What absorbs at 3696 cm⁻¹ in an FTIR spectrum?
A band near 3696 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 3696 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 |
|---|---|---|---|
| Hydroxyl (O-H) | 8 | 8 | 1,0 |
| Silicon-oxygen (Si-O) | 3 | 3 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 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 |
|---|---|---|---|
| kaolinite | 3696, 693, 798 | Hydroxyl (O-H), Silicon-oxygen (Si-O), Silicon (Si) | 4 |
| polyvinylpyrrolidone | 3696, 1660, 1700 | Hydroxyl (O-H) | 1 |
| polyvinyl alcohol | 3696, 1141, 1640 | Hydroxyl (O-H) | 1 |
| hematite | 3696, 1030, 469 | Hydroxyl (O-H), Silicon-oxygen (Si-O), Siloxane (Si-O-Si) | 1 |
| polypropylene | 3696, 1030, 1600 | 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 3696 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
-
Hydroxyl (O-H) pārliecība 1,0
“The peaks at 3619 and 3696 cm-1 are attributed to - OH vibration, which belong to the absorption of outer and inner hydroxyl groups, respectively [16].”
Study on Gemological Characteristics of Blue Sapphires from Baw-Mar Mine, Mogok, Myanmar DOI: 10.3390/cryst11111275 -
Hydroxyl (O-H) pārliecība 1,0
“The spectra of [O-H] stretching of the inner-surface hydroxyl of S01, S02, S03, S04, cm-1, S05, and S06 show similar absorption bands at 3695.3, 3694.8, 3695.2, 3695.4, 3695.5 and 3695.9 cm-1 respectively.”
Unique Halloysite Nanotubes–Polyvinyl Alcohol– Polyvinylpyrrolidone Composite Complemented with Physico–Chemical Characterization DOI: 10.3390/polym9060207 -
Hydroxyl (O-H) pārliecība 1,0
“LLM confirmed rule peak-group candidate”
Ahmad 等 - 2017 - XRD and FTIR study of the effect of Ultra High Mol DOI: 10.1063/1.4981852 -
Alkyl C-H pārliecība 1,0
“the presence of two new weak bands at approximately 2920 2850cm-1 attributed, respectively, to the symmetric The FTIR spectra of kaolinite/urea intercalate and 3620cm-1 groups and asymmetric stretching vibrations of the -CH (Figure 1(c)) sh”
Guessoum 等 - 2012 - Effects of Kaolin Surface Treatments on the Thermo DOI: 10.1155/2012/549154 -
pārliecība 1,0
“The absorption bands at 3696, 3622, 3450, 1033, cm-1, cm-1 Si-O stretching vibrations are observed at 800-1200 914, 790, 693, 538, and 468 distinctly indicated that”
The Fourier transform infrared spectroscopy (FTIR) analysis for the clay mineralogy studies in a clastic reservoir DOI: 10.1007/s13202-021-01449-y -
Hydroxyl (O-H) pārliecība 1,0
“LLM confirmed rule peak-group candidate”
Ma 等 - 2019 - Investigation of the Optical, Physical, and Chemic DOI: 10.3390/su11143803 -
Hydroxyl (O-H) pārliecība 1,0
“LLM confirmed rule peak-group candidate”
Madikizela 等 - 2017 - Physicochemical Characterization and In Vitro Eval DOI: 10.17159/0379-4350/2017/v70a016 -
Hydroxyl (O-H) pārliecība 1,0
“The bands located around ~3432, ~3624, and ~3696 cm-1 were characteristic of OH group vibration elongation whereas the band ~2355 could Table 4.”
Structural Study of Nano-Clay and Its Effectiveness in Radiation Protection against X-rays DOI: 10.3390/nano12142332
Vai jums ir spektrs ar šo joslu?
Augšupielādējiet savu FTIR spektru un dažu sekunžu laikā iegūstiet pilnu interpretācijas ziņojumu — maksimumu piešķīrumus ar literatūras atsaucēm, bibliotēku saskaņošanu un pārliecības līmeņa pierādījumu ķēdi.