What absorbs at 3680 cm⁻¹ in an FTIR spectrum?
A band near 3680 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 3680 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 |
|---|---|---|---|
| Hydroxyl (O-H) | 8 | 7 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Hydrogen bond | 1 | 1 | 1.0 |
| Acetate | 1 | 1 | 0.8 |
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 |
|---|---|---|---|
| polyurethane | 3680, 2270, 1700 | N h | 1 |
| TiO2 | 3680, 1700, 1093 | Hydroxyl (O-H), Carboxyl (COOH) | 1 |
| water | 3680, 1018, 2945 | Hydroxyl (O-H), Water (H2O) | 1 |
| zirconia | 3680, 1100, 460 | Hydroxyl (O-H), Carboxyl (COOH), Water (H2O) | 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 3680 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
“The double peaks at 3680 cm-1 and 3633 cm-1 were observed due to the stretching vibration of the hydroxyl group at the surface of HNTs.”
Synthesis and Optimization of Superhydrophilic-Superoleophobic Chitosan–Silica/HNT Nanocomposite Coating for Oil–Water Separation Using Response Surface Methodology DOI: 10.3390/nano12203673 -
keyakinan 1.0
“The group of peaks from 3680 cm-1 to 3482 cm-1 intense spectral features at 938 and 3680 cm-1 correspond to the position of peaks that arise from OHstretching modes, where OHgroups are bound to Mg (serpentine and stitchtite) or Cr (stitchti”
Melchiorre 等 - 2020 - Insights on Structure and Threshold Detection Limi DOI: 10.3390/min10030215 -
Hydroxyl (O-H) keyakinan 1.0
“spectra with similar features in this region, in addition to a free Figure 2c shows the probability of a water molecule forming cm-1.22,25,95 cm-1 ∼3680 The 3200 peak has been OH stretch at a particular number of hydrogen bonds within the d”
Moussa 等 - 2009 - Experimental and Theoretical Characterization of A DOI: 10.1021/jp808710n -
Hydroxyl (O-H) keyakinan 1.0
“The vibrational bands at between between 3680 cm-1 and 3120 cm-1 are due to O-H and N-H stretching and can be attributed to cm-1 cm-1 between 3680 cm-1 and 3120 cm-1 are due to O-H and N-H stretching and can be attributed to 3680 and 3120 a”
Self-Healable Supramolecular Vanadium Pentoxide Reinforced Polydimethylsiloxane-Graft- Polyurethane Composites DOI: 10.3390/polym11010041 -
Hydroxyl (O-H) keyakinan 1.0
“CO stretching asym CaCO3 cm-1, 1050-1015 SO stretching Ca(SO4)·2H2O An intense band, between 3680 and 3000 is related to the OH stretchings of celcm-1 870-880 CO stretching asym CaCO3 lulose [46] and absorbed water, while the bending of thi”
Water-Based Aerosol for Book Deacidification: Experimental Apparatus and Theoretical Interpretation of Results DOI: 10.3390/molecules26144249 -
Hydroxyl (O-H) keyakinan 1.0
“The band of isolated OH groups at 3772 disappeared nearly completely, whereas the intensity of the cm1 hydroxyl stretch vibration band at 3680 decreased”
Adsorption and Reaction of CO on (Pd–)Al2O3 and (Pd–)ZrO2: Vibrational Spectroscopy of Carbonate Formation DOI: 10.1007/s11244-017-0852-7 -
Hydroxyl (O-H) keyakinan 1.0
“The results are presented in Table 2 that spectra of feedstock mainly possess peaks at around 3680cm-1 cm-1 O-H lignin, 1 3000 are assigned to stretching from peaks around 3000-2800 represent the C-H stretching 3 D cm-1”
Jaruwat 等 - 2018 - Effects of Hydrothermal Temperature and Time of Hy DOI: 10.1063/1.5053192 -
Hydroxyl (O-H) keyakinan 1.0
“This spectrum Scientific), low-temperature chamber (Harrick evacuated to the lowest (3725cm-1, exhibits IR bands of surface hydroxyls of anatase (ca.<10-3mbar) stable pressure and kept under dynamic vacuum for 3632cm-1) (3680cm-1, 3414cm-1)”
Litke 等 - 2019 - Interfacial charge transfer in Pt-loaded TiO2 P25 DOI: 10.1016/j.jphotochem.2018.10.023
Ada spektrum dengan jalur ini?
Muat naik spektrum FTIR anda dan dapatkan laporan tafsiran penuh — penetapan puncak dengan petikan literatur, padanan perpustakaan, dan rantaian bukti berkadar keyakinan — dalam beberapa saat.