Alkene (C=C) — FTIR-absorptions-toppe og tildelinger
Dette er de karakteristiske FTIR-bølgetal, hvor Alkene (C=C) har tendens til at absorbere, samlet fra offentliggjort litteratur og rangeret efter understøttende evidens. Hver tildeling kan spores til en kilde (DOI) og er krydsvalideret mod vores 320,000+ referencespektrer og vidensgraf.
Understøttet af 8 citerede kilder
Hurtigt svar
Alkene (C=C) tildeles normalt ved at lede efter en tilbagevendende klynge af karakteristiske toppe frem for et præcist lærebogsnummer. Tabellen nedenfor viser, hvor litteraturen oftest placerer denne gruppe i FTIR, rangeret efter akkumuleret evidens.
Karakteristiske FTIR-toppe for Alkene (C=C)
| Bølgetal (cm⁻¹) | Understøttende fakta | Citerede kilder | Højeste tillid |
|---|---|---|---|
| 1600 | 61 | 59 | 1,0 |
| 1640 | 39 | 37 | 1,0 |
| 1638 | 30 | 28 | 1,0 |
| 1650 | 29 | 27 | 1,0 |
| 1630 | 23 | 21 | 1,0 |
| 3010 | 22 | 20 | 1,0 |
| 1610 | 21 | 21 | 1,0 |
| 1635 | 21 | 20 | 1,0 |
| 1637 | 21 | 18 | 1,0 |
| 1500 | 20 | 19 | 1,0 |
| 1636 | 17 | 17 | 1,0 |
| 1608 | 16 | 15 | 1,0 |
| 1620 | 16 | 14 | 1,0 |
| 3008 | 15 | 14 | 1,0 |
| 1580 | 14 | 13 | 1,0 |
| 1625 | 13 | 13 | 1,0 |
| 1639 | 13 | 10 | 1,0 |
| 1560 | 12 | 12 | 1,0 |
| 3009 | 12 | 11 | 1,0 |
| 1700 | 12 | 11 | 1,0 |
| 1590 | 12 | 10 | 1,0 |
| 1634 | 11 | 11 | 1,0 |
| 1645 | 11 | 11 | 1,0 |
| 1514 | 11 | 10 | 1,0 |
| 1633 | 11 | 9 | 1,0 |
| 1655 | 10 | 10 | 1,0 |
| 1651 | 10 | 10 | 1,0 |
| 1450 | 10 | 10 | 1,0 |
| 1646 | 10 | 9 | 1,0 |
| 1618 | 10 | 9 | 1,0 |
Viser de 30 bedst understøttede toppe ud af 801 i alt for Alkene (C=C).
Spektrumlogik
En funktionel gruppetildeling bliver mere sikker, når flere forventede bånd optræder sammen. Brug denne side til at finde de bedst understøttede peaks, og bekræft derefter, at den samme prøve udviser et sammenhængende mønster snarere end et enkelt isoleret hit.
Anvendelse i virkeligheden
Disse sider er nyttige til analyse af ukendte materialer, topforklaring i rapporter, polymerfejlfinding og verifikation af, om en kandidatmaterialefamilie er kemisk plausibel.
Almindelige fejl
- Brug af én funktionel-gruppe-side som en komplet materialebedømmelse uden at kontrollere resten af spektret.
- Antager, at det stærkeste bånd altid er det mest diagnostiske.
- At glemme, at forarbejdning, tilsætningsstoffer, ældning og blandinger kan flytte eller udvide forventede toppe.
Verifikationsrådgivning
Brug DSC, GC-MS eller TGA, når flere materialefamilier deler lignende bånd, eller når blandings-effekter gør FTIR-tildelingen usikker.
Litteratur bag disse tildelinger
-
968 cm⁻¹ tillid 1,0
“and quantified by using Fourier-transform infrared (FTIR) spectroscopy, in the mid-region of 400-4000 cm-1, The FTIR analysis shows that two oil extracts (with and without heat) present a well-defined peak at 968 which represents the double”
Analysis of trans fatty acids production and squalene variation during amaranth oil extraction DOI: 10.2478/s11532-012-0104-4 -
1535 cm⁻¹ tillid 1,0
“As observed in the MWCNTs sample, a typical signal at 1535 shows the cm-1 C=C vibration of structural aromatic.”
Synthesis and Physical Properties Characterization of Montmorillonite-modified Carbon Nanotubes Filler DOI: 10.1088/1757-899X/546/4/042004 -
1643 cm⁻¹ tillid 1,0
“cm-1 peak at 1705.1 means that there is a bond of cm-1 -C=O, and also absorption at 1643.4 and medium intensity which shows the presence of C=C.”
Grafting of Oleic Acid On Cyclic Natural Rubber Resiprene-35 Using Dicumyl Peroxide Initiator and Divinylbenzene Compatibilizers For Paint Binder In Polyamide Thermoplastics DOI: 10.13005/ojc/350119 -
1645 cm⁻¹ tillid 1,0
“The small peak at 1645 is attributed to the stretching vibration of C=C [48], which becomes gradually stronger by increasing content of VMSG.”
Novel Silica Functionalized Monosodium Glutamate/PVA Cross-linked Membranes for Alkali Recovery by Diffusion Dialysis DOI: 10.21203/rs.3.rs-283846/v1 -
1634 cm⁻¹ tillid 1,0
“LLM confirmed rule peak-group candidate”
Modified Dioscorea hispida starch-based hydrogels and their in-vitro cytotoxicity study on small intestine cell line (FHS-74 Int) DOI: 10.1016/j.ijbiomac.2017.10.125 -
1634 cm⁻¹ tillid 1,0
“35 36 cm-1 The twin weak absorption bands at 1634 and 1613 are from C=C stretching vibration while the 37 cm-1 38 absorbances at 2847 and 2940 are attributed to the stretching vibration of aliphatic C-H groups.”
Electrosprayed PMMA microcapsules containing green soybean oil-based acrylated epoxy and a thiol: a novel resin for smart self-healing coatings DOI: 10.1088/1361-665X/ab9754 -
1578 cm⁻¹ tillid 1,0
“2 (bottom) cm-1, bands were located at 1578 that the highest signal-to-noise ratio was found for a resulting from the cm-1, nominal resolution of 4 C=C stretching in chloroalkenes, at 1541, 1394, 1273 which also provided the cm-1,”
Determination of iprodione in agrochemicals by infrared and Raman spectrometry DOI: 10.1007/s00216-007-1152-z -
3275 cm⁻¹ tillid 1,0
“The two prominent peaks at 3275.13 and 1635.54 are typical of N-H bond of amines and C=C stretch of alkenes or C=O stretch of amides [42] respectively.”
Biomedical Applications of Cocoa Bean Extract-Mediated Silver Nanoparticles as Antimicrobial, Larvicidal and Anticoagulant Agents DOI: 10.1007/s10876-016-1055-2
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