Hvad absorberer ved 1570 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 1570 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 1570 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 | 19 | 18 | 1,0 |
| Carboxyl (COOH) | 15 | 10 | 1,0 |
| Amide | 13 | 11 | 1,0 |
| Secondary amine | 9 | 8 | 1,0 |
| Methacrylate | 8 | 7 | 1,0 |
| Acetate | 8 | 7 | 1,0 |
| Alkene (C=C) | 8 | 6 | 1,0 |
| Carbonyl (C=O) | 7 | 6 | 1,0 |
| Aromatic ring | 6 | 4 | 1,0 |
| Ketone | 5 | 4 | 1,0 |
| Ester | 5 | 4 | 1,0 |
| C n single bond | 4 | 4 | 1,0 |
| C=n | 4 | 4 | 1,0 |
| C c single bond | 4 | 4 | 1,0 |
| Alkyl C-H | 4 | 3 | 1,0 |
| Amine primary | 3 | 3 | 1,0 |
| Protein | 3 | 3 | 1,0 |
| Methoxy (OCH3) | 3 | 3 | 1,0 |
| C-O single bond | 3 | 3 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| Ring structure | 2 | 2 | 1,0 |
| N-O bond | 2 | 1 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
| Borate | 1 | 1 | 1,0 |
| Nucleic acid | 1 | 1 | 1,0 |
| Oxygen heterocycle | 1 | 1 | 1,0 |
| S eq o | 1 | 1 | 1,0 |
| Lipid | 1 | 1 | 1,0 |
| Quinone | 1 | 1 | 1,0 |
| Urethane | 1 | 1 | 0,9 |
Rangering afspejler akkumuleret litteraturevidence, ikke en enkelt fast regel. Bekræft altid mod din prøvekontekst.
Mulige materialer
| Materiale | Understøttende toppe | Overlappende grupper | Citerede kilder |
|---|---|---|---|
| cellulose | 1570, 1735, 1650 | Amide | 1 |
| starch | 1570, 1650, 1540 | Amide | 1 |
| HPMC | 1570, 1640, 1550 | Carboxyl (COOH), N h | 1 |
| edible oils | 1570, 1743, 1064 | Carboxyl (COOH) | 1 |
| oil | 1570, 1161, 1163 | Carboxyl (COOH), Amide | 1 |
| graphene | 1570, 1720, 2097 | 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 1570 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
“The cm-1 above mentioned maximum at the wavenumber of 1570 is also due to an absorption of carbonyl moieties, with the substantial shift towards lower energies resulting that the C=O absorption may be connected with a presence of two carbon”
Mechanical properties, chemical analysis and evaluation of antimicrobial response of Si-DLC coatings fabricated on AISI 316 LVM substrate by a multi-target DC-RF magnetron sputtering method for potential biomedical applications DOI: 10.1016/j.apsusc.2017.03.223 -
Acetate tillid 1,0
“The position of the C=O peak at 1570 cm-1 did not change at different”
Chen 等 - 2020 - Solubility Improvement of Progesterone from Solid DOI: 10.3390/polym12040854 -
C c single bond tillid 1,0
“9, the peak at wave number 1570 between polymer chains, which leads to the decrease in crysC-C C-N (which is responsible for and bending modes of tallinity of M 0.”
Effects of ionic liquid on the hydroxylpropylmethyl cellulose (HPMC) solid polymer electrolyte DOI: 10.1007/s11581-016-1768-0 -
Acetate tillid 1,0
“(OH stretching vibration), 1570 (C=O stretching vibration), 1570 (C=C aromatics), 1180 (C-O vibration) The XRD peaks for palladium has exhibited at 2”
Debataraja 等 - 2018 - Synthesis and Characterization of Nanocomposites o DOI: 10.22146/ijc.26660 -
Carboxyl (COOH) tillid 1,0
“0.0-4.0% methods involve measuring a new peak at 1570 which is 2.5%, 3.0%, 3.5%, and 4.0%) covered the range of FFA 24 C]O interrelated with the group of the carboxylic acid radical content in the samples (expressed as the percentage of ole”
Dong 等 - 2020 - An indirect analytical approach based on ATR-FTIR DOI: 10.1039/d0ra03668d -
Carboxyl (COOH) tillid 1,0
“and subsequently measuring the carboxylate anion band at 1570cm(cid:1)1, was established.”
Determination of the acid values of edible oils via FTIR spectroscopy based on the OH stretching band DOI: 10.1016/j.foodchem.2016.06.035 -
Hydroxyl (O-H) tillid 1,0
“metal-free organic dye combinations (Eosin+N3 and Eosin+N719) rGO shows a broad band at corresponding to the O-H 1570cm-1 stretching mode [46].”
Effect of co-sensitization in solar exfoliated TiO2 functionalized rGO photoanode for dye-sensitized solar cell applications DOI: 10.1016/j.mssp.2019.02.027 -
N h tillid 1,0
“When 5%[AMIM]Cl-PFSA composite membranes was compared conversion rate is 1.5%, decomposition temperature of with PFSA membrane, resulting in a new peak vibration: cm-1 cm-1 triethylamine pretreated and the PFSA film distributed at 3410 is N”
Thermal stability and lifetime of [AMIM]Cl-PFSA composite membranes DOI: 10.1007/s10973-016-6065-7
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