What absorbs at 2103 cm⁻¹ in an FTIR spectrum?
A band near 2103 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 4 cited sources
Quick answer
A band near 2103 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 |
|---|---|---|---|
| C#c | 2 | 2 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Adsorbed carbon monoxide | 1 | 0 | 1,0 |
| Metal oxygen | 1 | 0 | 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 |
|---|---|---|---|
| Polyethylene | 2103, 1737, 1720 | Alkyl C-H | 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 2103 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
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affidabilità 1,0
“= 0.25 kJ/mol) (θ ML) is very close (170 amount of CO on O-Pt(111) gives an IR band at 2107 Pt(111) surface O kJ/mol) to that on a clean Pt(111) surface (177 at the same ascribed to a L CO species on terrace sites interacting with cm-1 spec”
Bourane 和 Bianchi - 2003 - Oxidation of CO on a PtA1(2)O(3) catalyst from t DOI: 10.1016/S0021-9517(03)00267-7 -
C#c affidabilità 1,0
“explicit assignment”
Fabrication of Hypericin Imprinted Polymer Nanospheres via Thiol-Yne Click Reaction DOI: 10.3390/polym9100469 -
C#c affidabilità 1,0
“It can be seen that, neither characteristic The shell of magnetic nanospheres was analyzed by FTIR spectroscopy to verify the thiol-yne click (C≡C (C≡C absorptions at 2103 and 3274 cm-1 and C-H in alkynyl groups) on monomer 1 [29], nor abso”
Fabrication of Core-Shell Magnetic Molecularly Imprinted Nanospheres towards Hypericin via Click Polymerization DOI: 10.3390/polym11020313 -
affidabilità 0,9
“Assigned to higher ion per literature [13,14].”
Zhang 等 - 2003 - FT-IR investigations of ion association in PEO-MSC DOI: 10.1016/j.ssi.2003.08.051
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