What absorbs at 835 cm⁻¹ in an FTIR spectrum?
A band near 835 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 835 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 |
|---|---|---|---|
| Alkyl C-H | 5 | 4 | 1,0 |
| Alkene (C=C) | 4 | 3 | 1,0 |
| C-O single bond | 3 | 3 | 1,0 |
| Amide | 2 | 2 | 1,0 |
| Ring structure | 2 | 2 | 1,0 |
| Carbohydrate | 2 | 2 | 1,0 |
| Methoxy (OCH3) | 2 | 2 | 1,0 |
| Methacrylate | 2 | 2 | 1,0 |
| Acetate | 2 | 2 | 1,0 |
| Lignin | 2 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Silicon carbon | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Phosphorus | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 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 |
|---|---|---|---|
| PVA | 835, 1660, 2930 | Alkyl C-H, C-O single bond, Amide | 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 835 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
-
affidabilità 1,0
“Explicit assignment: IR absorption band at 835 cm-1 reported as result of π-π* interaction”
Influence of Single-Walled Carbon Nanotubes Enriched in Semiconducting and Metallic Tubes on the Electropolymerization of Tetrabromo Ortho-Xylene: Insights on the Synthesis Mechanism of Poly(ortho-phenylenevinylene) DOI: 10.1016/j.eurpolymj.2017.01.015 -
Alkene (C=C) affidabilità 1,0
“The C=C band of the cm-1 isoprene is shown at 835 [6,7] as a shoulder peak to the epoxide.”
Dahham 等 - 2018 - The Influences of Zirconium Dioxide on ENR-25ZrO2 DOI: 10.1088/1742-6596/1019/1/012055 -
Alkyl C-H affidabilità 1,0
“cm-1 bending vibrations of C-H are present at 835 and 860 in Raman spectra.”
Dalal 等 - 2015 - Structural, electrical, ferroelectric and mechanic DOI: 10.1039/C5RA10501C. -
C-O single bond affidabilità 1,0
“In addition, one of the cm-1that 3,200 represents the presence of N-H group chitin compound indication is the occurrence of tug cm-1reflecting on amide and the presence of peak at the wavelength vibration at the wavelength of 834.54 cm-1 of”
Naiu 等 - 2020 - The Effect of HCl-Thermal Pressure Hydrolysis and DOI: 10.12944/CRNFSJ.8.1.18 -
Acetate affidabilità 1,0
“cm(cid:3)1 (CH rockteristics of vibration peaks at 835 and 930 electrodes.22 2 It is also noticed that the semicircular portion cm(cid:3)1 cm(cid:3)1 (C-O-C stretching), 1220 and 1250 ing), 1116 is reduced and almost disappeared for plastic”
Influence of high and low dielectric constant plasticizers on the ion transport properties of PEO: NH4HF2 polymer electrolytes DOI: 10.1177/0954008319894043 -
C c single bond affidabilità 1,0
“While the bond C-C rocking noted for PVA 0.1g/ CMC 0.4g 835.00cm-1 only and IR peak corresponds to CMC polymer that acts 1, 4-β Glycoside of cellulose seemed only in (PVA 0.2g /CMC 0.3 g) and (PVA0.25 g / CMC0.25 g) and disappeared in the r”
Abead 等 - 2023 - Study physical characteristics of Polyvinyl Alcoho DOI: 10.15764/pche.2014.02001. -
Alkyl C-H affidabilità 1,0
“Peaks at 875 cm-1 and 835 cm-1 are attributed to C-H expansion outside the benzene ring, due to the hydroxymethyl synthesis reaction of formaldehyde and phenol.”
Chen 等 - 2020 - Properties of Wood Ceramics Prepared from Thermo-M DOI: 10.3390/f11111204 -
Phosphate (PO4) affidabilità 1,0
“Band Position (cm-1) No Band Assignments 1 780 Sugar phosphate vibration 2 835 Deoxyribose phosphate Adenine3 938 Thymine base pairs CCC and O of deoxyribose skeletal 4 963 motion PC5 1014 O or O stretching C6 1050 O deoxyribose stretching”
Chemical and Physical Characteristics of Doxorubicin Hydrochloride Drug-Doped Salmon DNA Thin Films DOI: 10.1038/srep12722
Hai uno spettro con questa banda?
Carica il tuo spettro FTIR e ottieni un report di interpretazione completo — assegnazioni di picchi con citazioni bibliografiche, corrispondenze con librerie e una catena di prove con valutazione di affidabilità — in secondi.