What absorbs at 3226 cm⁻¹ in an FTIR spectrum?
A band near 3226 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 7 cited sources
Jawapan pantas
A band near 3226 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 |
|---|---|---|---|
| N h | 5 | 5 | 1.0 |
| Hydroxyl (O-H) | 2 | 2 | 1.0 |
| Secondary amine | 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 |
|---|---|---|---|
| starch | 3226, 1650, 1540 | Hydroxyl (O-H) | 1 |
| TiO2 | 3226, 1700, 1093 | Hydroxyl (O-H) | 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 3226 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
-
keyakinan 1.0
“cm-1 However, Figure 2(b) shows a peak at 3226 corresponding to N-H of polyaniline as well as 1666”
Burhan 等 - 2020 - Preparation of Cyperus diffusus Vahl cellulose-pol DOI: 10.1088/1757-899X/833/1/012063 -
Hydroxyl (O-H) keyakinan 1.0
“The peak centered at 3226 coincides with the OH stretching band of choline chloride and thus it is attributed to the hydrogen bonding between the hydroxyl group of choline ions and the chloride ions (Perkins, Painter et al.”
Ternary Natural Deep Eutectic Solvent (NADES) Infused Phthaloyl Starch as Cost Efficient Quasi-Solid Gel Polymer Electrolyte DOI: 10.1016/j.carbpol.2017.03.023 -
keyakinan 1.0
“molecule has both carbonyl bonds which also another forked absorption band at about 3334.22 and cm-1 can act as a strong hydrogen acceptor as well as (N-H) bond 3226.23 corresponding to the stretching vibration of”
An Intragastric Delivery Device Employing FDM Technology: 3D-Printed Tablet Containing Green Developed Mosapride-Saccharin Co-crystals DOI: 10.1208/s12249-023-02578-9 -
keyakinan 1.0
“Bands attributed cm-1 to N-H stretching vibration can be observed at 3226, 3247, 3261, and 3234 for P1, P2, P3, and P4 respectively.”
Comparison of Different Methods for Spongin-like Collagen Extraction from Marine Sponges (Chondrilla caribensis and Aplysina fulva): Physicochemical Properties and In Vitro Biological Analysis DOI: 10.3390/membranes11070522 -
N h keyakinan 1.0
“Also it has been shown a change in the NH stretching absorption of cm-1 ∼3226 amines [13];”
Kacso 等 - 2012 - Structural characterization of ambazone salt with DOI: 10.3233/SPE-2012-0570 -
Hydroxyl (O-H) keyakinan 1.0
“LLM confirmed rule peak-group candidate”
Mino 等 - 2016 - A surface science approach to TiO2 P25 photocataly DOI: 10.1016/j.apcatb.2016.05.029 -
N h keyakinan 0.9
“Part of the range 3326–3226.”
Lin 等 - 2017 - SYNTHESIS AND BIOLOGICAL ACTIVITIES OF 3,6-DISUBST DOI: 10.4314/bcse.v31i3.12
Ada spektrum dengan jalur ini?
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