What absorbs at 1694 cm⁻¹ in an FTIR spectrum?
A band near 1694 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 1694 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 | 5 | 3 | 1.0 |
| Carbonyl (C=O) | 3 | 3 | 1.0 |
| Carboxyl (COOH) | 3 | 3 | 1.0 |
| Hydroxyl (O-H) | 2 | 2 | 1.0 |
| Carbonate | 1 | 1 | 1.0 |
| Protein beta turn | 1 | 1 | 1.0 |
| Protein alpha helix | 1 | 1 | 1.0 |
| Protein | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| Methacrylate | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Acetate | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| N-O bond | 1 | 0 | 1.0 |
| Urethane | 1 | 0 | 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 |
|---|---|---|---|
| chitosan | 1694, 1650, 1655 | Amide, Hydroxyl (O-H) | 1 |
| protein | 1694, 1650, 1640 | Amide, Carbonyl (C=O), Carboxyl (COOH) | 1 |
| magnetite | 1694, 1740, 1263 | Hydroxyl (O-H), Carboxyl (COOH) | 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 1694 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
-
Hydroxyl (O-H) keyakinan 1.0
“Peak of TLE was broad and strong occurred at 3261 as -OH group vibration, 1694 as max cm-1 cm-1 C=O group, 1359 as -NH group, and 1056 as C-O group.”
A facile method for green synthesis of Nd2O3 nanoparticles using aqueous extract of Terminalia catappa leaf DOI: 10.1063/1.5064090 -
Alkyl C-H keyakinan 1.0
“The absorption peak located at 232 cm-1 cm-1 1694 corresponds to C =O stretching of alkanes.”
Antibacterial, antibiofilm and cytotoxic effects of Nigella sativa essential oil coated gold nanoparticles DOI: 10.1016/j.micpath.2015.11.021 -
Acetate keyakinan 1.0
“In the absorption spectrum of the C=O stretching (1694 which indicates the oxidation”
Potential effects of nano-cellulose and nano-silica/polyvinyl alcohol nanocomposites in the strengthening of dyed paper manuscripts with madder: an experimental study DOI: 10.1038/s41598-022-23907-1 -
Protein keyakinan 1.0
“was also found, of lower intensity 1628 cm-1 II band around 1545 cm-1 (Figure 1 and Figure cal of protein aggregates, and by the upshift of and broader compared to the prefixation stage, 2 A,B,C), the absorption of proteins dominates the 16”
Ami 等 - 2014 - Role of water in chromosome spreading and swelling DOI: 10.4081/ejh.2014.2330 -
Carboxyl (COOH) keyakinan 1.0
“of the methyl and methylene group at 2880 and 2935 cm-1 The sharp band at 1694 assigns to stretching vibration The saturated adsorbent with oil was filtered in a vacuum (C = O) of carboxylic acid.”
Eco-friendly adsorbents based on abietic acid, boswellic acid, and chitosan/magnetite for removing waste oil from the surface of the water DOI: 10.1007/s11356-022-20169-2 -
Protein alpha helix keyakinan 1.0
“(β-sheets), (α-helix/ Teknoloji peaks at 1694 tion proteins during Similar results were also 1680 (turn/loop), 1647 cm-1 (α-helix)”
Guler 等 - 2019 - Characterization of CD133(+)CD44(+) human prostat DOI: 10.1039/c9an00093c -
Hydroxyl (O-H) keyakinan 1.0
“1 the vibrational peaks of MnO found at 1694 1533 1385 987 2 cm1 cm1 corresponds to -OH bending vibrations complexed with Mn atoms and those around 684 and”
Helen 等 - 2023 - Amelioration of ionic conductivity (303 K) with th DOI: 10.21203/rs.3.rs-1557220/v1 -
Amide keyakinan 1.0
“Particularly, a down-shift from 1666 shifts to For Xano bound spectra we also amide-I 1656cm-1 7cm-1 1694cm-1 Asn4046.52 to observed a of amide-I band upon binding of ACh points to an up shift in signal to and”
Vibrational spectroscopy analysis of ligand efficacy in human M2 muscarinic acetylcholine receptor (M2R) DOI: 10.1038/s42003-021-02836-1
Ada spektrum dengan jalur ini?
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