What absorbs at 2140 cm⁻¹ in an FTIR spectrum?
A band near 2140 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 8 cited sources
Hurtigt svar
A band near 2140 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 |
|---|---|---|---|
| Hydroxyl (O-H) | 4 | 4 | 1,0 |
| Adsorbed carbon monoxide | 2 | 1 | 1,0 |
| C#c | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Silicon hydride | 1 | 1 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 0 | 1,0 |
| Nitrile | 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 |
|---|---|---|---|
| AgNPs | 2140, 1232, 1048 | Hydroxyl (O-H) | 1 |
| silver nanoparticles | 2140, 1636, 1631 | Hydroxyl (O-H) | 1 |
| zeolite | 2140, 1013, 1245 | Hydroxyl (O-H), Adsorbed carbon monoxide | 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 2140 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
-
Hydroxyl (O-H) tillid 1,0
“N-D identified that the stretching vibrations of the Schiff X-D most spectral changes in the stretching vibrations cm-1 (32) base in BR and ppR are located at 2171 and 2123 O-D N-D originate from either a water stretch or a stretch cm-1 and”
Ota 等 - 2006 - Structural changes in the Schiff base region of sq DOI: 10.1021/bi051937l -
Hydroxyl (O-H) tillid 1,0
“Physisorbed CO results in a band at 2140 cm-1, whereas CO interacting with surface OH groups gives rise to a band at 2155 while cm-1 cm-1 another massif from 2180 to 2245 accounts for CO interacting with Lewis cm-1”
Upgrading the PtCu intermetallic compounds: The role of Pt and Cu in the alloy DOI: 10.1016/j.cattod.2019.11.026 -
Silicon hydride tillid 1,0
“Whereas the decrease in the CH bands intensities and the simultaneous 3 cm-1 increase of the Si-H absorption band intensity at 2140 at higher W/F values (hard plasma conditions), is due to the higher monomer fragmentation.”
Comparative study of bulk and surface compositions of plasma polymerized organosilicon thin films DOI: 10.1002/ppap.201900024. -
Hydroxyl (O-H) tillid 1,0
“cm-1 and interaction with Here, the strong broadband centered at around 3291 and weak band at cm-1 around 2140 are ascribed to the inter molecular hydrogen bonded network formed by the hydroxyl groups”
Bioinspired 5-caffeoylquinic acid capped silver nanoparticles using Coffee arabica leaf extract for high-sensitive cysteine detection DOI: 10.1038/s41598-023-34944-9 -
tillid 1,0
“Based on our previous studies supported by DFT calculations [8,11], we assign the cm-1 2127 band to Pd(II)(OH)(CO) complex (or alternatively Pd(II)(CO) complex: we cannot cm-1 exclude either assignment at present) and the 2140 band to a dif”
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. -
C c single bond tillid 1,0
“LLM confirmed rule peak-group candidate”
Microsoft Word - Rapid_synthesis_of_nanocrystalline_YAG_via_microwave_assisted_solvothermal_process_final_resubmit_jbBV (1) DOI: 10.1111/jace.15815 -
Adsorbed carbon monoxide tillid 1,0
“cm-1, bands of carbon dioxide at 2317 and 3728 cm-1, the rotovibrational band due to CO deformation at bands of carbon dioxide at 2317 and 3728 the rotovibrational band due to CO deformation at 2 2 cm-1, cm-1), 771 the rotovibrational band”
Thermocatalytic Pyrolysis of Exhausted Arthrospira platensis Biomass after Protein or Lipid Recovery DOI: 10.3390/en13205246 -
C#c tillid 1,0
“Also, a small stretch at 2140 was found, which can be assigned to alkyne Apart cm-1 from this, a very sharp and intense peak was obtained at 1650 for C=O stretch representing α, β unsaturated cm-1 aldehydes and ketones.”
Comparative assessment of green and chemically synthesized glutathione capped silver nanoparticles for antioxidant, mosquito larvicidal and eco-toxicological activities DOI: 10.1038/s41598-023-35249-7
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