What absorbs at 1518 cm⁻¹ in an FTIR spectrum?
A band near 1518 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
Jawapan pantas
A band near 1518 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.
Penetapan kumpulan berfungsi yang mungkin
| Kumpulan berfungsi | Fakta sokongan | Sumber dipetik | Keyakinan tertinggi |
|---|---|---|---|
| Amide | 7 | 7 | 1.0 |
| Aromatic ring | 5 | 4 | 1.0 |
| Alkene (C=C) | 4 | 4 | 1.0 |
| Alkyl C-H | 4 | 4 | 1.0 |
| Methacrylate | 3 | 3 | 1.0 |
| C-O single bond | 3 | 3 | 1.0 |
| Acetate | 3 | 3 | 1.0 |
| Protein beta sheet | 2 | 2 | 1.0 |
| N h | 2 | 2 | 1.0 |
| Methoxy (OCH3) | 2 | 2 | 1.0 |
| C c single bond | 2 | 2 | 1.0 |
| Protein | 2 | 1 | 1.0 |
| N-O bond | 2 | 1 | 1.0 |
| Carbonyl (C=O) | 2 | 1 | 1.0 |
| Protein alpha helix | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Phosphate (PO4) | 1 | 1 | 1.0 |
| Nitro (NO2) | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
Pemeringkatan mencerminkan bukti literatur terkumpul, bukan satu peraturan berwibawa. Sentiasa sahkan terhadap konteks sampel anda.
Logik spektrum
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 1518 cm⁻¹ is usually not enough for material identification by itself.
Penggunaan dunia sebenar
Jenis pertanyaan ini biasa dalam pengenalpastian polimer, saringan plastik tidak diketahui, penyelesaian masalah QC, pengesahan bahan kitar semula, dan semakan tugasan puncak yang disokong oleh literatur.
Kesilapan biasa
- Menganggap satu jalur terpencil sebagai bukti bahan tanpa memeriksa sekurang-kurangnya satu atau dua puncak sokongan.
- Mengabaikan pertindihan: pelbagai kumpulan berfungsi boleh menyumbang berhampiran nombor gelombang yang sama.
- Melangkau pengesahan apabila bahan tambahan, campuran, pengoksidaan, atau pencemaran boleh memesongkan spektrum.
Nasihat pengesahan
Apabila kekaburan masih ada, sahkan hipotesis dengan DSC, GC-MS, atau TGA, terutamanya untuk campuran, sampel terdegradasi, dan polimer terisi.
Literatur di sebalik penetapan ini
-
Alkyl C-H keyakinan 1.0
“The band at 1518 is generally ascribed to cm-1 C-H bending vibration and the band at 1030 assigned to C-O stretching of acetyl groups present in PVA.”
Devi 等 - 2019 - Structural and optical studies on PVA capped SnS f DOI: 10.1088/1674-4926/40/5/052101 -
Protein keyakinan 1.0
“A which are characteristic of proteins were observed with a maximum at around 1634 and 1518 cm-1, cm-1) which are indicative of the amide I band (1750-1600 and amide II band (1550-1510 cm-1), respectively.”
Rafe 和 Razavi - 2015 - Effect of Thermal Treatment on Chemical Structure DOI: 10.1080/10942912.2014.999864 -
Aromatic ring keyakinan 1.0
“theae (PT) is phylogenetically related to 3deformations)andemercm(cid:1)1 (CAH Pestalotiopsis, which has been reported to decolourize raw textile gence of peaks at 1518.20 bending in aromatic ring)”
Decolourization of malachite green dye by endolichenic fungi from the lichen Usnea sp.: A novel study on their dye removal potential DOI: 10.1016/j.jksus.2021.101579 -
keyakinan 1.0
“Since the color of melanin is resulted 184 from the absorption of light by electrons of chromophores (dihydroxyindole units in the 185 cm-1 eumelanin), stronger peak at 1518 of the N-H and C-N bands of SI melanin explains the N”
Isolation and characterization of melanin from black garlic and sepia ink DOI: 10.1016/j.lwt.2018.09.033 -
C c single bond keyakinan 1.0
“and (iv) the appearance of two IR bands According to Figure 5, the IR spectrum of protein G is dominated by two IR bands with maxima at 1699 and 1780 cm-1, both assigned to the C=O vibrational mode whose cm-1, at 1518 and 1634 which were as”
Optical Evidence for the Assembly of Sensors Based on Reduced Graphene Oxide and Polydiphenylamine for the Detection of Epidermal Growth Factor Receptor DOI: 10.3390/coatings11020258 -
C c single bond keyakinan 1.0
“C = O stretch, O7-H22 bend, and ring A C-C stretch at 1518 cm-1 cm-1, and 1518 Table 1 presents the relative absorbances in the SC layers at 1652 which correspond to the amounts of GEN that penetrated into the SC after conventional and”
Balazs 等 - 2016 - ATR-FTIR and Raman spectroscopic investigation of DOI: 10.1364/BOE.7.000067 -
Alkene (C=C) keyakinan 1.0
“Weak band near 1518 our results of DPPH assay obtained for methanolic arose from C=C stretching vibrations of phenoextracts.”
Morphology, physicochemical properties and antioxidant capacity of bee pollens DOI: 10.17221/139/2018-CJFS -
Hydroxyl (O-H) keyakinan 1.0
“The hydroxyl groups bending vibrations exist at 1518 cm-1 and 1750 [34].”
Kinetics of Dehydroxylation and Decarburization of Coal Series Kaolinite during Calcination: A Novel Kinetic Method Based on Gaseous Products DOI: 10.3390/ma14061493
Ada spektrum dengan jalur ini?
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