What absorbs at 666 cm⁻¹ in an FTIR spectrum?
A band near 666 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
Quick answer
A band near 666 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 |
|---|---|---|---|
| Hydroxyl (O-H) | 4 | 3 | 1,0 |
| C-O single bond | 2 | 2 | 1,0 |
| Carboxyl (COOH) | 2 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 0,9 |
Clasamentul reflectă dovezile acumulate din literatură, nu o singură regulă autoritară. Confirmați întotdeauna în contextul mostrei dvs.
Possible materials
| Material | Vârfuri suport | Overlapping groups | Surse citate |
|---|---|---|---|
| graphene oxide | 666, 1150, 3400 | Hydroxyl (O-H), C-O single bond, Carboxyl (COOH) | 1 |
| SnO2 | 666, 2800, 1547 | Hydroxyl (O-H) | 1 |
| chitosan | 666, 1650, 1655 | Hydroxyl (O-H), C-O single bond | 1 |
| hydrogel | 666, 1632, 1062 | Carboxyl (COOH), Hydroxyl (O-H) | 1 |
Materials are shown only when the same literature pool supports this band and at least one additional characteristic peak.
Spectrum logic
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 666 cm⁻¹ is usually not enough for material identification by itself.
Real-world usage
This type of query is common in polymer identification, unknown plastic screening, QC troubleshooting, recycled-material verification, and literature-backed peak assignment review.
Common mistakes
- Treating one isolated band as proof of a material without checking at least one or two supporting peaks.
- Ignoring overlap: multiple functional groups can contribute near the same wavenumber.
- Skipping validation when additives, blends, oxidation, or contamination may distort the spectrum.
Verification advice
When ambiguity remains, validate the hypothesis with DSC, GC-MS, or TGA, especially for blends, degraded samples, and filled polymers.
Literatura din spatele acestor atribuiri
-
Hydroxyl (O-H) încredere 1,0
“The peak at 666 cm-1is due to the vibration of Sn-OH terminal bonds.”
Koshy 等 - 2014 - Optical Properties of SnO2 Nanoparticles DOI: 10.1063/1.4898239 -
C c single bond încredere 1,0
“cm-1 cm-1 cm-1 1412 (C-C str in aromatic rings), along with splitting of 672 peak into two peaks 706 & 666 cm-1 (benzene derivatives).”
Experimental evaluation of cobalt adsorption capacity of walnut shell by organic acid activation DOI: 10.1038/s41598-023-33902-9 -
Alkyl C-H încredere 1,0
“AMPS revealed peaks at 2,987 representing the C-H stretching frequency of CH 2, while peaks around 1,666 cm-1 C=O and 1,613 were due to stretchingand N-H bending, 2 respectively.”
Malik 等 - 2020 - ChitosanXanthan Gum Based Hydrogels as Potential DOI: 10.3389/fchem.2020.00050 -
Acetate încredere 1,0
“The characteristic vibrational bands of MPN at 666 610 are due to C-O-H bending in the carboxylic group (Cielecka-Piontek et al., 2013).”
Muneer 等 - 2020 - Development and characterization of meropenem dry DOI: 10.1016/j.ijpharm.2020.119684 -
Silicon (Si) încredere 1,0
“The band at 666 is assigned to the stretching vibration of Si-O-Si of tetrahedral [SiO 4] units [17].”
Structure and ionic conductivity of nitrated lithium disilicate (LiSiON) glasses DOI: 10.1016/j.matchemphys.2018.02.045 -
C-O single bond încredere 1,0
“894 COC, CCO, and CCH deformation and stretching Cellulose 666 C-OH out-of-plane bending Cellulose”
Effect of Alkaline Treatment and Graphene Oxide Coating on Thermal and Chemical Properties of Hemp ( DOI: 10.1080/15440478.2022.2053265 -
Metal oxygen încredere 0,9
“Same band as above.”
Urea combustion synthesis of nano-structure bimetallic perovskite FeMnO3 and mixed monometallic iron manganese oxides: effects of preparation parameters on structural, opto-electronic and photocatalytic activity for photo-degradation of Basic Blue 12 DOI: 10.1007/s10854-017-6568-4 -
încredere 0,8
“Text: 'and 666' in same context.”
Hu 等 - 2022 - Flotation Performance and Adsorption Mechanism of DOI: 10.3390/min12040441
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