What absorbs at 1775 cm⁻¹ in an FTIR spectrum?
A band near 1775 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 1775 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 |
|---|---|---|---|
| Carbonyl (C=O) | 6 | 5 | 1,0 |
| Methacrylate | 5 | 5 | 1,0 |
| Carboxyl (COOH) | 5 | 5 | 1,0 |
| Acetate | 5 | 5 | 1,0 |
| Ketone | 4 | 4 | 1,0 |
| Ester | 4 | 4 | 1,0 |
| Amide | 4 | 4 | 1,0 |
| Alkyl C-H | 2 | 2 | 1,0 |
| Methoxy (OCH3) | 2 | 2 | 1,0 |
| C-O single bond | 2 | 2 | 1,0 |
| Carbohydrate | 2 | 2 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Imide | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| Alkene (C=C) | 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 |
|---|---|---|---|
| PVA | 1775, 1660, 2930 | Acetate, Methacrylate, Carbonyl (C=O) | 2 |
| cellulose nanocrystals | 1775, 1110, 1640 | Acetate, Methacrylate, Carbonyl (C=O) | 1 |
| magnetite | 1775, 1740, 1263 | Carboxyl (COOH), Methacrylate, Acetate | 1 |
| honey | 1775, 2005, 1199 | Methacrylate, Acetate | 1 |
| GO | 1775, 1720, 1182 | Methacrylate, Acetate, Carboxyl (COOH) | 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 1775 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
“Spectrum FTIR Carboxymethyl kappa-carrageenan Based on the FTIR spectrum, it appears that some of the hydroxyl groups have been replaced with carboxyl cm-1 cm-1 and 1417 confirming groups, indicated by the appearance of absorption peaks at”
The capability of nanomagnetite carboxymethyl kappa-carrageenan coated to adsorp metal ions DOI: 10.1063/5.0000680 -
Acetate tillid 1,0
“The absence of the vibration band located around 1775 is attributed to the elongated vibrations of the specific C=O bond of the hemicellulose residues”
Part A: Biodegradable Bio-Composite Film Reinforced with Cellulose Nanocrystals from Chaetomorpha linum into Thermoplastic Starch Matrices DOI: 10.3390/polym15061542 -
Carbohydrate tillid 1,0
“Sci.2022,12,9645 5of9 and 1775 cm-1 which are attributed to the carbohydrates and O-H stretching vibrations”
Botanical Origin Assessment of Honey Based on ATR-IR Spectroscopy: A Comparison between the Efficiency of Supervised Statistical Methods and Artificial Intelligence DOI: 10.3390/app12199645 -
Hydroxyl (O-H) tillid 1,0
“cm-1, cm-1, O-H, C=O, C=C, -CH 2, C-O stretching, and C-H bending at 3741.18 1774.84 cm-1, cm-1, cm-1, cm-1, 1689.04 1511.76 1182.03 and 882.79 respectively.”
Evaluation of Structural and Optical Properties of Graphene Oxide-Polyvinyl Alcohol Thin Film and Its Potential for Pesticide Detection Using an Optical Method DOI: 10.3390/photonics9050300 -
Acetate tillid 1,0
“1153cm(cid:3)1 which the carbonyl stretching vibration of six-membered cyclic (C-O stretching of ester) and (C-N stretching of aliphatic ester).17,18 1760cm(cid:3)1, anhydrides exhibited unique peaks at 1800 and amine and/or C-O stretching”
DSC-FTIR microspectroscopy used to investigate the heat-induced intramolecular cyclic anhydride formation between Eudragit E and PVA copolymer DOI: 10.1038/pj.2011.15; -
Acetate tillid 1,0
“The absorption bands observed at 1775 cm-1 and 1716 were attributed to the asymmetric and symmetric stretching of C=O in the imide ring, Polymers2017,9,734”
Preparation and Evaluation of a Polyimide-Coated Ultrafine Gilt Molybdenum Wire and Its Knitted Mesh Used for Electromagnetic Reflectors DOI: 10.3390/polym9120734 -
Alkyl C-H tillid 1,0
“In the Figure 4 (A) the shows crystalline and 2850 (CH stretching), 1775 (C=O stretchIndian Journal of Pharmaceutical Education and Research | Vol 52 | Issue 4 [Suppl] | Oct-Dec, 2018”
Udapurkar 等 - 2018 - Diosmin Phytosomes Development, Optimization and DOI: 10.5530/ijper.52.4s.73 -
tillid 0,8
“Attributed to specific vibration of thiophene.”
Surface Characterization of Modified Electrodes Based on 4-(Azulen-1-yl)-2,6-bis((E)-2-(thiophen-2-yl)vinyl)pyridine DOI: 10.3390/sym14122506
Har du et spektrum med dette bånd?
Upload dit FTIR-spektrum og få en fuld tolkningsrapport — peak-tildelinger med litteraturhenvisninger, biblioteksmatch og en tillidsvurderet beviskæde — på få sekunder.