Hvad absorberer ved 1689 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 1689 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 1689 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) | 5 | 4 | 1,0 |
| Carboxyl (COOH) | 4 | 2 | 1,0 |
| Methacrylate | 3 | 3 | 1,0 |
| Amide | 3 | 3 | 1,0 |
| Acetate | 3 | 3 | 1,0 |
| Alkene (C=C) | 3 | 3 | 1,0 |
| Protein beta sheet | 3 | 2 | 1,0 |
| Ketone | 2 | 2 | 1,0 |
| Ester | 2 | 2 | 1,0 |
| Methoxy (OCH3) | 2 | 2 | 1,0 |
| C-O single bond | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 2 | 1 | 1,0 |
| Protein beta turn | 1 | 1 | 1,0 |
| Isocyanate | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Metal oxygen | 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 |
|---|---|---|---|
| PVA | 1689, 1660, 2930 | Methacrylate, Carbonyl (C=O), Amide | 1 |
| Polyurethane | 1689, 2270, 1700 | Methacrylate, Carbonyl (C=O), Amide | 1 |
| TiO2 | 1689, 1700, 1093 | Methacrylate, Carboxyl (COOH) | 1 |
| ZnO | 1689, 1400, 3430 | Methacrylate, Amide | 1 |
| rGO | 1689, 2358, 2930 | Methacrylate, Amide | 1 |
| GO | 1689, 1720, 1182 | Methacrylate, Amide, 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 1689 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
-
Carbonyl (C=O) tillid 1,0
“Notably, the similar solvent, showed a similar spectral pattern cm-1 absorbance peaks around 1689, 1721 and 1740 qualitatively albeit different values of absorption denoted the absorption of the carbonyl functional group, intensity.”
Aziz 等 - 2020 - FTIR and HPLC-Based Metabolomics of Yacon Leaves E DOI: 10.22146/ijc.43453 -
Alkene (C=C) tillid 1,0
“There are C-O peak at 998 2 cm-1 cm-1 and C=C peak at 1689 indicating the formation of rGO.Moreover, the composite also has”
Nurdiansah 等 - 2020 - Synthesis of ZnOrGOTiO2 Composite and Its Photoc DOI: 10.1088/1757-899X/833/1/012028 -
Protein beta sheet tillid 1,0
“For the W60V mutant, although ported by the well-resolved spectral component at the IR response of the crystalline protein is similar to that cm(cid:4)1, b due to turn absorption (11), which is narrower 2m, the solution spectrum displays mi”
Structure, Stability, and Aggregation of β-2 Microglobulin Mutants: Insights from a Fourier Transform Infrared Study in Solution and in the Crystalline State DOI: 10.1016/j.bpj.2012.02.045 -
Metal oxygen tillid 1,0
“With the incorporation of GO with PVA, the FTIR spectra indicated the formation of common properties such as O-H, C=O, C=C, -CH2, C-O stretching, and C-H bending at 3741.18 cm-1, 1774.84 cm-1, 1689.04 cm-1, 1511.76 cm-1, 1182.03 cm-1, and 8”
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 -
Alkene (C=C) tillid 1,0
“The formation of a new peak at around 1689 and 1575 cm-1, corresponding to the vibration modes of C=C bonds in the aromatic group, indicated the formation of graphite [26].”
Hung Kim Nguyen 等 - 2020 - Preparation of a Novel Flame Retardant Formulation DOI: 10.3390/ma13010054 -
Isocyanate tillid 1,0
“Eventually, allophanates, obtained from the reaction(s) between urethane and isocyanate may also be present [28,29] with C O stretching vibration absorption bands at 1710 cm-1 [30] or at 1724 and 1689 cm-1 [31].”
Chemical gradients in PIR foams as probed by ATR-FTIR analysis and consequences on fire resistance DOI: 10.1016/j.polymertesting.2020.106972 -
Protein beta turn tillid 1,0
“Band positions cm-1 cm-1 1689±2 1675±2 β-turn for different structures of HPF in PBS are and for cm-1 (α-helix) 1658±1 (a peak is observed on curve 1) (there is a shoulder on curve 1), cm-1 1633±2 (β-sheet) and (this band is masked on curve”
Rugal 等 - 2007 - Interaction of fibrinogen with nanosilica DOI: 10.2478/s11532-006-0067-4 -
Amide tillid 1,0
“cm-1 C1O, The 1734 band results from BV ring A while that cm-1 C19O.17,23,24 at 1704 is due to ring D The 1689 cm-1 (-)/1682 band is due to amide I (loop/turn) or a (+)”
Stojkovic 等 - 2014 - FTIR Spectroscopy Revealing Light-Dependent Refold DOI: 10.1021/jz501189t
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