What absorbs at 861 cm⁻¹ in an FTIR spectrum?
A band near 861 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
Ateb cyflym
A band near 861 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 |
|---|---|---|---|
| Alkyl C-H | 4 | 4 | 1.0 |
| Amide | 3 | 3 | 1.0 |
| Methacrylate | 3 | 3 | 1.0 |
| Acetate | 3 | 3 | 1.0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1.0 |
| Ketone | 2 | 2 | 1.0 |
| Ester | 2 | 2 | 1.0 |
| Carboxyl (COOH) | 2 | 2 | 1.0 |
| Carbonyl (C=O) | 2 | 2 | 1.0 |
| Methoxy (OCH3) | 2 | 2 | 1.0 |
| C-O single bond | 2 | 2 | 1.0 |
| Aromatic ring | 2 | 2 | 1.0 |
| Secondary amine | 2 | 2 | 1.0 |
| C n single bond | 2 | 2 | 1.0 |
| Hydroxyl (O-H) | 2 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| N-O bond | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Metal oxygen | 1 | 0 | 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 |
|---|---|---|---|
| starch | 861, 1650, 1540 | Methacrylate, Acetate, Alkyl C-H | 1 |
| humic acid | 861, 1660, 1220 | Alkyl C-H, Methacrylate, Acetate | 1 |
| PE | 861, 1414, 1700 | Alkyl C-H, Methacrylate, Acetate | 1 |
| PP | 861, 1700, 1043 | Alkyl C-H, Methacrylate, Acetate | 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 861 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
-
Acetate hyder 1.0
“The bands at about cm-1 cm-1 ∼1033 ∼1082 and are assigned to the coupling bands of the skeletal vibrational modes of cm-1 cm-1 ∼861 ∼881 C-O and C-C stretching vibration modes.”
Guo 等 - 2018 - Observation of conformational changes in ethylene DOI: 10.1063/1.4995975 -
Alkyl C-H hyder 1.0
“Moreover, the absorption weak absorption band at 861.22 was assigned to C-H bending of aromatic compounds.”
Facile Green Synthesis of Zinc Oxide Nanoparticles with Potential Synergistic Activity with Common Antifungal Agents against Multidrug-Resistant Candidal Strains DOI: 10.3390/cryst12060774 -
Alkyl C-H hyder 1.0
“Further bands at 861, 1261 and 1413 were assigned to CH vibra3”
Optical photothermal infrared spectroscopy with simultaneously acquired Raman spectroscopy for two-dimensional microplastic identification DOI: 10.1038/s41598-022-23318-2 -
N h hyder 1.0
“The other common overlapping ranges included 1712 (for water [31]), 1530 cm-1-1560 cm-1 (for coupled NH deformation and C-N stretching [32]), and near 861 cm-1”
Variety Identification of Orchids Using Fourier Transform Infrared Spectroscopy Combined with Stacked Sparse Auto-Encoder DOI: 10.3390/molecules24132506 -
Amide hyder 1.0
“-NHbond vibration peaks are at 1453 cm-1 (in-plane bending) and 861 cm-1 (out-of-plane cm-1 is the stretching vibration peak of the C-N bond and 1050 is the stretching vibration peak of the”
Inhibition of Poly(ethylenediaminetetraacetic acid-diethanolamine) on Deposition of Calcium Sulfate Crystal in Simulated Industrial Water DOI: 10.3390/cryst10060544 -
Aromatic ring hyder 1.0
“In addition to aromatic C-H bending, cm-1 protein and subsequently caused aggregation between unfoldthe peak at 861 may also indicate the presence of an ed proteins or dissociated low MW subunits via hydrophobic indolering, possibly by the”
Effect of maleylation on physicochemical and functional properties of rapeseed protein isolate DOI: 10.1007/s13197-016-2197-9) -
Acetate hyder 1.0
“2, OH bond scissoring, molecule substitution Xylose, Amygdalin 1726.95, 1646.78, 929.23, skeletal stretch, C=O, C-O stretch 861.14, 763.13 b-cyclodextrin, a-cyclodextrin, Yellow Native 3390.46, 2930.19, 2150.35, CH OH, C=O stretch, OH bend,”
Influence of physical and chemical modifications on granule size frequency distribution, fourier transform infrared (FTIR) spectra and adsorption isotherms of starch from four yam (Dioscorea spp.) cultivars DOI: 10.1007/s13197-021-05200-7 -
N-O bond hyder 1.0
“TOC, a new peak at 861 is seen possibly due to can interact with one or more HA molecules N-O stretching.”
Saxena 和 Brighu - 2020 - Optimized coagulation of humic acid and mineral tu DOI: 10.2166/ws.2020.141
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.