What absorbs at 3558 cm⁻¹ in an FTIR spectrum?
A band near 3558 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 3 cited sources
Hurtigt svar
A band near 3558 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 |
|---|---|---|---|
| Water (H2O) | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 2 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
Rangering afspejler akkumulerede litteraturbeviser, ikke en enkelt autoritativ regel. Bekræft altid mod din prøvekontekst.
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 3558 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
-
Carboxyl (COOH) tillid 1,0
“At 280 °C, EVA lost an acetic acid group, and the absorption peaks of -OH/water (3735,3558 cm-1), C=O (1754 cm-1), and R-CH3 (1460 cm-1) appeared in the spectrogram.”
Enhancing Char Formation and Flame Retardancy of Ethylene-Vinyl Acetate Copolymer (EVA)/Aluminum Hydroxide (ATH) Composites by Grafting Ladder Phenyl/Vinyl Polysilsesquioxane (PhVPOSS) DOI: 10.3390/polym15153312 -
Water (H2O) tillid 1,0
“XRD analysis besides Biotite (around the band at 3558 The remaining bands corresponded Bououdina,M.;Bellucci,S.Structural cm-1 cm-1, to absorbed and adsorbed water (3432 and 1629 respectively) and atmospheric CO 2 StudyofNano-ClayandIts cm-”
Structural Study of Nano-Clay and Its Effectiveness in Radiation Protection against X-rays DOI: 10.3390/nano12142332 -
tillid 1,0
“determined in the region between 3558 and 3615 from N-H stretching of secondary amines.”
Silva 等 - 2018 - FOURIER TRANSFORM INFRARED SPECTROSCOPY, THERMOGRA DOI: 10.21577/0100-4042.20170168
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