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
Hurtigt svar
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.
Mulige funktionelle gruppetildelinger
| Funktionel gruppe | Understøttende fakta | Citerede kilder | Højeste tillid |
|---|---|---|---|
| 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 |
Rangering afspejler akkumulerede litteraturbeviser, ikke en enkelt autoritativ regel. Bekræft altid mod din prøvekontekst.
Mulige materialer
| Materiale | Understøttende toppe | Overlappende grupper | Citerede kilder |
|---|---|---|---|
| PMMA | 3388, 1722, 1383 | Methacrylate, Methoxy (OCH3) | 1 |
| silver nanoparticles | 3388, 1636, 1631 | Hydroxyl (O-H), Methacrylate, N h | 1 |
Materialer vises kun, når den samme litteraturpulje understøtter dette bånd og mindst en yderligere karakteristisk top.
Spektrumlogik
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.
Anvendelse i virkeligheden
Denne type forespørgsel er almindelig ved polymeridentifikation, screening af ukendt plast, fejlfinding i kvalitetskontrol, verifikation af genanvendt materiale og litteraturunderstøttet gennemgang af peak-tildeling.
Almindelige fejl
- Behandling af et isoleret bånd som bevis på et materiale uden at kontrollere mindst en eller to understøttende toppe.
- Ignorerer overlap: flere funktionelle grupper kan bidrage nær samme bølgetal.
- Spring validering over, når additiver, blandinger, oxidation eller forurening kan forvrænge spektret.
Verifikationsrådgivning
Når tvetydighed fortsat består, valider hypotesen med DSC, GC-MS eller TGA, især for blandinger, nedbrudte prøver og fyldte polymerer.
Litteratur bag disse tildelinger
-
Hydroxyl (O-H) tillid 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 tillid 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 tillid 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 tillid 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) tillid 1,0
“LLM confirmed rule peak-group candidate”
Efe 等 - 2013 - Synthesis of 4-Acryloylmorpholinebased Hydrogels DOI: 10.5935/0103-5053.20130107 -
tillid 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 -
tillid 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) tillid 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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