What absorbs at 776 cm⁻¹ in an FTIR spectrum?
A band near 776 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
Mabilis na sagot
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.
Mga posibleng pagtatalaga ng functional-group
| Grupong functional | Mga sumusuportang katotohanan | Mga nasiping sanggunian | Pinakamataas na kumpiyansa |
|---|---|---|---|
| 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 |
Ang pagraranggo ay sumasalamin sa naipon na ebidensya ng literatura, hindi isang solong awtoritatibong tuntunin. Palaging kumpirmahin laban sa konteksto ng iyong sample.
Mga posibleng materyales
| Materyal | Sumusuportang mga peak | Mga overlapping na grupo | Mga nasiping sanggunian |
|---|---|---|---|
| NiO | 776, 1006, 1450 | Metal oxygen | 1 |
Ang mga materyales ay ipinapakita lamang kapag ang parehong literatura pool ay sumusuporta sa banda na ito at hindi bababa sa isang karagdagang katangian na tuktok.
Logic ng spectrum
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.
Paggamit sa totoong mundo
Ang uri ng query na ito ay karaniwan sa pagtukoy ng polymer, screening ng hindi kilalang plastic, pag-troubleshoot ng QC, pag-verify ng recycled na materyal, at pagsusuri ng pagtatalaga ng peak na may suporta ng literatura.
Mga karaniwang pagkakamali
- Pagtrato sa isang nakahiwalay na banda bilang patunay ng isang materyal nang hindi sinusuri ang hindi bababa sa isa o dalawang sumusuportang peak.
- Hindi pinapansin ang overlap: maraming functional group ang maaaring mag-ambag malapit sa parehong wavenumber.
- Pag-laktaw sa pagpapatunay kapag ang mga additives, blends, oxidation, o contamination ay maaaring mag-distort ng spectrum.
Payo sa pagpapatunay
Kapag nananatili ang kalabuan, patunayan ang hypothesis gamit ang DSC, GC-MS, o TGA, lalo na para sa mga blend, degraded na sample, at filled polymers.
Literatura sa likod ng mga pagtatalagang ito
-
Phosphate (PO4) kumpiyansa 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 kumpiyansa 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 kumpiyansa 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) kumpiyansa 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 -
kumpiyansa 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) kumpiyansa 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 -
kumpiyansa 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) kumpiyansa 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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