What absorbs at 2863 cm⁻¹ in an FTIR spectrum?
A band near 2863 cm⁻¹ can point to several functional groups. Below are the most likely assignments, ranked by how much published evidence supports each — every one traceable to literature (DOI) and cross-validated against our 130,000+ reference spectra and knowledge graph.
Backed by 5 cited sources
Hiter odgovor
A band near 2863 cm⁻¹ is usually interpreted by checking which functional groups repeatedly co-occur there in the literature, then confirming at least one or two additional peaks in the same sample. This page ranks those assignments by accumulated evidence rather than by a single fixed textbook rule.
Možne dodelitve funkcionalnih skupin
| Funkcionalna skupina | Podporna dejstva | Citirani viri | Najvišje zaupanje |
|---|---|---|---|
| Alkyl C-H | 3 | 3 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
Razvrstitev odraža zbrane literaturne dokaze, ne enega avtoritativnega pravila. Vedno preverite glede na kontekst vašega vzorca.
Možni materiali
| Material | Podporni vrhovi | Prekrivajoče se skupine | Citirani viri |
|---|---|---|---|
| CuO | 2863, 453, 1000 | Hydroxyl (O-H), Methoxy (OCH3) | 1 |
| chitosan | 2863, 1650, 1655 | Alkyl C-H, Hydroxyl (O-H), Methoxy (OCH3) | 1 |
Materiali so prikazani le, ko ista literaturna podlaga podpira ta pas in vsaj en dodatni karakteristični vrh.
Logika spektra
This band becomes meaningful only when read with its neighboring peaks. In practice, analysts first look at the assignments above, then check whether the same sample also shows other peaks expected for the same structural motif. A lone band near 2863 cm⁻¹ is usually not enough for material identification by itself.
Uporaba v resničnem svetu
Ta vrsta poizvedbe je pogosta pri identifikaciji polimerov, pregledovanju neznanih plastičnih mas, odpravljanju težav pri QC, preverjanju recikliranih materialov in literaturno podprtem pregledu dodelitev vrhov.
Pogoste napake
- Obravnavanje enega izoliranega pasu kot dokaza o materialu brez preverjanja vsaj enega ali dveh podpornih vrhov.
- Ignoriranje prekrivanja: več funkcionalnih skupin lahko prispeva blizu istega valovnega števila.
- Izpuščanje validacije, ko lahko dodatki, mešanice, oksidacija ali kontaminacija popačijo spekter.
Nasvet za preverjanje
Ko ostaja dvoumnost, potrdite hipotezo z DSC, GC-MS ali TGA, zlasti za mešanice, degradirane vzorce in polnjene polimere.
Literatura za temi dodelitvami
-
Alkyl C-H zaupanje 1,0
“Medium to strong intensity of Total 6, 0, 1 and 5 peaks were obtained in these regions C-H stretching vibrations resulted in two peaks at 2862.54 respectively.”
Chaudhari 等 - 2015 - Fourier transform infrared analysis of Tamra Bhasm DOI: 10.4103/0974-8520.169013 -
Alkyl C-H zaupanje 1,0
“2018) cm-1 consists in a high temperature treatment of ores and alloys, attributable to the C-H stretching 2933, 2891 and 2863 cm-1 that is meant to separate noble metals, such as gold and silver, of CH and CH groups, the strong band at 173”
The combined use of SEM-EDX, Raman, ATR-FTIR and visible reflectance techniques for the characterisation of Roman wall painting pigments from Monte d’Oro area (Rome): an insight into red, yellow and pink shades DOI: 10.1007/s11356-021-15085-w -
Carbohydrate zaupanje 1,0
“Also peaks 2863cm-1 represent the asymmetric and symmetric stretchfrom 3.3 to 3.9ppm correspond to protons of glucose amine 2and -CH 3, respectively, ing vibrations of the -CH in chitosan [15].”
Naghibzadeh 等 - 2010 - An Insight into the Interactions between alpha-Toc DOI: 10.1155/2010/818717 -
Hydroxyl (O-H) zaupanje 1,0
“2021, 68, 945-954 949 cm-1 at 1639.76 may be attributed to the bending vibration modes of O-H groups of these adsorbed H 2O molecules.49 Further, three small bands at 2862.62, 2928.94, cm-1 may be ascribed to the asymmetric and and 2959.97”
Shojaei 和 Komsari - 2021 - Synthesis of CuO by Electrospinning Method for Sen DOI: 10.17344/acsi.2021.6914 -
zaupanje 0,5
“Text: 'bands at 2863 and 2931' without assignment”
Alipour 等 - 2022 - The Effect of Vitamin C-Loaded Electrospun Polycap DOI: 10.21203/rs.3.rs-1587404/v1
Imate spekter s tem pasom?
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