Hvad absorberer ved 1700 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 1700 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 1700 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) | 168 | 141 | 1,0 |
| Amide | 117 | 107 | 1,0 |
| Carboxyl (COOH) | 94 | 84 | 1,0 |
| Methacrylate | 75 | 69 | 1,0 |
| Acetate | 75 | 69 | 1,0 |
| Ester | 69 | 64 | 1,0 |
| Ketone | 64 | 60 | 1,0 |
| Alkyl C-H | 21 | 17 | 1,0 |
| Hydroxyl (O-H) | 16 | 15 | 1,0 |
| C-O single bond | 15 | 13 | 1,0 |
| Methoxy (OCH3) | 14 | 12 | 1,0 |
| Alkene (C=C) | 12 | 11 | 1,0 |
| Carbohydrate | 10 | 9 | 1,0 |
| Urethane | 10 | 8 | 1,0 |
| Aromatic ring | 9 | 8 | 1,0 |
| N h | 9 | 8 | 1,0 |
| N-O bond | 8 | 8 | 1,0 |
| Protein | 7 | 7 | 1,0 |
| Hydrogen bond | 7 | 6 | 1,0 |
| Ring structure | 6 | 6 | 1,0 |
| S eq o | 5 | 5 | 1,0 |
| C c single bond | 5 | 4 | 1,0 |
| Water (H2O) | 4 | 4 | 1,0 |
| Aldehyde (CHO) | 4 | 3 | 1,0 |
| Imide | 3 | 3 | 1,0 |
| Secondary amine | 2 | 2 | 1,0 |
| C n single bond | 2 | 2 | 1,0 |
| Lipid | 2 | 2 | 1,0 |
| Nucleic acid | 2 | 2 | 1,0 |
| Phosphate (PO4) | 2 | 2 | 1,0 |
| C=n | 2 | 2 | 1,0 |
| Protein beta sheet | 2 | 2 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Quinone | 1 | 1 | 1,0 |
| Acetyl | 1 | 1 | 1,0 |
| N c o | 1 | 1 | 1,0 |
| Urea | 1 | 1 | 1,0 |
| Phosphorus | 1 | 1 | 1,0 |
| Lewis acid site | 1 | 1 | 1,0 |
| Amino acid | 1 | 1 | 1,0 |
| Oxygen heterocycle | 1 | 1 | 1,0 |
| Oxalate | 1 | 1 | 0,9 |
| Fluorine (C-F) | 1 | 0 | 1,0 |
| Nitrate | 1 | 0 | 0,7 |
Rangering afspejler akkumuleret litteraturevidence, ikke en enkelt fast regel. Bekræft altid mod din prøvekontekst.
Mulige materialer
| Materiale | Understøttende toppe | Overlappende grupper | Citerede kilder |
|---|---|---|---|
| polyester | 1700, 1250, 1720 | Carbonyl (C=O), Methacrylate, Amide | 1 |
| silver nanoparticles | 1700, 1636, 1631 | Methacrylate, Amide | 1 |
| honey | 1700, 2005, 1199 | Methacrylate, 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 1700 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
“It is rather interesting to detect a carboxyl group's peak (C=O) at 1700 cm-1, associated with an oleic acid epoxide, apparently decreased after polymerization.”
Bahadi 等 - 2021 - Synthesis and Characterization of Green Biodegrada DOI: 10.33263/BRIAC116.1435914371 -
tillid 1,0
“1700cm-1, and N-H bond stretching peak appeared from 4.”
Bawazeer 等 - 2022 - Biogenic Synthesis of Silver Nanoparticles Using R DOI: 10.1155/2022/7365931 -
Carbohydrate tillid 1,0
“LLM confirmed rule peak-group candidate”
Can 等 - 2023 - Choline Chloride-Based Deep Eutectic Solvent-Treat DOI: 10.3390/f14030569 -
Carbonyl (C=O) tillid 1,0
“confirmed significant protective of NaCl could be by FTIR-ATR to any large extent during the aging and no where the previously discussed peak shifts were not as profound degradation could be observed, there is a clear increase in the cm-1 a”
Carlsson 等 - 2013 - A Comparative Study of the Effects of Rinsing and DOI: 10.1021/jp3125582 -
Amide tillid 1,0
“The peak amounts (Gallardo-Velazquez, Osorio-Revilla, Loa, & 1547cm(cid:3)1 resulted from N-H bending and observed at Rivera-Espinoza, 2009) The band which varied between 1700cm(cid:3)1 C-N stretching vibrations of Amide II (Coates, 2000;”
Cebi 等 - 2020 - An evaluation of FTIR spectroscopy for prediction DOI: 10.1080/00218839.2019.1707009 -
Acetate tillid 1,0
“All spectra are cm-1, characterized by a major band centred at 1725 ascribed to the cm-1, free C O urethane groups, and another peak at about 1700”
Hydrogen bonding and thermomechanical properties of model polydimethylsiloxane based poly(urethane-urea) copolymers: Effect of hard segment content DOI: 10.1016/j.porgcoat.2015.06.015 -
Ring structure tillid 1,0
“carbonyls.20,62 observed between the D-ring peaks at 1700 and 1710 This is red-shift the vibrational frequency of The two peaks”
Chenchiliyan 等 - 2023 - Ground-state heterogeneity and vibrational energy DOI: 10.1063/5.0135268 -
Carbonyl (C=O) tillid 1,0
“The characteristic peak of FA could be seen around 1700 cm-1, which was due to the absorbance of the carbonyl group.”
Formation of Intermediate Amylose Rice Starch–Lipid Complex Assisted by Ultrasonication DOI: 10.3390/foods11162430
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