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
Risposta rapida
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.
Possibili assegnazioni di gruppi funzionali
| Gruppo funzionale | Fatti di supporto | Fonti citate | Affidabilità massima |
|---|---|---|---|
| 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 |
La classifica riflette le prove bibliografiche accumulate, non una singola regola autorevole. Conferma sempre nel contesto del tuo campione.
Materiali possibili
| Materiale | Picchi di supporto | Gruppi sovrapposti | Fonti citate |
|---|---|---|---|
| lipids | 1172, 1735, 810 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
I materiali vengono mostrati solo quando lo stesso pool di letteratura supporta questa banda e almeno un picco caratteristico aggiuntivo.
Logica dello spettro
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.
Utilizzo nel mondo reale
Questo tipo di richiesta è comune nell＇identificazione dei polimeri, nello screening di plastiche sconosciute, nella risoluzione dei problemi di controllo qualità, nella verifica dei materiali riciclati e nella revisione dell＇assegnazione dei picchi supportata dalla letteratura.
Errori comuni
- Trattare una banda isolata come prova di un materiale senza verificare almeno uno o due picchi di supporto.
- Ignorando la sovrapposizione: più gruppi funzionali possono contribuire vicino allo stesso numero d＇onda.
- Saltare la convalida quando additivi, miscele, ossidazione o contaminazione possono distorcere lo spettro.
Consiglio di verifica
Quando permangono ambiguità, convalida l＇ipotesi con DSC, GC-MS o TGA, specialmente per miscele, campioni degradati e polimeri caricati.
Letteratura dietro queste assegnazioni
-
N-O bond affidabilità 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 affidabilità 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 affidabilità 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 affidabilità 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 affidabilità 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 affidabilità 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 affidabilità 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 affidabilità 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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