What absorbs at 2186 cm⁻¹ in an FTIR spectrum?
A band near 2186 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
Hurtigt svar
A band near 2186 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 |
|---|---|---|---|
| Adsorbed carbon monoxide | 2 | 2 | 1,0 |
| Silicon hydride | 2 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
Rangering afspejler akkumulerede litteraturbeviser, ikke en enkelt autoritativ regel. Bekræft altid mod din prøvekontekst.
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 2186 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
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Silicon hydride tillid 1,0
“Then, to determine 2186cm-1 907cm-1 and at the due to SiH asymmetric the concentration in the plasma, three other independent 4 bending [15].”
Fourier-transformed infrared absorption spectroscopy: a tool to characterize the chemical composition of Ar--NH3--SiH4 dielectric barrier discharge DOI: 10.1088/0022-3727/46/46/464007 -
Hydroxyl (O-H) tillid 1,0
“on shoulder at 2144 bands at 2150 and 2155 which areslightly up-shifted, can and a small band at 2186 Upon 2013 cm(cid:2)1, be attributed to CO hydrogen-bonded to OH groups of different evacuation, the band at 2144 which is very close to th”
Farra 等 - 2013 - Understanding CeO2 as a Deacon catalyst by probe m DOI: 10.1039/C2CP42767B -
Adsorbed carbon monoxide tillid 1,0
“7 showed bands typical of carbon max cm-1, dioxide (at 2359-2310 attributed to asymmetric stretching vibration and at cm-1 669 attributed to the degenerate bending vibration), carbon monoxide (at cm-1 *2186 and 2114 related to stretching vi”
Transparent sulfur-containing thermoplastic polyurethanes with polyether and polycarbonate soft segments DOI: 10.1007/s00289-017-2088-x -
Adsorbed carbon monoxide tillid 1,0
“7 3D plots of FTIR spectra of volatile products obtained during cm-1, 916 connected with C-H out-of-plane deformation the thermal decomposition of the RPURs H and HM vibration of vinyl group) and carbon monoxide (at cm-1, *2186 attributed t”
Aliphatic polycarbonate-based thermoplastic polyurethane elastomers containing diphenyl sulfide units DOI: 10.1007/s10973-016-5420-z
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