What absorbs at 3388 cm⁻¹ in an FTIR spectrum?
A band near 3388 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
Ātra atbilde
A band near 3388 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) | 5 | 5 | 1,0 |
| N h | 4 | 4 | 1,0 |
| Methoxy (OCH3) | 2 | 2 | 1,0 |
| Methacrylate | 2 | 2 | 1,0 |
| C-O single bond | 2 | 2 | 1,0 |
| Acetate | 2 | 2 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
Rangs atspoguļo uzkrātos literatūras pierādījumus, nevis vienu autoritatīvu noteikumu. Vienmēr apstipriniet atbilstoši parauga kontekstam.
Iespējamie materiāli
| Materiāls | Atbalstošie pīķi | Pārklājošās grupas | Citētie avoti |
|---|---|---|---|
| PMMA | 3388, 1722, 1383 | Methacrylate, Methoxy (OCH3) | 1 |
| silver nanoparticles | 3388, 1636, 1631 | Hydroxyl (O-H), Methacrylate, N h | 1 |
Materiāli tiek parādīti tikai tad, ja šo joslu un vismaz vienu papildu raksturīgo pīķi atbalsta tā pati literatūras kopa.
Spektra loģika
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 3388 cm⁻¹ is usually not enough for material identification by itself.
Reālās pasaules izmantošana
Šāda veida vaicājums ir izplatīts polimēru identificēšanā, nezināmas plastmasas skrīningā, kvalitātes kontroles problēmu risināšanā, pārstrādāto materiālu pārbaudē un ar literatūru pamatotā pīķu piešķīruma pārskatā.
Biežākās kļūdas
- Vienas izolētas joslas uzskatīšana par materiāla pierādījumu, nepārbaudot vismaz vienu vai divus atbalsta pīķus.
- Ignorējot pārklāšanos: vairākas funkcionālās grupas var dot ieguldījumu tuvu tam pašam viļņa skaitlim.
- Izlaist validāciju, ja piedevas, maisījumi, oksidācija vai piesārņojums var izkropļot spektru.
Verifikācijas padoms
Ja joprojām pastāv neskaidrība, apstipriniet hipotēzi ar DSC, GC-MS vai TGA, īpaši maisījumiem, noārdītiem paraugiem un pildītiem polimēriem.
Literatūra aiz šiem piešķīrumiem
-
Hydroxyl (O-H) pārliecība 1,0
“Earlier studies have established cm-1, cm-1, cm-1, of tea extracts containing polyphenols have appeared at 3388 1636 and 1039 which that the FTIR bands of tea extracts containing polyphenols have appeared at 3388 cm-1, 1636 cm-1, are referr”
Aziz 等 - 2017 - From Insulating PMMA Polymer to Conjugated Double DOI: 10.3390/polym9110626 -
Hydrogen bond pārliecība 1,0
“LLM confirmed rule peak-group candidate”
Xiao 等 - 2020 - Preparation and characterization of broken-rice st DOI: 10.1016/j.ijbiomac.2020.05.182 -
Acetate pārliecība 1,0
“of polyphenols in different tea extracts (black, oolong, and green) due to O-H/N-H, C=C, sent results are consistent with those of previous studies that demonstrated the presence cm-1, cm-1, cm-1 C-O-C stretches at 3388 1636 and 1039 [51-55”
Green Synthesis of Silver and Titanium Oxide Nanoparticles Using Tea and Eggshell Wastes, Their Characterization, and Biocompatibility Evaluation DOI: 10.3390/su151511858 -
Amide pārliecība 1,0
“ary structure of the protein, while the amide II band indicates the in-plane folding of the The FTIR spectra of OMC-SPE/Lac (Figure 1) show prominent peaks at 3388, 1655, cm-1.”
Development of a Novel Electrochemical Biosensor Based on Organized Mesoporous Carbon and Laccase for the Detection of Serotonin in Food Supplements DOI: 10.3390/chemosensors10090365 -
Hydroxyl (O-H) pārliecība 1,0
“LLM confirmed rule peak-group candidate”
Efe 等 - 2013 - Synthesis of 4-Acryloylmorpholinebased Hydrogels DOI: 10.5935/0103-5053.20130107 -
pārliecība 1,0
“Therefore, infrared spectra in the region of 4000-2750 showed 448 cm-1 diclofenac bands at 3388 and 2357 assigned to free and bound N-H stretching,”
Franca 等 - 2020 - Monitoring diclofenac adsorption by organophilic a DOI: 10.1016/j.envpol.2013.04.012 -
pārliecība 1,0
“The peaks at 3387.80 represent amines N-H stretch and”
Biodegradation of Azo Dye Methyl Red by Pseudomonas aeruginosa: Optimization of Process Conditions DOI: 10.3390/ijerph19169962 -
Hydroxyl (O-H) pārliecība 1,0
“Due to the high capacity of silica to adsorb water, the absorption bands resulting from the vibrations of the O-H bond are located at the following positions: 3388 cm-1 (O-H sv) and 1513 cm-1 (O-H bv) [54].”
Chemical Doping of a Silica Matrix with a New Organic Dye from the Group of Heterocyclic Compounds—Chemical, Optical and Surface Characteristics DOI: 10.3390/cryst12040478
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