What absorbs at 1156 cm⁻¹ in an FTIR spectrum?
A band near 1156 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 1156 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 |
|---|---|---|---|
| C-O single bond | 19 | 19 | 1,0 |
| Methoxy (OCH3) | 16 | 16 | 1,0 |
| Methacrylate | 16 | 16 | 1,0 |
| Acetate | 16 | 16 | 1,0 |
| Carbohydrate | 9 | 9 | 1,0 |
| Alkyl C-H | 5 | 5 | 1,0 |
| Hydroxyl (O-H) | 5 | 5 | 1,0 |
| C c single bond | 3 | 3 | 1,0 |
| Ring structure | 2 | 2 | 1,0 |
| Amide | 2 | 2 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Fluorine (C-F) | 1 | 1 | 1,0 |
| Ammonium | 1 | 1 | 1,0 |
| Oxygen heterocycle | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| C-S single bond | 1 | 1 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
| S eq o | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
| Adsorbed carbon monoxide | 1 | 1 | 0,9 |
| Ester | 1 | 1 | 0,7 |
| Carboxyl (COOH) | 1 | 0 | 1,0 |
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 |
|---|---|---|---|
| cellulose | 1156, 1735, 1650 | Acetate, Methacrylate, C-O single bond | 1 |
| PPy | 1156, 1043, 910 | Methoxy (OCH3), Methacrylate, C-O single bond | 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 1156 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
-
Acetate affidabilità 1,0
“0.14 0.01** Amide II 1542.34±1.54 1545.34±0.46 0.05* COO symmetric stretching 1396.38±2.09 1398.45±1.27 0.01** PO2 asymmetric stretching 1235.51±1.74 1250.20±0.57 0.01** C-O-C symmetric stretching 1156.29±1.22 1150.96±1.48 PO2 symmetric str”
Use of Fourier transform infrared spectroscopy for rapid comparative analysis of Bacillus and Micrococcus isolates DOI: 10.1016/j.foodchem.2008.08.063 -
Amide affidabilità 1,0
“The presence of mode at were also sheep), the band of the amide III at 1156cm(cid:3)1, unclear to the researchers until they were appointed to a confirming the stabilshifted to wave number at amide's 100(cid:1) side chain (resonance of amin”
Hassan - 2019 - Fourier transform infrared spectroscopy to detect DOI: 10.1080/00387010.2019.1623262 -
Water (H2O) affidabilità 1,0
“33O+ in Figure 3 is assigned to the absorption at 2366 similarly the quantity of RSO and H in equilibrium with combination of CF stretching vibrations at 1156 and 1212 that (C 0) of RSO 3H at the stage II when free water just cm-1.12 cm-1 T”
Iwamoto 等 - 2002 - Water in perfluorinated, sulfonic acid Nafion memb DOI: 10.1021/jp013709g -
Carbohydrate affidabilità 1,0
“The characteristic bands of β-glucan are at 1156, 1076, 889cm-1.”
Liu 等 - 2006 - A study of the mushrooms of boletes by Fourier tra DOI: 10.1117/12.667136 -
Carbohydrate affidabilità 1,0
“In the entire 1D-FTIR spectra, sixteen peaks herbs contain considerably quantity of starch which was were chosen as characteristic peaks and summarized in revealed from the characteristic peaks at 1156-”
Lu 等 - 2008 - Differentiation of Asian ginseng, American ginseng DOI: 10.1016/j.molstruc.2007.12.008 -
Acetate affidabilità 1,0
“5, the TSX spectra showed a C-O-C band at 1156 and a cm-1 small broad peak at 1119 assigned to the C-OH as previously described [35].”
Sangfai 等 - 2015 - Preparation and characterization of kappa-carragee DOI: 10.1007/s00289-015-1360-1 -
Silicon (Si) affidabilità 1,0
“The peaks in zeolite (1156 24.0 with 4.35 Å and 3.70 Å d-spacing values were associated with the cm(cid:0) 1) Si-O-Si 1054 could be because of stretching in bonds and charinterplanar spacing of PPy (Janaki et al., 2015;”
Polypyrrole/zeolite composite – A nanoadsorbent for reactive dyes removal from synthetic solution DOI: 10.1016/j.chemosphere.2021.132164 -
S eq o affidabilità 1,0
“These new assignments at 1186 & 1011 cm-1 corresponded to -SO 3Na group while the bands in 1156 & 1149 region are due to S=O stretching 138 vibration.”
Radiation synthesis and characterization of super-absorbing hydrogel from natural polymers and vinyl monomer DOI: 10.1016/j.envpol.2018.07.129
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