What absorbs at 1561 cm⁻¹ in an FTIR spectrum?
A band near 1561 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 1561 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.
Possibili assegnazioni di gruppi funzionali
| Gruppo funzionale | Fatti di supporto | Fonti citate | Affidabilità massima |
|---|---|---|---|
| N h | 5 | 4 | 1,0 |
| Carboxyl (COOH) | 4 | 4 | 1,0 |
| Amide | 4 | 4 | 1,0 |
| Hydrogen bond | 3 | 2 | 1,0 |
| Ester | 2 | 2 | 1,0 |
| Acetate | 2 | 2 | 1,0 |
| Oxygen heterocycle | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Amine primary | 1 | 1 | 1,0 |
| Lipid | 1 | 1 | 1,0 |
| Fatty acid | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
La classifica riflette le prove bibliografiche accumulate, non una singola regola autorevole. Conferma sempre nel contesto del tuo campione.
Possible materials
| Materiale | Picchi di supporto | Overlapping groups | Fonti citate |
|---|---|---|---|
| starch | 1561, 1650, 1540 | Amide | 1 |
| graphene | 1561, 1720, 2097 | Amide, Carboxyl (COOH) | 1 |
| CS | 1561, 1645, 1720 | Amide, Carboxyl (COOH) | 1 |
| CA | 1561, 1045, 1650 | Amide, Carboxyl (COOH) | 1 |
| polyaniline | 1561, 1565, 1570 | Amide | 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 1561 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.
Letteratura dietro queste assegnazioni
-
Hydroxyl (O-H) affidabilità 1,0
“Moreover, the new absorption peaks at 1372, 1508, 1561 cm-1 nium hydroxide (100 ml) was placed into a 250 ml round bottom and 1692 representing the C N stretching, C C stretching of flask, and then 4.0 g of tetraethoxyorthosilane (TEOS) was”
Stopband attenuation of silica spheres by attaching aniline and polyaniline DOI: 10.1016/j.synthmet.2013.03.007 -
Amide affidabilità 1,0
“110 × 100, = Index(CI%) (5) Crystallinity responsible for aliphatic CH stretching whereas the band 𝐼 1561cm-1 110 at was attributed to amide stretching of C=O.”
Anusha 和 Fleming - 2016 - Synthesis and Characterization of Chitosan Nanoagg DOI: 10.1155/2016/5379424 -
Alkene (C=C) affidabilità 1,0
“In the FTIR spectrum of rGO-TEPA, few representative peaks were identified at 1654, In the FTIR spectrum of rGO-TEPA, few representative peaks were identified at 1654, 1561, 1443, and 1186 cm-1, which can be attributed to the C=C stretching”
Cojocaru 等 - 2022 - Electrospun Nanofibrous Membranes Based on Citric DOI: 10.3390/polym14020294 -
N h affidabilità 1,0
“assigned the band at 1561 for aminopropyltrimethoxisilane SAM Chiang [32] deposited on silica gel to NH deformation modes with strong hydrogen bonding.”
Growth and organization of (3-Trimethoxysilylpropyl) diethylenetriamine within reactive amino-terminated self-assembled monolayer on silica DOI: 10.1016/S0079-6816(00)00024-1. -
affidabilità 1,0
“The most important element was the cm-1 increase in the intensity of peaks in the range of 3400-3200 wavenumbers, typical for cm-1, the presence of N-H bonds, and the increase in the absorption bands at 1561 and 1519 confirming the increase”
Optimization of Glutathione Adhesion Process to Modified Graphene Surfaces DOI: 10.3390/nano11030756 -
Ester affidabilità 1,0
“ν(C=O) A (at 1561 and 1410 The ester band in curve (split into two components, cm-1) at 1737 and 1728 is also very weak.”
Fourier Transform Infrared (FTIR) Spectroscopic Analyses of Microbiological Samples and Biogenic Selenium Nanoparticles of Microbial Origin: Sample Preparation Effects DOI: 10.3390/molecules -
Amide affidabilità 1,0
“The remarkable findings of this cm-1 cm-1 band at 1638 - 1561 amide II band at 1561 and study have been proven to be practically important in the cm-1.”
Koutb 等 - 2021 - Paclitaxel production by endophytic fungus, Neopes DOI: 10.30955/gnj.003839 -
Amide affidabilità 1,0
“spectrumsindicatehigherphospholipidcontent.Intheinterval Typical gluten bands are Amide I (80 % C-O stretch, 10 % cm-1 cm-1, 3100-2750 C-N stretch) at 1654 Amide II (60 % N-H bend, 30 % bands originating from stretch vibrations of C-Nstretc”
Pourfarzad 等 - 2015 - Serish inulin and wheat biopolymers interactions i DOI: 10.1007/s13197-015-1939-4
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