What absorbs at 1187 cm⁻¹ in an FTIR spectrum?
A band near 1187 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 1187 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 |
|---|---|---|---|
| Methacrylate | 6 | 6 | 1.0 |
| Acetate | 6 | 6 | 1.0 |
| Methoxy (OCH3) | 5 | 5 | 1.0 |
| C-O single bond | 5 | 5 | 1.0 |
| Secondary amine | 3 | 3 | 1.0 |
| Amide | 3 | 3 | 1.0 |
| C n single bond | 2 | 2 | 1.0 |
| N h | 2 | 2 | 1.0 |
| Ester | 2 | 2 | 1.0 |
| Amine primary | 1 | 1 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
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 |
|---|---|---|---|
| Nanocellulose | 1187, 1540, 1646 | Methacrylate, Acetate, C-O single bond | 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 1187 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
-
N h keyakinan 1.0
“that can be assigned to the NH Their observation of the absence of proton of E showed a band at 1187 bending vibration of a strongly hydrogen-bonded His and a release in the presence of o-phenanthroline, concomitant with cm-1 cm-1 band at 1”
Kimura 等 - 2020 - Protonation State of a Key Histidine Ligand in the DOI: 10.1021/acs.biochem.0c00810 -
Acetate keyakinan 1.0
“cm-1, cm-1), 2662 which characterize cyclic dimer, in-plane COH (1400 the CO bending vibrations cm-1) cm-1, (1714 and feature at 1700 which also characterizes the cyclic dimer, the COH bending cm-1 cm-1), (1400) and C-O stretching vibration”
Kondratenko 等 - 2020 - Thioglycolic Acid FTIR Spectra on Ag2S Quantum Dot DOI: 10.3390/ma13040909 -
Ester keyakinan 1.0
“cm-1 (1) EPMC due to the absorption at 1707 of the In this step, two amine compounds were used, namely cm-1 carbonyl ester strengthened by the band at 1186.86 phenethylamine and morpholine, to produce N-”
Rasyid 等 - 2022 - Synthesis of N-phenethyl-p-methoxycinnamamide and DOI: 10.22146/ijc.76802 -
Ester keyakinan 1.0
“and bands located between 1187 and 1277/cm that represented ester C=O vibrations.”
Biodegradation of P(3HB-co-4HB) powder by Pseudomonas mendocina for preparation low-molecular-mass P(3HB-co-4HB) DOI: 10.1007/s13205-017-0824-4 -
Acetate keyakinan 1.0
“The peaks at 1187 and 980 are 2 3 respectively attributed to the asymmetric stretching of C-O-C and the deformation of C=CH [43,44],”
Hosseini 等 - 2017 - Polymethacrylate Coated Electrospun PHB Fibers as DOI: 10.3390/s17102292 -
Amide keyakinan 1.0
“The -C-N band at wavenumbers 1187 and”
Preparation and Characterization of Indomethacin Supramolecular Systems with -Cyclodextrin in Order to Estimate Photostability Improvement DOI: 10.3390/molecules26247436 -
Siloxane (Si-O-Si) keyakinan 1.0
“Moreover, in the case of silane- -1 cm-1 samples, a peak at 1187 occurred and was attributed to the presence of siloxane”
APTES-Modified Nanocellulose as the Formaldehyde Scavenger for UF Adhesive-Bonded Particleboard and Strawboard DOI: 10.3390/polym14225037 -
Acetate keyakinan 1.0
“C-N, C-C and C-O stretching 1187 a 1015 A menu plot molecular graph, the electrostatic”
Rangel-Vazquez 等 - 2014 - Spectroscopy Analyses of PolyurethanePolyaniline DOI: 10.1590/0104-1428.1496
Ada spektrum dengan jalur ini?
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