What absorbs at 1243 cm⁻¹ in an FTIR spectrum?
A band near 1243 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 1243 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 |
|---|---|---|---|
| C-O single bond | 12 | 12 | 1.0 |
| Methoxy (OCH3) | 11 | 11 | 1.0 |
| Methacrylate | 11 | 11 | 1.0 |
| Acetate | 11 | 11 | 1.0 |
| Amide | 7 | 7 | 1.0 |
| Alkyl C-H | 6 | 6 | 1.0 |
| Secondary amine | 5 | 5 | 1.0 |
| C n single bond | 4 | 4 | 1.0 |
| Hydroxyl (O-H) | 3 | 3 | 1.0 |
| Phosphate (PO4) | 3 | 3 | 1.0 |
| Aromatic ring | 2 | 2 | 1.0 |
| N h | 2 | 2 | 1.0 |
| Ring structure | 2 | 2 | 1.0 |
| Carbonyl (C=O) | 2 | 2 | 1.0 |
| Ester | 2 | 2 | 1.0 |
| Carboxyl (COOH) | 2 | 2 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Nucleic acid | 1 | 1 | 1.0 |
| Phosphorus | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| Lignin | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Methyl | 1 | 1 | 1.0 |
| Phospholipid | 1 | 1 | 0.9 |
| Fluorine (C-F) | 1 | 1 | 0.7 |
Pemeringkatan mencerminkan bukti literatur terkumpul, bukan satu peraturan berwibawa. Sentiasa sahkan terhadap konteks sampel anda.
Bahan yang mungkin
| Bahan | Puncak sokongan | Kumpulan bertindih | Sumber dipetik |
|---|---|---|---|
| Cellulose | 1243, 1735, 1650 | Acetate, Methacrylate, C-O single bond | 1 |
| asphalt binder | 1243, 1700, 1242 | Methacrylate, Acetate | 1 |
Bahan hanya dipaparkan apabila kumpulan literatur yang sama menyokong jalur ini dan sekurang-kurangnya satu puncak ciri tambahan.
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 1243 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
“shoulder band at about The 1459 and 1384cm-1 bands are methyl bending signals and bands at 1243”
Font 等 - 2007 - Fourier transform infrared spectroscopy as a suita DOI: 10.1016/j.aca.2007.07.021 -
Acetate keyakinan 1.0
“The peak at wavelength The ratio of cellulose to concentration as a EFB AA cm-1 1243 is attributed to the stretching of and C-O C=O modified reagent played a significant role on the WPG deformation of the ester bond.”
Jahi 等 - 2020 - Empty Fruit Bunch Cellulose based Sorbent for Oil DOI: 10.17576/jsm-2020-4909-29 -
Alkyl C-H keyakinan 1.0
“(690-900 C-O (970-1250 and stretching A peak at cm-1 C-H 1243.26 may be assigned to bonding.”
Synthesis and characterization of a green‐light‐emitting (pbi‐Br)2Ir (acac) metal complex for OLEDs DOI: 10.1002/bio.3565 -
Acetate keyakinan 1.0
“However, peak at cm-1 1243 was absence upon acid hydrolysis due to the removal of C-O-C functional group of aryl-alkyl ether in 460 lignin [17].”
Kuthi 和 Badri - 2014 - Effect of Cooking Temperature on the Crystallinity DOI: 10.1063/1.4895240 -
Alkyl C-H keyakinan 1.0
“Related studies have confirmed that when EVA is added to a modified asphalt is peak-responsive in wavenumber of 1243 and 1740 by the combination of cm(cid:2879)(cid:2869) cm(cid:2879)(cid:2869) binder, it is peak-responsive in wavenumber of”
Analysis of the Properties of Modified Asphalt Binder by FTIR Method DOI: 10.3390/ma15165743 -
Amide keyakinan 1.0
“FTIR spectra Implants of FIB and HA-FIB films exhibited distinctive absorption maxima, in specific positions of FIB random MatrixAssistedPulsedLaserEvaporation 1540cm-1 1654cm-1 1243cm-1 1027cm-1 (MAPLE) coil form: amide II, amide I, amide”
Composite biocompatible hydroxyapatite⠍silk fibroin coatings for medical implants obtained by Matrix Assisted Pulsed Laser Evaporation DOI: 10.1016/j.mseb.2009.10.004 -
C-O single bond keyakinan 1.0
“and multiple CF band (1243, 1190, 800,and 748 From Figure 2 shows asymmetric stretching mode of ether funcFig.”
Radzir 等 - 2015 - Effect of lithium bis(trifluoromethylsulfonyl)imid DOI: 10.1007/s10008-015-2910-z -
Amide keyakinan 1.0
“purine = √ D L(cid:4)H (6) A0˛,A(cid:4)L(cid:4)˛(cid:4) A(cid:4)˛(cid:4) (cid:3) A˛, m Am cm-1 A(cid:4) The vibration at 1243 comes from the in-plane stretching of the C N bonds and the stretching and in-plane swinging of where”
A comparative study on the experimental and calculated results of mid-infrared and Raman vibrational modes of nucleic acid bases DOI: 10.1016/j.jmgm.2017.04.016
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