What absorbs at 1880 cm⁻¹ in an FTIR spectrum?
A band near 1880 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 7 cited sources
Quick answer
A band near 1880 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.
Возможные назначения функциональных групп
| Функциональная группа | Подтверждающие факты | Цитируемые источники | Максимальная достоверность |
|---|---|---|---|
| Methacrylate | 2 | 2 | 1,0 |
| Carboxyl (COOH) | 2 | 2 | 1,0 |
| Acetate | 2 | 2 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| N-O bond | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 0,9 |
Ранжирование отражает накопленные литературные данные, а не единственное авторитетное правило. Всегда проверяйте в контексте вашего образца.
Possible materials
| Материал | Поддерживающие пики | Overlapping groups | Цитируемые источники |
|---|---|---|---|
| CuO | 1880, 453, 1000 | Methacrylate, Acetate, Carboxyl (COOH) | 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 1880 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.
Литература, лежащая в основе этих назначений
-
Carboxyl (COOH) достоверность 1,0
“These include changes in the 2O of a broad band around 1880 due to free ance in D cm-1 carboxylic acid region (see below), negative bands 1750 DCN (23).”
Rich 和 Breton - 2001 - FTIR studies of the CO and cyanide adducts of full DOI: 10.1021/bi0027332 -
Acetate достоверность 1,0
“FTIR spectral peaks (1087 demonstrate the existence of bands associated with cm-1), cm-1), amide N-H stretching (3444 alkane C-H stretching (2926 anhydride C=O cm-1), bending (1880 and C-O stretch [39].”
Phytoconstituents Assisted Biofabrication of Copper Oxide Nanoparticles and Their Antiplasmodial, and Antilarval Efficacy: A Novel Approach for the Control of Parasites DOI: 10.3390/molecules27238269 -
достоверность 1,0
“cm-1 the presence of CO, whereas the ~1880 and ~1863 bands lose a large fraction of their intensities due to the formation of Pd(II)(CO)(NO) mixed ligand complex upon exposure to CO.”
The superior hydrothermal stability of Pd/SSZ-39 in low temperature passive NOx adsorption (PNA) and methane combustion DOI: 10.1016/j.jcat.2010.07.031. -
Acetate достоверность 1,0
“cm-1 The band located at 1880 is assigned to C=O stretching vibration, while the bands of cm-1 cm-1 1500 and respectively 1360 correspond to C-O vibration.”
LA‐H‐Zeolites Efficient Catalysts For Acetic Acid Ketonic Decarboxylation and Esterification DOI: 10.1002/jctb.6732 -
Alkyl C-H достоверность 1,0
“cm-1 The absorption band at 1880 is off-plane due to the C-H deformation.”
Naseriyeh 等 - 2022 - Preparation of liposomal hydrogel containing Calen DOI: 10.14715/cmb/2022.68.11.1 -
Aromatic ring достоверность 0,9
“Explicit assignment.”
Sedimentology and Paleodepositional Environment of the Early-Middle Miocene Tanjong Formation, Southeast Sabah: Evidence from Bulk Geochemistry and Palynology Analyses DOI: 10.3390/min13040494 -
достоверность 0,8
“Text: 'peak at 1880 cm-1' and 'Ge-H bulk band gaps'”
Soukup 等 - 2004 - Deposition of high quality amorphous silicon, germ DOI: 10.1016/j.surfcoat.2003.08.006
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