What absorbs at 659 cm⁻¹ in an FTIR spectrum?
A band near 659 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 5 cited sources
Quick answer
A band near 659 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.
Iespējamie funkcionālo grupu piešķīrumi
| Funkcionālā grupa | Atbalstošie fakti | Citētie avoti | Augstākā pārliecība |
|---|---|---|---|
| Phosphate (PO4) | 2 | 1 | 1,0 |
| Carbon dioxide | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
Rangs atspoguļo uzkrātos literatūras pierādījumus, nevis vienu autoritatīvu noteikumu. Vienmēr apstipriniet atbilstoši parauga kontekstam.
Possible materials
| Materiāls | Atbalstošie pīķi | Overlapping groups | Citētie avoti |
|---|---|---|---|
| bentonite | 659, 882, 918 | Metal oxygen | 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 659 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.
Literatūra aiz šiem piešķīrumiem
-
Alkyl C-H pārliecība 1,0
“and 3-S-(C-S cm-1 659 for thioethers, CH stretch).”
Rajakumar 等 - 2015 - Antiplasmodial activity of eco-friendly synthesize DOI: 10.1007/s00436-015-4318-1 -
Phosphate (PO4) pārliecība 1,0
“2023, 37(3) Structure and properties of strontium phosphate glasses modified with aluminum oxide 659 cm-1 1099 is attributed to an asymmetric stretching vibration of P-O.”
El-Damrawi 等 - 2023 - STRUCTURE AND PROPERTIES OF STRONTIUM PHOSPHATE GL DOI: 10.4314/bcse.v37i3.9 -
pārliecība 1,0
“cm-1 cm-1 But the peak at 659 and 780 corresponds to stretching vibration of Al-O in octahedral and tetrahedral coordination [15].”
Loganathan 和 Chandrasekar - 2013 - Analysis of Surface Tracking of Micro and Nano Siz DOI: 10.5370/JEET.2013.8.2.345 -
Carbon dioxide pārliecība 1,0
“Three frequency regions were identified where carbon dioxide absorbs IR light: the bending vibration at 659 cm-1;”
Sorption of CO2, CH4 and Their Mixtures in Amorphous Poly(2,6-dimethyl-1,4-phenylene)oxide (PPO) DOI: 10.3390/polym15051144 -
pārliecība 0,9
“Explicitly stated: 'endothermic peaks at 659 and 940 are due to the montmorillonite dehydroxy'”
Rehydration Driven Na-Activation of Bentonite—Evolution of the Clay Structure and Composition DOI: 10.3390/ma14247622
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