What absorbs at 3154 cm⁻¹ in an FTIR spectrum?
A band near 3154 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 7 cited sources
Hiter odgovor
A band near 3154 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 |
|---|---|---|---|
| Methoxy (OCH3) | 2 | 2 | 1,0 |
| Methacrylate | 2 | 2 | 1,0 |
| Acetate | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| C=n | 1 | 1 | 1,0 |
| Carbon dioxide | 1 | 1 | 1,0 |
| Aldehyde (CHO) | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Amine primary | 1 | 1 | 1,0 |
| N h | 1 | 1 | 0,9 |
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 |
|---|---|---|---|
| chitosan | 3154, 1650, 1655 | Acetate, Methacrylate, Hydroxyl (O-H) | 1 |
| Fe2O3 | 3154, 1130, 1631 | Hydroxyl (O-H), Methacrylate, Acetate | 1 |
| ZnO | 3154, 1400, 3430 | Hydroxyl (O-H), Acetate, Methacrylate | 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 3154 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
-
Amine primary zaupanje 1,0
“The broad absorption peak at 3154 is due to cm-1 symmetric stretching mode of -NH 2.”
Karuppannan 和 Prashantha - 2010 - Nano structured carbon nitrides prepared by chemic DOI: 10.1117/12.861609 -
Acetate zaupanje 1,0
“The band which appears at 3154 is attributed to ( = O - CH 3) double 265 37 38”
Misenan 等 - 2018 - Electrical and structural studies of polymer elect DOI: 10.1088/2053-1591/aac25b -
Hydroxyl (O-H) zaupanje 1,0
“As shown in Figure S4 (zoomed part), prominent cm-1 cm-1 O-H 1250 can be attributed to stretching, while bands are because of stretching bands at 1576, 1607, and 1628 cm-1 C-H are due to the stretching of at 2857 and 2924 vibrations of the”
Bir 等 - 2022 - Multifunctional Ternary NLPZnO@L-cysteine-grafted DOI: 10.1021/acsomega.2c04936 -
Carbon dioxide zaupanje 1,0
“The intense bands at 1642.79 cm-1 and 3153.55 cm-1 were then assigned to CO2 vibration and O-H vibrations, respectively, ratifying the presence of surface γ-Fe2O3 hydroxyl groups.”
Fauzi 等 - 2020 - Nanostructured ChitosanMaghemite Composites Thin DOI: 10.3390/polym12071497 -
C=n zaupanje 1,0
“1, showed NH stretching 8.33(cid:4), 18.5(cid:4), 19.78(cid:4), 23.5(cid:4) 28.08(cid:4) 2q ¼ peaks at and with limited cm(cid:3)1, vibration peak at 3154 while the imine stretching peak (011).37 planes at (010), (110) and cm(cid:3)1.”
Microwave-assisted facile synthesis of poly(luminol-co-phenylenediamine) copolymers and their potential application in biomedical imaging DOI: 10.1039/c8ra08373h -
N h zaupanje 0,9
“assigned to N-H stretching”
Adam 等 - 2022 - Comparative Evaluation of Amlodipine Besylate Gene DOI: 10.14227/DT290422PGC2 -
Hydroxyl (O-H) zaupanje 0,8
“attributed to -OH stretching”
Chiral Tartaric Acid Improves Fracture Toughness of Bioactive Brushite–Collagen Bone Cements DOI: 10.1021/acsabm.0c00555
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