What absorbs at 657 cm⁻¹ in an FTIR spectrum?
A band near 657 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 657 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 |
|---|---|---|---|
| Metal oxygen | 3 | 3 | 1.0 |
| Ring structure | 2 | 2 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| Nitrogen heterocycle | 1 | 1 | 1.0 |
| Alkene (C=C) | 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 |
|---|---|---|---|
| TiO2 | 657, 1700, 1093 | Metal oxygen | 1 |
| TiO | 657, 1730, 1699 | Metal oxygen | 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 657 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
-
hyder 1.0
“The Raman peaks observed at 483 are attributed to the stretching mode vibration of Mn-O bonds, and another peak observed at cm-1 657 corresponds to A1g mode vibration of Mn 3O 4.”
Synthesis and characterization of Mn3O4/MnSnO3 nanocomposites for supercapacitor applications DOI: 10.1007/s12588-019-09250-7 -
Alkene (C=C) hyder 1.0
“The FTIR spectrum showed peaks at 1,592, 1,627 and 1,657 cm-1 assigned to C=C stretching of the imidazole ring and characteristic peaks at 1,605 and 1,766 assigned to C=O stretching.”
Synthesis, Characterization and Reactivity Ratio Study of Poly(di(tri-n-butyltin) citraconate-co-N-vinylimidazole) DOI: 10.3390/molecules15074750 -
hyder 1.0
“For this same 31, 39, and 46), thus exposing underneath layers, corresamples (showing a gypsum rich content) strong peaks late with the FTIR analysis of the samples, which indiascribed to lead white as well as a sharp peaks around cm-1 cate”
Cortea 等 - 2020 - Uncovering hidden jewels an investigation of the DOI: 10.1186/s40494-020-00401-3 -
Ring structure hyder 1.0
“The peaks cm-1 cm-1 occurring at 657 and 554 can be associated with the out of plane vibrations of ring structure and C-”
Okeke 等 - 2018 - Characterization of hibiscus sabdariffa fiber as p DOI: 10.1590/S1517-707620180004.0550 -
hyder 1.0
“Previous researchers have demonstrated that the peak around 657 is attributed 2 cm-1 to Ti-O-Ti stretching vibration, whereas the peak around 590 is due to the vibration of Ti-O-O.”
Physicochemical and Rheological Properties of a Transparent Asphalt Binder Modified with Nano-TiO2 DOI: 10.3390/nano10112152 -
Amide hyder 1.0
“cm-1 Other bands at 657.1 and 611.8 indicated an O=C-N bend of aliphatic secondary cm-1 amides [38].”
Adsorptive Performance of Walnut Shells Modified with Urea and Surfactant for Cationic Dye Removal DOI: 10.3390/w15081536 -
hyder 1.0
“In addition, the intense bands seen at 756 657 cm-1 and 489 ascribed to the Ti-O stretching vibration and confirmed the existence of TiO nanoparticles.”
UV-shielding properties of a cost-effective hybrid PMMA-based thin film coatings using TiO2 and ZnO nanoparticles: a comprehensive evaluation DOI: 10.1038/s41598-023-34120-z -
hyder 0.8
“Characteristic apatite signal”
Mirkovic 等 - 2018 - Structural, Morphological and Electrical Propertie DOI: 10.2298/SOS1801095M
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.