What absorbs at 776 cm⁻¹ in an FTIR spectrum?
Et bånd nær 776 cm⁻¹ kan peke på flere funksjonelle grupper. Nedenfor er de mest sannsynlige tildelingene, rangert etter hvor mye publiserte bevis som støtter hver — hver enkelt sporbar til litteratur (DOI) og kryssvalidert mot våre 130 000+ referansespektre og kunnskapsgraf.
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Raskt svar
A band near 776 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.
Mulige funksjonelle gruppe-tilordninger
| Funksjonell gruppe | Støttende fakta | Siterte kilder | Toppkonfidens |
|---|---|---|---|
| Silicon-oxygen (Si-O) | 5 | 5 | 1.0 |
| Silicon (Si) | 3 | 3 | 1.0 |
| Metal oxygen | 1 | 1 | 1.0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Methyl | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| Phosphate (PO4) | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 0.8 |
Rangeringen gjenspeiler akkumulert litteraturbevis, ikke en enkelt autoritativ regel. Bekreft alltid mot prøvekonteksten din.
Mulige materialer
| Materiale | Støttetopper | Overlappende grupper | Siterte kilder |
|---|---|---|---|
| NiO | 776, 1006, 1450 | Metal oxygen | 1 |
Materialer vises kun når samme litteraturbase støtter dette båndet og minst en annen karakteristisk topp.
Spektrum-logikk
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 776 cm⁻¹ is usually not enough for material identification by itself.
Virkelig bruk
Denne typen forespørsel er vanlig i polymeridentifikasjon, screening av ukjent plast, feilsøking i kvalitetskontroll, verifisering av resirkulert materiale og litteraturstøttet gjennomgang av topptilordning.
Vanlige feil
- Behandle ett isolert bånd som bevis på et materiale uten å sjekke minst en eller to støttende topper.
- Ignorerer overlapping: flere funksjonelle grupper kan bidra nær samme bølgetall.
- Hopp over validering når tilsetningsstoffer, blandinger, oksidasjon eller forurensning kan forvrenge spekteret.
Verifiseringsråd
Når tvetydighet gjenstår, valider hypotesen med DSC, GC-MS eller TGA, spesielt for blandinger, nedbrutte prøver og fylte polymerer.
Litteratur bak disse tilordningene
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Phosphate (PO4) konfidens 1.0
“The cm-1, assignments of the phosphate related peaks are as follows: P-O stretching at 776 P-O-C cm-1,”
An appraisal of the thermal decomposition mechanisms of ILs as potential lubricants DOI: 10.1002/ls.1457 -
Alkyl C-H konfidens 1.0
“in vitro duced during incubation is based on methyl ester of cm-1, Produced CLA showed a weak peak at 776 which fatty acid by GC analysis (Devillard et al.”
Optimization of food-grade medium for co-production of bioactive substances by Lactobacillus acidophilus LA-5 for explaining pharmabiotic mechanisms of probiotic DOI: 10.1007/s13197-020-04894-5 -
N h konfidens 1.0
“Moreover, it is worth mentioning that F8815 has only primary amino groups as proved by the pair of peaks at 806 and 776 cm-1 cm-1 (NH bending, inset) [36], and the relative strong band at 1639 (NH stretching).”
Bellido-Aguilar 等 - 2019 - Effect of a fluoroalkyl-functional curing agent on DOI: 10.1016/j.surfcoat.2019.02.006 -
Carboxyl (COOH) konfidens 1.0
“The band cm-1 cm-1 at 776 was characterized as typical for guluronic acid [33] as well as the 791 cm-1 C.”
Soluble Extracellular Polymeric Substances Produced by Parachlorella kessleri and Chlorella vulgaris: Biochemical Characterization and Assessment of Their Cadmiumand Lead Sorption Abilities DOI: 10.3390/molecules27217153 -
konfidens 1.0
“was observed with a peak at 1270 cm-1, and the absorption bands related to the stretching vibrations of the Si-C bond and/or the stretching vibrations of the Si-O bond were observed at 776 cm-1 [35].”
Organic Bio-Based Aerogel from Food Waste: Preparation and Hydrophobization DOI: 10.3390/gels8110691 -
Silicon (Si) konfidens 1.0
“cm(cid:4)1 range [39, 40], whereas the band at 776 was the initial substitution of NiO/ CaO, the absorption related to the Si-O-Si symmetric stretches of nonedge exhibited gradual red shift (shift longer wavebridging oxygen atoms between te”
Impact of high NiO content on the structural, optical, and dielectric properties of calcium lithium silicate glasses DOI: 10.1007/s10854-022-08045-8 -
konfidens 1.0
“A new peak at 776 assigned to the Mn-O bond was found in cm-1 MnDBC, F 1M 3DBC, and F 3M 1DBC, while a new peak at 558 belonging to the Fe-O bond was found in FDBC, F 1M 3DBC, and F 3M 1DBC, which illustrated the formation of Fe oxides, Mn”
Liang 等 - 2022 - Adsorption of Atrazine by Fe-Mn-Modified Biochar DOI: 10.3390/agronomy12123097 -
Silicon (Si) konfidens 1.0
“Aromatic ring substitution is seen at 879 and 776 cm-1 Si-O 1425 region includes C stretching of heteroaromatic [57, 58].”
Biochar from co-pyrolysis of urban organic wastes—investigation of carbon sink potential using ATR-FTIR and TGA DOI: 10.1007/s13399-020-01000-9
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