Hvad absorberer ved 1561 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 1561 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 1561 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 |
|---|---|---|---|
| N h | 5 | 4 | 1,0 |
| Carboxyl (COOH) | 4 | 4 | 1,0 |
| Amide | 4 | 4 | 1,0 |
| Hydrogen bond | 3 | 2 | 1,0 |
| Ester | 2 | 2 | 1,0 |
| Acetate | 2 | 2 | 1,0 |
| Oxygen heterocycle | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Amine primary | 1 | 1 | 1,0 |
| Lipid | 1 | 1 | 1,0 |
| Fatty acid | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Hydroxyl (O-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 |
|---|---|---|---|
| starch | 1561, 1650, 1540 | Amide | 1 |
| graphene | 1561, 1720, 2097 | Amide, Carboxyl (COOH) | 1 |
| CS | 1561, 1645, 1720 | Amide, Carboxyl (COOH) | 1 |
| CA | 1561, 1045, 1650 | Amide, Carboxyl (COOH) | 1 |
| polyaniline | 1561, 1565, 1570 | Amide | 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 1561 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
-
Hydroxyl (O-H) tillid 1,0
“Moreover, the new absorption peaks at 1372, 1508, 1561 cm-1 nium hydroxide (100 ml) was placed into a 250 ml round bottom and 1692 representing the C N stretching, C C stretching of flask, and then 4.0 g of tetraethoxyorthosilane (TEOS) was”
Stopband attenuation of silica spheres by attaching aniline and polyaniline DOI: 10.1016/j.synthmet.2013.03.007 -
Amide tillid 1,0
“110 × 100, = Index(CI%) (5) Crystallinity responsible for aliphatic CH stretching whereas the band 𝐼 1561cm-1 110 at was attributed to amide stretching of C=O.”
Anusha 和 Fleming - 2016 - Synthesis and Characterization of Chitosan Nanoagg DOI: 10.1155/2016/5379424 -
Alkene (C=C) tillid 1,0
“In the FTIR spectrum of rGO-TEPA, few representative peaks were identified at 1654, In the FTIR spectrum of rGO-TEPA, few representative peaks were identified at 1654, 1561, 1443, and 1186 cm-1, which can be attributed to the C=C stretching”
Cojocaru 等 - 2022 - Electrospun Nanofibrous Membranes Based on Citric DOI: 10.3390/polym14020294 -
N h tillid 1,0
“assigned the band at 1561 for aminopropyltrimethoxisilane SAM Chiang [32] deposited on silica gel to NH deformation modes with strong hydrogen bonding.”
Growth and organization of (3-Trimethoxysilylpropyl) diethylenetriamine within reactive amino-terminated self-assembled monolayer on silica DOI: 10.1016/S0079-6816(00)00024-1. -
tillid 1,0
“The most important element was the cm-1 increase in the intensity of peaks in the range of 3400-3200 wavenumbers, typical for cm-1, the presence of N-H bonds, and the increase in the absorption bands at 1561 and 1519 confirming the increase”
Optimization of Glutathione Adhesion Process to Modified Graphene Surfaces DOI: 10.3390/nano11030756 -
Ester tillid 1,0
“ν(C=O) A (at 1561 and 1410 The ester band in curve (split into two components, cm-1) at 1737 and 1728 is also very weak.”
Fourier Transform Infrared (FTIR) Spectroscopic Analyses of Microbiological Samples and Biogenic Selenium Nanoparticles of Microbial Origin: Sample Preparation Effects DOI: 10.3390/molecules -
Amide tillid 1,0
“The remarkable findings of this cm-1 cm-1 band at 1638 - 1561 amide II band at 1561 and study have been proven to be practically important in the cm-1.”
Koutb 等 - 2021 - Paclitaxel production by endophytic fungus, Neopes DOI: 10.30955/gnj.003839 -
Amide tillid 1,0
“spectrumsindicatehigherphospholipidcontent.Intheinterval Typical gluten bands are Amide I (80 % C-O stretch, 10 % cm-1 cm-1, 3100-2750 C-N stretch) at 1654 Amide II (60 % N-H bend, 30 % bands originating from stretch vibrations of C-Nstretc”
Pourfarzad 等 - 2015 - Serish inulin and wheat biopolymers interactions i DOI: 10.1007/s13197-015-1939-4
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