What absorbs at 2275 cm⁻¹ in an FTIR spectrum?
A band near 2275 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 6 cited sources
Hurtigt svar
A band near 2275 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 |
|---|---|---|---|
| Alkyl C-H | 2 | 2 | 1,0 |
| Lewis acid site | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Isocyanate | 1 | 1 | 1,0 |
| Nitrile | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 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 |
|---|---|---|---|
| polyurethane | 2275, 2270, 1700 | Alkyl C-H, Methoxy (OCH3) | 1 |
| titanium dioxide | 2275, 1716, 1724 | Alkyl C-H | 1 |
| MCM-41 | 2275, 2170, 1655 | Alkyl C-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 2275 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
“absorption peak at approximately 1700 cm-1, Since the isocynate has strong absorption peak between 2275 ~ 2263 the absence of the characteristic isocynate absorption peak indicates that most of the isocynate reacted with alcohol and formed”
Kim 和 Kang - 2012 - Optical properties of azo-chromophore attached on DOI: 10.1117/12.999810 -
Nitrile tillid 1,0
“cm(cid:0) cm(cid:0) (C-- 1 1 peak around 2275 indicates the nitrile group N).”
Biosynthesis of titanium dioxide nanoparticles for the photodegradation of dyes and removal of bacteria DOI: 10.1016/j.ijleo.2020.165728 -
Isocyanate tillid 1,0
“LLM confirmed rule peak-group candidate”
Synthesis and Characterization of Mesoporous Silica Functionalized with Calix[4]arene Derivatives DOI: 10.3390/ijms131013726 -
Alkyl C-H tillid 1,0
“absorptionat1600cm-1attributedtoaromaticbenzenering, C-5, 7, and 8 at δ 156.8, 156.3, and 94.5, whereas aromatic C 2275cm-1 proton at δ 5.89 (H-8) showed HMBC correlations with strong absorption band at due to C-H stretching H 1255cm-1 C-6,”
Guyasa 等 - 2018 - Antibacterial Activity of Two Flavans from the Ste DOI: 10.1155/2018/5870161 -
Acetate tillid 1,0
“corresponds to C-H twisting vibration, C-O/C-O-C/C-C stretching vibration and C-H wagging cm-1, is no sign of isocyanate asymmetric stretch from HDI at 2275 indicating unformed isocyanate β-(1→4) vibration of ester groups and/or glycosidic”
Synthesis and Characterization of Inulin-Based Responsive Polyurethanes for Breast Cancer Applications DOI: 10.3390/polym12040865 -
Lewis acid site tillid 1,0
“Besides the band at 2291 - 2296 (Ti+3), CH 3CN molecularly adsorbed on weak Lewis acid sites a band at 2275 - cm-1 attributed to physisorbed acetonitrile was observed in all spectra.”
Adsorption of acetonitrile and its reaction with oxygen on TiO<Subscript>2</Subscript>-supported Au — Rh bimetallic catalysts DOI: 10.1007/s11144-007-5120-6
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