Hvad absorberer ved 1770 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 1770 cm⁻¹ kan pege på flere funktionelle grupper. Nedenfor er de mest sandsynlige tildelinger, rangeret efter hvor meget publiceret bevis der understøtter hver — hver enkelt spores til litteratur (DOI) og krydsvalideres mod vores 130.000+ referencespektre og vidensgraf.
Backed by 8 cited sources
Hurtigt svar
Et bånd nær 1770 cm⁻¹ fortolkes normalt ved at kontrollere, hvilke funktionelle grupper der gentagne gange forekommer der i litteraturen, og derefter bekræfte mindst en eller to yderligere peaks i den samme prøve. Denne side rangerer disse tildelinger efter akkumuleret evidens snarere end efter en enkelt fast lærebogsregel.
Mulige funktionelle gruppetildelinger
| Funktionel gruppe | Understøttende fakta | Citerede kilder | Højeste tillid |
|---|---|---|---|
| Carbonyl (C=O) | 15 | 13 | 1,0 |
| Carboxyl (COOH) | 12 | 12 | 1,0 |
| Methacrylate | 9 | 9 | 1,0 |
| Acetate | 9 | 9 | 1,0 |
| Ester | 8 | 8 | 1,0 |
| Amide | 8 | 8 | 1,0 |
| Ketone | 7 | 7 | 1,0 |
| Aldehyde (CHO) | 3 | 3 | 1,0 |
| Anhydride | 2 | 2 | 1,0 |
| Alkene (C=C) | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| Methoxy (OCH3) | 2 | 2 | 1,0 |
| C-O single bond | 2 | 2 | 1,0 |
| Aromatic ring | 2 | 1 | 1,0 |
| Imide | 2 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Lipid | 1 | 1 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
Rangering afspejler akkumuleret litteraturevidence, ikke en enkelt fast regel. Bekræft altid mod din prøvekontekst.
Mulige materialer
| Materiale | Understøttende toppe | Overlappende grupper | Citerede kilder |
|---|---|---|---|
| Alginate | 1770, 1100, 1715 | Methacrylate, Acetate, Carboxyl (COOH) | 1 |
| epoxy | 1770, 1660, 1735 | Methacrylate, Acetate, Carbonyl (C=O) | 1 |
| polyimide | 1770, 1720, 1778 | Carbonyl (C=O), Methacrylate, Acetate | 1 |
| sodium alginate | 1770, 1636, 1080 | Methacrylate, Acetate, Carboxyl (COOH) | 1 |
Materialer vises kun, når den samme litteraturpulje understøtter dette bånd og mindst en yderligere karakteristisk top.
Spektrumlogik
Dette bånd bliver meningsfuldt kun, når det læses sammen med sine nabotoppe. I praksis ser analytikere først på tildelingerne ovenfor, og kontrollerer derefter, om den samme prøve også viser andre toppe, der forventes for det samme strukturelle motiv. Et enkelt bånd nær 1770 cm⁻¹ er normalt ikke nok til materialeidentifikation alene.
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
“dependent on the nature of the counterion, and has for example f 4+ been seen to increase in frequency in the sequence NH f Na+ Li+ in Raman experiments of perfluorodecanoic acid salts.37 and the corresponding Furthermore, the absence of th”
Tyrode 等 - 2007 - A study of the adsorption of ammonium perfluoronon DOI: 10.1021/jp063912h -
Aromatic ring tillid 1,0
“H+ estingly, by increasing the irradiation energy, the transmittancepeaksforC]Ostretchingvibrationaround1770cm(cid:3)1 and aromatic ring decrease while the transmittance peaks for cm(cid:3)1 C]O stretching vibration around 1700 and aromatic”
A mechanism of surface hardness enhancement for H+ irradiated polycarbonate DOI: 10.1039/d0ra05073c -
Acetate tillid 1,0
“In the EC spectrum, the strong doublet (1580-1700 carbonyl (1700-1840 and cm-1 cm-1) peaks at 1770 and 1796 are assigned to the C=O amine/hydroxyl groups (3130-3700 as shown in Fig.”
Yusuf 等 - 2016 - From crab shell to solar cell a gel polymer elect DOI: 10.1039/C6RA04188D. -
Acetate tillid 1,0
“The max cm-1 cm-1 peak at 1770 and 1395 in FTIR spectra of hydrolyzed dye showed that C-O groups appeared under relatively mild alkaline conditions.”
Zhao - 2019 - Study on the hydrolysis performance of phthalimide DOI: 10.1016/j.dyepig.2018.12.043 -
Anhydride tillid 1,0
“The grafting reaction gave rise to three new absorption bands, at 1713 and 1743 cm-1, associated with the carbonyl stretching of the carboxylic acids of the itaconic acid [25-27] and at 1770 cm-1 associated with a five-membered anhydride ri”
Aguilar-Bolados 等 - 2020 - SEBS-Grafted Itaconic Acid as Compatibilizer for E DOI: 10.3390/polym12030643 -
Carboxyl (COOH) tillid 1,0
“The assignments data of (pip)-magnesium, calcium, zinc, and iron (III) drug complexes show no absorption band cm-1, ν(C=O) at ~1770 which is characteristic of the stretching vibration of the carboxylic group, which is suggestive of the cont”
Synthesis and Spectroscopic Characterizations of Some Essential Metal Ion (MgII, CaII, ZnII, and FeIII) Pipemidic Acid Chemotherapeutic Agent Complexes DOI: 10.3390/xxxxx -
Acetate tillid 1,0
“In the FTIR spectrum of pure aspirin (Figure 7 A), = -1 several strong vibrations were presented at 1770 cm (C O Figure 8 X-ray diffraction pattern of (A) pure aspirin, (B) blank = -1 -1 stretch), 1600 cm (C C stretch), 1573 cm (OCO antisym”
Banerjee 等 - 2013 - Influence on variation in process parameters for t DOI: 10.1515/secm-2012-0078 -
Acetate tillid 1,0
“Secondly, the C=O absorption peaks at 1806 and 1770 of PMDA are in close cm-1) cm-1 Secondly, the C=O absorption peaks at 1806 and 1770 cm-1 of PMDA are in close proximity to that in PI (1777 and are overlapped (or merged) into the 1777 pea”
Interpenetration Networked Polyimide–Epoxy Copolymer under Kinetic and Thermodynamic Control for Anticorrosion Coating DOI: 10.3390/polym15010243
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