What absorbs at 1172 cm⁻¹ in an FTIR spectrum?
A band near 1172 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 1172 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 | 8 | 8 | 1,0 |
| Acetate | 8 | 8 | 1,0 |
| Methoxy (OCH3) | 6 | 6 | 1,0 |
| C-O single bond | 6 | 6 | 1,0 |
| Alkyl C-H | 5 | 5 | 1,0 |
| Ketone | 3 | 3 | 1,0 |
| Ester | 3 | 3 | 1,0 |
| Carboxyl (COOH) | 3 | 3 | 1,0 |
| Amide | 3 | 3 | 1,0 |
| Carbonyl (C=O) | 3 | 3 | 1,0 |
| N h | 2 | 2 | 1,0 |
| Ring structure | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| N-O bond | 1 | 1 | 1,0 |
| S eq o | 1 | 1 | 0,8 |
| C-S single bond | 1 | 1 | 0,8 |
Rangering afspejler akkumulerede litteraturbeviser, ikke en enkelt autoritativ regel. Bekræft altid mod din prøvekontekst.
Mulige materialer
| Materiale | Understøttende toppe | Overlappende grupper | Citerede kilder |
|---|---|---|---|
| lipids | 1172, 1735, 810 | Methacrylate, Acetate, 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 1172 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
-
N-O bond tillid 1,0
“In IR and 990, 1172 and 1170 cm-1 Raman spectra, rocking vibrations of NO are observed at 545 and 548 respectively while out of plane”
Dalal 等 - 2015 - Structural, electrical, ferroelectric and mechanic DOI: 10.1039/C5RA10501C. -
Acetate tillid 1,0
“The peaks at 1172 cm-1 and 1240 cm-1 denote the C-O stretching bands of the ester functional group.”
Jumaah 等 - 2021 - Optimization for esterification of saturated palm DOI: 10.3906/kim-2103-11 -
Acetate tillid 1,0
“In the spectrum of the leaf part of the plant,1st peak (3372.57 cm-1) belongs to OH group in the group of (COOH), 2nd peak (2916.72-2848.93 cm-1, doublet) belongs to the group of NH 2, 3rd peak (1734.36 cm-1) belongs to C=O group in the gro”
Tasci 等 - 2016 - Determination of alliin and allicin in the plant o DOI: 10.17660/ActaHortic.2016.1143.19 -
Alkyl C-H tillid 1,0
“1646 C-H stretch Amide I 1734 C=O stretch 1468 C-H bend 1734 1468 1467 C-H bend 1090 PO2 stretch C = O stretch C-H bend 1172”
Prediction of Neonatal Respiratory Distress Biomarker Concentration by Application of Machine Learning to Mid-Infrared Spectra DOI: 10.3390/s22051744 -
Alkyl C-H tillid 1,0
“The weak bands at 1284, 1264, cm(cid:2)1can and 1228 be attributed to the CH wagging, followed by a band at 1172 2 cm(cid:2)1, which is related to the ring deformation.”
Synthesis, crystal structure, and characterization of cyclohexylammonium tetraisothiocyanatocobaltate(II): A single-source precursor for cobalt sulfide and oxide nanostructures DOI: 10.1016/j.heliyon.2019. -
Acetate tillid 1,0
“The IR spectra (b) of loaded nanoparticles potentially overcome physiological barriers, and carry the clearly indicate the presence of HEMA as evident from the drug to specific cells or intracellular compartments by pascm-1 cm-1 (C=O stretc”
Chouhan 和 Bajpai - 2009 - Real time in vitro studies of doxorubicin release DOI: 10.1186/1477-3155-7-5 -
Acetate tillid 1,0
“tujafilina Figure 1 shows FTIR spectrum of with marked peaks corresponding to: cm-1), C-O stretching vibrations of glucose (1018 C-O and C-C stretching vibrations or C-Ocm-1), H, C-O-C deformation of carbohydrates (1172 CH3 deformation vibr”
Changes in Chemical Composition and Accumulation of Cryoprotectants as the Adaptation of Anholocyclic Aphid Cinara tujafilina to Overwintering DOI: 10.3390/ijms22020511 -
Acetate tillid 1,0
“The most intense bands at 1032, 1083, and 1172 cm-1 correspond to the valence vibrations of C-O-C, C-H, and C-O-H groups, respectively.”
The Solubility Studies and the Complexation Mechanism Investigations of Biologically Active Spiro[cyclopropane-1,3'-oxindoles] with -Cyclodextrins DOI: 10.3390/pharmaceutics15010228
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