What absorbs at 3105 cm⁻¹ in an FTIR spectrum?
A band near 3105 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 3105 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 |
|---|---|---|---|
| Alkyl C-H | 2 | 2 | 1,0 |
| Sulfur heterocycle | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Nitrogen heterocycle | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 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 |
|---|---|---|---|
| ionic liquids | 3105, 938, 1040 | Alkyl C-H, Ring structure | 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 3105 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
-
C c single bond tillid 1,0
“al.29 band at 3105 reported by Pace et who assigned it as the combination band of the C-C 47 48 cm-1) cm-1).”
Blue-Shifted Hydrogen Bonding in the Gas Phase CH/D3CN●●●HCCl3 Complexes DOI: 10.1021/acs.jpca.8b12200 -
tillid 1,0
“Cell Component Peak Maxima Molecular Vibration Chitin/chitosan 3261 N-H stretching 3105”
Metal and Phosphate Ions Show Remarkable Influence on the Biomass Production and Lipid Accumulation in Oleaginous Mucor circinelloides DOI: 10.3390/jof6040260 -
Alkyl C-H tillid 1,0
“On the other hand, SR-g-VIM showed a peak at 3105 due to the cm-1 stretching vibration of C-H from the imidazole ring, a signal at 1657 assigned to the stretching cm-1 vibration of aromatic C=C, bands, peaks at 1495 and 1416 corresponding t”
Obando-Mora 等 - 2015 - Synthesis of a pHand ThermoResponsive Binary C DOI: 10.3390/coatings5040758 -
Alkyl C-H tillid 1,0
“There cm-1 was an intense band at 3300 assigned to NH stretching vibrations of urea moieties, cm-1 cm-1 and several weak bands at ~3105 (=CH stretching in thiophene ring), ~3045”
Voltammetric Detection of Vanillylmandelic Acid and Homovanillic Acid Using Urea-Derivative-Modified Graphite Electrode DOI: 10.3390/s23073727 -
tillid 0,8
“Text: 'peak at 3105 cm-1 and some wavenumber shifts for various mode'”
Moumene 等 - 2014 - Vibrational spectroscopic study of ionic liquids DOI: 10.1016/j.molstruc.2014.02.034
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