What absorbs at 2190 cm⁻¹ in an FTIR spectrum?
A band near 2190 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 5 cited sources
Hurtigt svar
A band near 2190 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.
Mulige funktionelle gruppetildelinger
| Funktionel gruppe | Understøttende fakta | Citerede kilder | Højeste tillid |
|---|---|---|---|
| Carbonyl (C=O) | 2 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Adsorbed carbon monoxide | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Nitrile | 1 | 1 | 0,9 |
| Hydroxyl (O-H) | 1 | 0 | 1,0 |
Rangering afspejler akkumulerede litteraturbeviser, ikke en enkelt autoritativ regel. Bekræft altid mod din prøvekontekst.
Mulige materialer
| Materiale | Understøttende toppe | Overlappende grupper | Citerede kilder |
|---|---|---|---|
| SiO2 | 2190, 1739, 699 | Methoxy (OCH3) | 1 |
Materialer vises kun, når den samme litteraturpulje understøtter dette bånd og mindst en yderligere karakteristisk top.
Spektrumlogik
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 2190 cm⁻¹ is usually not enough for material identification by itself.
Anvendelse i virkeligheden
Denne type forespørgsel er almindelig ved polymeridentifikation, screening af ukendt plast, fejlfinding i kvalitetskontrol, verifikation af genanvendt materiale og litteraturunderstøttet gennemgang af peak-tildeling.
Almindelige fejl
- Behandling af et isoleret bånd som bevis på et materiale uden at kontrollere mindst en eller to understøttende toppe.
- Ignorerer overlap: flere funktionelle grupper kan bidrage nær samme bølgetal.
- Spring validering over, når additiver, blandinger, oxidation eller forurening kan forvrænge spektret.
Verifikationsrådgivning
Når tvetydighed fortsat består, valider hypotesen med DSC, GC-MS eller TGA, især for blandinger, nedbrudte prøver og fyldte polymerer.
Litteratur bag disse tildelinger
-
Silicon (Si) tillid 1,0
“0.86 - Dab Cs wag 757 0.75 - Hbc Si stretch 2190 (2214.7)”
Gibbons 等 - 2013 - Huge isotope effect on the vibrational lifetimes o DOI: 10.1103/PhysRevB.87.115207 -
Carbonyl (C=O) tillid 1,0
“cm-1, cm-1, cm-1, 2355 CO band at 2190 carbonyl band at 1749 water band at 3565 cm-1, cm-1.”
Marcilla 等 - 2018 - TGA-FTIR study of the pyrolysis of sodium citrate DOI: 10.1002/jsfa.9121 -
Adsorbed carbon monoxide tillid 1,0
“The band position at 2190 cm-1 agrees with the assignment to CO adsorbed on Al3+ Absorption, 2”
CuO-Fe2O3 Nanoparticles Supported on SiO2 and Al2O3 for Selective Hydrogenation of 2-Methyl-3-Butyn-2-ol DOI: 10.3390/catal11050625 -
Amide tillid 1,0
“(cid:4)C, (C(cid:3)N), (C¼C), 222-224 Rf: 0.56 (Acetone: nstretch), 2190.48 1635.90 2889.92, 2858.39 (CH3 Off white solid, Yield: 87%, m.p: cm(cid:2)1): (C¼C), (C-N), (C-O), 3811.32, 3459.81, 3378.02, bend), 1413.79 1179.69 1030.04 hexane (”
7-Hydroxy-4-phenyl-1, 2-dihydroquinoline derivatives: synthesis via one-pot, three-component reaction and structure elucidation DOI: 10.1016/j.heliyon.2020.e05035 -
tillid 0,9
“Peaks at 2185-2190 and 2164 attributed to Ni2+-CO.”
Surface Spectroscopy on UHV-Grown and Technological Ni–ZrO2 Reforming Catalysts: From UHV to Operando Conditions DOI: 10.1007/s11244-016-0678-8
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