What absorbs at 731 cm⁻¹ in an FTIR spectrum?
A band near 731 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
Ateb cyflym
A band near 731 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.
Aseiniadau grŵp swyddogaethol posibl
| Grŵp swyddogaethol | Ffeithiau ategol | Ffynonellau a ddyfynnwyd | Hyder uchaf |
|---|---|---|---|
| Methoxy (OCH3) | 1 | 1 | 1.0 |
| Methacrylate | 1 | 1 | 1.0 |
| C-O single bond | 1 | 1 | 1.0 |
| Acetate | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Chlorine | 1 | 1 | 1.0 |
| Fluorine (C-F) | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
Mae＇r safle＇n adlewyrchu tystiolaeth llenyddiaeth gronnwyd, nid rheol awdurdodol sengl. Cadarnhewch bob amser yn erbyn eich cyd-destun sampl.
Deunyddiau posibl
| Deunydd | Copaon ategol | Grwpiau sy＇n gorgyffwrdd | Ffynonellau a ddyfynnwyd |
|---|---|---|---|
| ZnO | 731, 1400, 3430 | Acetate, Methacrylate, C-O single bond | 1 |
| ZnO nanoparticles | 731, 1219, 1726 | Methacrylate, Acetate, C-O single bond | 1 |
Mae deunyddiau＇n cael eu dangos dim ond pan fydd yr un gronfa lenyddiaeth yn cefnogi＇r band hwn ac o leiaf un brig nodweddiadol ychwanegol.
Rhesymeg sbectrwm
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 731 cm⁻¹ is usually not enough for material identification by itself.
Defnydd yn y byd go iawn
Mae＇r math hwn o ymholiad yn gyffredin mewn adnabod polymer, sgrinio plastig anhysbys, datrys problemau QC, dilysu deunydd wedi＇i ailgylchu, ac adolygiad o aseiniad copa wedi＇i gefnogi gan lenyddiaeth.
Camgymeriadau cyffredin
- Trin un band ynysig fel prawf o ddeunydd heb wirio o leiaf un neu ddau gopa cefnogol.
- Anwybyddu gorgyffwrdd: gall grwpiau swyddogaethol lluosog gyfrannu ger yr un rhif ton.
- Hepgor dilysu pan fo ychwanegion, cymysgeddau, ocsideiddio, neu halogiad yn gallu ystumio＇r sbectrwm.
Cyngor dilysu
Pan fo amwysedd yn parhau, dilyswch y rhagdybiaeth gyda DSC, GC-MS, neu TGA, yn enwedig ar gyfer cymysgeddau, samplau dirywiedig, a pholymerau llawn.
Llenyddiaeth y tu ôl i＇r aseiniadau hyn
-
Hydroxyl (O-H) hyder 1.0
“Unassociated hydroxyl peaks at 731 and 653 in Raman occurred in the compound”
Arjunan 等 - 2012 - Quantum chemical studies and vibrational analysis DOI: 10.1016/j.saa.2012.08.053 -
hyder 1.0
“cm-1 Peaks below 900 are not usually interpreted because they represent too complex a 6 cm-1 structural signature, but the presence of a sharp and strong peak at 731 can be assigned to the presence of stretching mode of C-F bonds [28].”
Algarra 等 - 2018 - Enhanced electrochemical response of carbon quantu DOI: 10.1016/j.talanta.2017.09.082 -
hyder 1.0
“chainsinparallelorperpendicularlytotheplaneofthechains[23].The 731cm-1 C-Cl peak at was found to emanate from the rocking of the (0%100%), targetingbothattheextremevaluesandalsotodetect,with bonds [56].”
Giannoukos 和 Salonitis - 2020 - Study of the mechanism of friction on functionally DOI: 10.1016/j.triboint.2019.105906 -
Water (H2O) hyder 1.0
“The peaks at 731 650 1388 cm-1 are due to vibrations of free water molecules.”
Investigation of morphological, structural and electronic transformation of PVDF and ZnO/rGO/PVDF hybrid membranes DOI: 10.1007/s11082-023-04663-6 -
Acetate hyder 1.0
“A intense band at about 1300-1000 dine-like structure (m2/g) BET surface area A 685 630 697 731 cm-1 corresponds to the stretching in C-O, C-O-C, O-H in Average pore width d (nm) 3.13 2.73 3.18 2.43 carboxylic acids, anhydrides, lactones, e”
Yang JiLiang 等 - 2013 - Effect of microstructure and surface chemistry in DOI: 10.1007/s11434-013-6040-7
Oes gennych sbectrwm gyda＇r band hwn?
Llwythwch eich sbectrwm FTIR i fyny a chael adroddiad dehongli llawn — aseiniadau brig gyda chyfeiriadau llenyddiaeth, cyfateb llyfrgell, a chadwyn dystiolaeth â gradd hyder — mewn eiliadau.