What absorbs at 1201 cm⁻¹ in an FTIR spectrum?
A band near 1201 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 1201 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 |
|---|---|---|---|
| Methacrylate | 2 | 2 | 1,0 |
| Amide | 2 | 2 | 1,0 |
| Acetate | 2 | 2 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 0,9 |
Rangering afspejler akkumulerede litteraturbeviser, ikke en enkelt autoritativ regel. Bekræft altid mod din prøvekontekst.
Mulige materialer
| Materiale | Understøttende toppe | Overlappende grupper | Citerede kilder |
|---|---|---|---|
| polyamide | 1201, 1663, 1541 | Amide, Methacrylate, Acetate | 1 |
| polypyrrole | 1201, 1700, 400 | Amide, Methacrylate, Acetate | 1 |
| TiO | 1201, 1730, 1699 | Methacrylate, Acetate | 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 1201 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
-
Ring structure tillid 1,0
“cm-1 (asymmetric C=O stretching vibration of carboxylate), 1555 (Py ring stretching cm-1 cm-1 vibration), 1476 (Py ring stretching and C-H in-plane stretching vibration), 1319 cm-1 cm-1 (C-N in-plane deformation), 1201 (Py ring vibration),”
New conductive copolymer membranes via track-etched PC templates for biological media ultra-filtration DOI: 10.1016/j.nimb.2007.08.066 -
Acetate tillid 1,0
“The absorption-free regions of the NWF-PP ATR-FTIR spectrum of samples treated with cloves buds extract allow the clear identification of the characteristic signals of polywithclovesbudsextractallowtheclearidentificationofthecharacteristics”
Cicogna 等 - 2022 - Surface Functionalization of Face Masks with Cold DOI: 10.3390/molecules27238632 -
C c single bond tillid 1,0
“The difference spectra have negative bands at 1201 and 1169 arise from C-C stretching been scaled to match the intensity of the amide II bands vibrations of the retinal in ground state bR.”
Time-Resolved Microspectroscopy on a Single Crystal of Bacteriorhodopsin Reveals Lattice-Induced Differences in the Photocycle Kinetics DOI: 10.1529/biophysj.106.083345 -
Hydroxyl (O-H) tillid 1,0
“2 1200, 1208 1201 cm-1) O-H deformation (1208 hemicelluloses [45] C=O stretching vibrations in lignin, acetyl and carboxyl vibrations in xylans [44] 1222, 1230, 1233, 1234 1230-1236”
Study of Interactions between Titanium Dioxide Coating and Wood Cell Wall Ultrastructure DOI: 10.3390/nano12152678 -
Alkyl C-H tillid 0,9
“Explicit assignment: fanning vibration of CH group.”
Influence of Cross-Linking Agent Concentration/Beta Radiation Surface Modification on the Micro-Mechanical Properties of Polyamide 6 DOI: 10.3390/ma14216407
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