What absorbs at 667 cm⁻¹ in an FTIR spectrum?
A band near 667 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
Răspuns rapid
A band near 667 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.
Atribuiri posibile ale grupelor funcționale
| Grup funcțional | Fapte suport | Surse citate | Încredere maximă |
|---|---|---|---|
| Carbon dioxide | 5 | 5 | 1,0 |
| Hydroxyl (O-H) | 5 | 5 | 1,0 |
| Sulfate (SO4) | 3 | 3 | 1,0 |
| Alkyl C-H | 2 | 2 | 1,0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1,0 |
| Silicon (Si) | 2 | 2 | 1,0 |
| Water (H2O) | 2 | 2 | 1,0 |
| Metal oxygen | 2 | 2 | 1,0 |
| C-S single bond | 2 | 2 | 1,0 |
| Amino acid | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Nucleic acid | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Thiol | 1 | 1 | 1,0 |
Clasamentul reflectă dovezile acumulate din literatură, nu o singură regulă autoritară. Confirmați întotdeauna în contextul mostrei dvs.
Materiale posibile
| Material | Vârfuri suport | Grupuri suprapuse | Surse citate |
|---|---|---|---|
| Fe3O4 | 667, 2358, 1673 | Hydroxyl (O-H), Alkyl C-H | 1 |
| asphalt | 667, 1600, 1376 | Alkyl C-H, Hydroxyl (O-H) | 1 |
Materialele sunt afișate numai atunci când același grup de literatură susține această bandă și cel puțin un vârf caracteristic suplimentar.
Logica spectrului
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 667 cm⁻¹ is usually not enough for material identification by itself.
Utilizare în condiții reale
Acest tip de interogare este comun în identificarea polimerilor, screeningul materialelor plastice necunoscute, depanarea QC, verificarea materialelor reciclate și revizuirea atribuirii vârfurilor bazată pe literatură.
Greșeli comune
- Tratarea unei benzi izolate ca dovadă a unui material fără a verifica cel puțin unul sau două vârfuri de susținere.
- Ignorând suprapunerea: mai multe grupuri funcționale pot contribui în apropierea aceluiași număr de undă.
- Omiterea validării atunci când aditivii, amestecurile, oxidarea sau contaminarea pot distorsiona spectrul.
Sfat de verificare
Când ambiguitatea rămâne, validați ipoteza prin DSC, GC-MS sau TGA, în special pentru amestecuri, probe degradate și polimeri umpluți.
Literatura din spatele acestor atribuiri
-
C-S single bond încredere 1,0
“The second silicate bands are 4 cm-1 in C-S-H broadly characterized as O-Si-O deformation or bending modes, which occur near 451 470cm-1 cm-1 667cm-1 and in C-A-S-H and the band 663 or is due to Si-O-Si bending vibrations.”
He 等 - 2011 - Morphology and Structure of Aluminum Substituted C DOI: 10.4028/www.scientific.net/AMR.287-290.1193 -
încredere 1,0
“CR occurs at the peak of 1261 1094 1031 804.7 and 667 cm-1, cm-1 cm-1 The absorption peaks at 1261 1094 and 1031 are identified as the”
Liang 等 - 2017 - Thermo-stability and aging performance of modified DOI: 10.1016/j.matdes.2017.04.060 -
încredere 1,0
“cm(cid:1)1 a(l) peak at 667 indicates increasing or decreasing bridging coefficient as a function of photon The optical absorption hn oxygen (BO) in the glass system.”
Natural Fe3O4 nanoparticles embedded zinc-tellurite glasses: Polarizability and optical properties DOI: 10.1016/j.matchemphys.2012.11.040 -
Acetate încredere 1,0
“cm-1 cm-1 2,956 assigned to C-H stretching (-CH 2CH 2CH 2CH 3, & -CH=CH-), 1,610 and 1,667 cm-1 1H-NMR assigned to C=O stretching, 1,561 assigned to C=C stretching.”
Synthesis and Characterization of Organotin Containing Copolymers: Reactivity Ratio Studies DOI: 10.3390/molecules15031784 -
Sulfate (SO4) încredere 1,0
“The IR spectrum is dominated by the bands ascribed to gypsum at 3484 and 3398 (-OH stretch), cm-1 ν 1682 and 1619 (-OH deformation), 1095 (sulfate stretch), and 667 and 594 (sulfate 3”
New Insights into the Medieval Hispano-Muslim Panel Painting: The Alfarje Found in a Balearic Casal (Spain) DOI: 10.3390/molecules28031235 -
Carbon dioxide încredere 1,0
“The band centered at 667 due to CO 2.”
Cageao 等 - 2010 - Far-IR Measurements at Cerro Toco, Chile FIRST, R DOI: 10.1029/2005GL025114 -
Sulfate (SO4) încredere 1,0
“FTIR-ATR results of the KN-PL3A sample also present the PL3A sample also present the vibration bands referring to the sulphate group (SO42-) at cm-1, 42-) vibration bands referring to the sulphate group (SO at 1100 and 667 together 1100 and”
Mortars from the Palace of Knossos in Crete, Greece: A Multi-Analytical Approach DOI: 10.3390/min12010030 -
încredere 1,0
“This assignment also 3 cm-1 takes into account the S-O stretching vibrations that CaSO exhibits at 667 and 4 cm-1) that are noticed in the P1 spectrum (669;”
The Origin and Physico-Chemical Properties of Some Unusual Earth Rock Fragments DOI: 10.3390/app12030983
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