Hvad absorberer ved 1021 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 1021 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 1021 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 |
|---|---|---|---|
| C-O single bond | 13 | 13 | 1,0 |
| Methacrylate | 11 | 11 | 1,0 |
| Acetate | 11 | 11 | 1,0 |
| Methoxy (OCH3) | 10 | 10 | 1,0 |
| Phosphate (PO4) | 5 | 5 | 1,0 |
| Silicon-oxygen (Si-O) | 4 | 4 | 1,0 |
| Amide | 4 | 4 | 1,0 |
| Hydroxyl (O-H) | 4 | 4 | 1,0 |
| Siloxane (Si-O-Si) | 2 | 2 | 1,0 |
| Metal oxygen | 2 | 2 | 1,0 |
| Ketone | 2 | 2 | 1,0 |
| Ester | 2 | 2 | 1,0 |
| Carboxyl (COOH) | 2 | 2 | 1,0 |
| Carbonyl (C=O) | 2 | 2 | 1,0 |
| Phosphorus | 1 | 1 | 1,0 |
| N n bond | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Thiocarbonyl | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Oxygen heterocycle | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| S eq o | 1 | 1 | 1,0 |
| Sulfonyl | 1 | 1 | 1,0 |
| Carbonate | 1 | 1 | 1,0 |
| Carbohydrate | 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 | 1021, 1660, 2930 | Acetate, Methacrylate, C-O single bond | 1 |
| polysulfone | 1021, 1700, 2941 | Methacrylate, Acetate, C-O single bond | 1 |
| Polyethylene | 1021, 1737, 1720 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| montmorillonite | 1021, 1637, 523 | Methacrylate, Acetate | 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 1021 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
-
Acetate tillid 1,0
“As a reference band 1021 was chosen which is assigned to the C-O stretching vibration of carbohydrates, such as the”
FTIR as an easy and fast analytical approach to follow up microbial growth during fungal pretreatment of poplar wood with Phanerochaete chrysosporium DOI: 10.1016/J.MIMET.2018.01.004 -
Carbonate tillid 1,0
“At 24 h (Figure 5A), in all thicknesses, nesses, the behavior is similar: a peak corresponding to the presence of OH bonds, folthe behavior is similar: a peak corresponding to the presence of OH bonds, followed cm-1, lowed by a peak corresp”
Remineralization Potential of Three Restorative Glass Ionomer Cements: An In Vitro Study DOI: 10.3390/jcm12062434 -
tillid 1,0
“2014 1041 Si-O stretching 1021 1027 1035”
Hayati-Ashtiani - 2012 - Use of FTIR Spectroscopy in the Characterization o DOI: 10.1080/02726351.2011.615895 -
Hydroxyl (O-H) tillid 1,0
“A peak at cm-1 1021 was detected for alginate, FHO, and FHO-A which can be assigned to O-H bending [26].”
Kim 等 - 2019 - The Application of Alginate Coated Iron Hydroxide DOI: 10.3390/app9183835 -
Siloxane (Si-O-Si) tillid 1,0
“Peak at 1021 cm-1 assigned to symmetric vibration of Si-O-Si.”
Thermal, Rheological, Mechanical and Morphological Behavior of High Density Polyethylene and Carboxymethyl Cellulose Blend DOI: 10.1007/s10924-016-0880-6 -
Acetate tillid 1,0
“The PHP method proved to be a convenient and reliable cm-1 The peak at 1021 is due to C-O bending vibration and method of quantifying the presence of (cid:533).CD on the functionalised cm-1 the absorption band at 1152 is due to C-O-C (alkyl”
A new approach for the functionalisation of polysulfone with β-cyclodextrin DOI: 10.1088/2053-1591/ab35f3 -
Sulfonyl tillid 1,0
“adsorption peak due to C-O stretching at 1105 By comparing spectra of polymer blend membrane with that for GA-cross-linked PVA membrane, new absorption bands are cm-1 noticed at 1021 and 1112 due to the symmetric and asymmetric O=S=O stretc”
Highly Conductive Polyelectrolyte Membranes Poly(vinyl alcohol)/Poly(2-acrylamido-2-methyl propane sulfonic acid) (PVA/PAMPS) for Fuel Cell Application DOI: 10.3390/polym13162638 -
Acetate tillid 1,0
“The displayed frequencies for HPβCD were identified at 3332.04 and 1020.70 cm-1 The phase solubility analysis was executed to examine the solubility of SA in HPβCD that represent the stretching vibration of the C-O-C and O-H moiety.”
Hydroxypropyl–Cyclodextrin for Delivery of Sinapic Acid via Inclusion Complex Prepared by Solvent Evaporation Method DOI: 10.3390/pr10102046
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