What absorbs at 2245 cm⁻¹ in an FTIR spectrum?
A band near 2245 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 2245 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.
Möjliga identifieringar av funktionella grupper
| Funktionell grupp | Stödjande fakta | Citerade källor | Högsta förtroende |
|---|---|---|---|
| Secondary amine | 2 | 2 | 1,0 |
| Nitrile | 2 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Silicon hydride | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 0 | 1,0 |
Rankingen speglar ackumulerade litteraturbevis, inte en enda auktoritativ regel. Bekräfta alltid mot din provkontext.
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 2245 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.
Litteratur bakom dessa identifieringar
-
Silicon hydride förtroende 1,0
“the band of 1108 corresponding to Sicm-1 O-Si (asymmetric stretching of interstitial oxygen in Si) and absorption peaks at 882 and 2245 cm-1 corresponding to O 3-SiH bending and stretching mode [4, 6, 12, 18, 19, 32].”
REVERSIBLE QUENCHING OF PHOTOLUMINESCENCE IN STAIN ETCHED POROUS SILICON AT HNO3 POSTTREATMENT AND ROLE OF OXYGEN BONDS DOI: 10.1016/j.jlumin.2017.11.011 -
Amide förtroende 1,0
“R-NH 2, CO, CO 2 2307 C-N (stretching) and NCO (asymmetric stretching) R-CN, R-NCO 2245”
Hejna 等 - 2017 - Performance properties of rigid polyurethane-polyi DOI: 10.1515/epoly-2017-0012 -
Nitrile förtroende 1,0
“at 3286.70/cm (OH and NH stretching), 2245.14/cm (CN nitrile stretching), 1660.71/cm (C=O tertiary amide),”
Kausar 等 - 2021 - Formulation, In Vitro Evaluation, and Toxicity Stu DOI: 10.1155/2021/6634780 -
förtroende 0,9
“Stretching vibrations from AN at 2245 cm-1.”
Advanced hybrid membranes for efficient nickel retention from simulated wastewater DOI: 10.1002/pi.6183
Har du ett spektrum med detta band?
Ladda upp ditt FTIR-spektrum och få en fullständig tolkningsrapport – toppidentifieringar med litteraturhänvisningar, biblioteksmatchningar och en förtroendebedömd beviskedja – på sekunder.