What absorbs at 1759 cm⁻¹ in an FTIR spectrum?
A band near 1759 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 1759 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 |
|---|---|---|---|
| Carbonyl (C=O) | 8 | 7 | 1,0 |
| Ester | 4 | 4 | 1,0 |
| Carboxyl (COOH) | 4 | 4 | 1,0 |
| Methacrylate | 3 | 3 | 1,0 |
| Ketone | 3 | 3 | 1,0 |
| Amide | 3 | 3 | 1,0 |
| Acetate | 3 | 3 | 1,0 |
| Fatty acid | 1 | 1 | 1,0 |
| Alkyl C-H | 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 |
|---|---|---|---|
| polymer | 1759, 1718, 1722 | Methacrylate, Carboxyl (COOH), Carbonyl (C=O) | 2 |
| chitosan | 1759, 1650, 1655 | Methacrylate | 1 |
| PLA | 1759, 1650, 1073 | Methacrylate, Carbonyl (C=O), Carboxyl (COOH) | 1 |
| plasma | 1759, 1656, 1650 | Carboxyl (COOH), Methacrylate | 1 |
| serum | 1759, 1656, 1122 | Ester, Methacrylate | 1 |
| poly(vinyl alcohol) | 1759, 1700, 2993 | Methacrylate, Carbonyl (C=O), Carboxyl (COOH) | 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 1759 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
-
Carbonyl (C=O) zaupanje 1,0
“¼ structure, an orthorhombic unit cell is proposed (a 10.31 Å, cm(cid:3)1, For PLLA, an ester carbonyl band appears at around 1759 b¼18.21Åandc¼9.00Å)containingsixchains.ThePLLAcomplex cm(cid:3)1.”
Influence of hydrolytic degradation on the surface properties of poly-5d/95l-lactide resorbable bone plates DOI: 10.1016/j.polymdegradstab.2011.04.020 -
Alkyl C-H zaupanje 1,0
“The OMMT, which permits easy absorption of water into the cm21 characteristic peaks at 2997, 2946, and 1877 are for polymer chains and activates the rate of degradation with CAO cm21 are for CH stretching, while 1759 and 1456 fungal growth”
Shimpi 等 - 2014 - Preparation, Characterization, and Biodegradation DOI: 10.1002/pc.22658 -
Ester zaupanje 1,0
“1115 cm-1 cm-1 (C=N (symmetric stretching P-O-C), 1034 (collagen), 1528 guanine, adenine, cytosine) and cm-1 (C=O 1759 ester group vibration of triglycerides).”
New approach to investigate Common Variable Immunodeficiency patients using spectrochemical analysis of blood DOI: 10.1038/s41598-019-43196-5 -
Carboxyl (COOH) zaupanje 1,0
“FTIR spectra showed the grafting of AA and MAA monomers onto LSH due to the lack of their carboxylic acid carbonyls bands at 1759 and”
Application of Vibrational Spectroscopic Techniques in the Study of the Natural Polysaccharides and Their Cross-Linking Process DOI: 10.3390/ijms24032630 -
Acetate zaupanje 1,0
“at position 1759 This band corresponds to the stretching vibrations of the C=O groups originating from”
The sex impact on the technological and chemical characteristics of meat derived from the Polish native chicken breed DOI: 10.1038/s41598-023-33430-6 -
Acetate zaupanje 1,0
“C-H stretching (alkyl) 2993 2982 C=O stretching (-COOester group) 1759 1745”
Li 等 - 2020 - The Impact of Reactive Ionic Liquids Addition on t DOI: 10.3390/polym12091958 -
Acetate zaupanje 1,0
“A peak at 1759 stems from C=O stretching dominantly governed by the core states in the conjugated π”
Structural, optical, and bioimaging characterization of carbon quantum dots solvothermally synthesized from o-phenylenediamine DOI: 10.3762/bjnano.14.17 -
Carbonyl (C=O) zaupanje 1,0
“Furthermore, another characteristic band is the carbonyl of polymers, which is presented for PBAT and PLA at 1710 cm-1 and 1759 cm-1, respectively.”
Poly(butylene adipate-co-terephthalate)/Poly(lactic acid) Polymeric Blends Electrospun with TiO2-R/Fe3O4 for Pollutant Photodegradation DOI: 10.3390/polym15030762
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.