410 correspond to the C-C and C-H ◦C) stretching aromatic ring of the pMDI, respectively.”
Effects of NCO/OH Ratios on Bio-Based Polyurethane Film Properties Made from Acacia mangium Liquefied Wood DOI: 10.3390/polym15051154 -
confidence 1.0
“The amine functional absorption wave number of the carboxylic acid may be group in the chemical structure of the intact drug molecule due to adjacent amine change and subsequent reduced was identified by N-H absorption peaks at (strong 1530”
Siahi 等 - 2018 - Analytical Investigation of the Possible Chemical DOI: 10.15171/apb.2018.074
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