What absorbs at 741 cm⁻¹ in an FTIR spectrum?
A band near 741 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 8 cited sources
Hiter odgovor
A band near 741 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 |
| Aromatic ring | 3 | 2 | 1,0 |
| Ring structure | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| C-O single bond | 2 | 2 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 0 | 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 |
|---|---|---|---|
| soil | 741, 575, 1240 | Hydroxyl (O-H), Alkyl C-H | 1 |
| nanoparticles | 741, 1732, 1647 | Alkyl C-H, Hydroxyl (O-H) | 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 741 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
“cm-1 (carboxylic acid), 1599 (aromatic C C bending and stretchcm-1 cm-1 ing), 1459 (C H bend), 1382 ( OH bending and C O cm-1 stretching of carboxylic acid), 741 and 756 (1,2-disubstituted ring vibrations), respectively.”
Telmisartan complex augments solubility, dissolution and drug delivery in prostate cancer cells DOI: 10.1016/j.carbpol.2013.09.077 -
Alkyl C-H zaupanje 1,0
“Peaks at (741,697 cm-1) and (598 cm-1) corresponds to CH bending and C-OH bending respectively.”
Kumar 等 - 2021 - Centella asiatica mediated facile green synthesis DOI: 10.1016/j.inoche.2021.108865 -
zaupanje 1,0
“cm(cid:2)1 cm(cid:2)1 peaks of OH, 957 and 1035 are the inside and minerals dispersed in alkaline pH due to the strong electrocm(cid:2)1 outside bending and vibrating peaks of OH, 741 is static repulsion among mineral particles caused by th”
Yu-hua 等 - 2008 - Beneficiation of diasporic-bauxite ore by selectiv DOI: 10.1016/j.mineng.2008.01.001 -
N h zaupanje 1,0
“Assigned Vibrations 741 702 NH bending and CH bending from aminophenyl radicals 2 801 749”
Spectroscopic Investigations of Porphyrin-TiO2 Nanoparticles Complexes DOI: 10.3390/molecules28010318 -
Ring structure zaupanje 1,0
“832.22 - 833 Ring vibration 741.45 785.25”
Rahmawati 等 - 2022 - Effect of Sterilization on the Degree of Esterific DOI: 10.17576/jsm-2022-5111-13 -
Alkyl C-H zaupanje 1,0
“group are seen at 1504 and 1392 and the characteristic C-H vibration of the benzene ring at 741 In the cm-1 inset A of Fig.”
Iron-Terephthalate Coordination Network Thin Films Through In-Situ Atomic/Molecular Layer Deposition DOI: 10.1038/s41598-018-27124-7 -
zaupanje 0,9
“Explicit assignment.”
Nadeem 等 - 2022 - Stability Analysis of Fe3O4-OA-MWCNT Nanocomposite DOI: 10.1155/2022/1859698 -
zaupanje 0,9
“Distinct vibration band at 741 cm-1 identifies dolomite.”
Shafiquzzaman 等 - 2022 - Sawdust Recycling in the Development of Permeable DOI: 10.3390/su141811115
Imate spekter s tem pasom?
Naložite svoj FTIR spekter in v nekaj sekundah pridobite celotno poročilo o interpretaciji — dodelitve vrhov z literaturnimi citati, ujemanja knjižnice in verigo dokazov z oceno zaupanja.