What absorbs at 775 cm⁻¹ in an FTIR spectrum?
A band near 775 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 775 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 |
|---|---|---|---|
| Alkyl C-H | 4 | 4 | 1.0 |
| Amide | 3 | 3 | 1.0 |
| Aromatic ring | 2 | 2 | 1.0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1.0 |
| Methacrylate | 2 | 2 | 1.0 |
| Acetate | 2 | 2 | 1.0 |
| Silicon (Si) | 2 | 1 | 1.0 |
| Thiocarbonyl | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Methoxy (OCH3) | 1 | 1 | 1.0 |
| C-O single bond | 1 | 1 | 1.0 |
| Ring structure | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| Phosphate (PO4) | 1 | 1 | 1.0 |
| Chlorine | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Ester | 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 |
|---|---|---|---|
| silver nanoparticles | 775, 1636, 1631 | Alkyl C-H, Amide | 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 775 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
-
Acetate keyakinan 1.0
“TC-DO at 1412 and 779 W-DM had characteristic peaks at 1723 (C=O vibration), 1514, cm-1 corresponding to the characteristic peaks of TC-DM at 1643, 1465, 1413, 1456, 1422 and 775 cm-1.”
Discrimination and similarity evaluation of tissue-cultured and wild Dendrobium species using Fourier Transform Infrared Spectroscopy DOI: 10.1016/j.molstruc.2015.01.027 -
keyakinan 1.0
“6 FTIR spectra for a b c and of SPEs 16:2251-2260 2258 J Solid State Electrochem (2012) cm-1 8.0×10-8 cm-1 C-Cl functional group of stretching at 775 for aliphatS is obtained at 15% wt.”
Lee 等 - 2012 - Temperature dependence of the conductivity of plas DOI: 10.1007/s10008-011-1633-z -
Phosphate (PO4) keyakinan 1.0
“In the metaphosphate 775cm-1, (P-O-P) and (P-O-P) bands at about 900 and glass composition, CuO primarily acts as network modias s 43Q2 groups respectively, and the deformation modes of PO fier to depolymerize phosphate chain, until all the”
Shih 等 - 2003 - P-31 MAS-NMR and FTIR analyses on the structure of DOI: 10.1016/S0254-0584(03)00098-1 -
Alkene (C=C) keyakinan 1.0
“1624 Strong (methyne) 775 Medium Alkenyl C=C stretch Olefinic alkene 1458 Medium C=C-C aromatic ring stretch 775 Medium Alkenyl C=C stretch”
The Antimicrobial Activities of Silver Nanoparticles from Aqueous Extract of Grape Seeds against Pathogenic Bacteria and Fungi DOI: 10.3390/molecules26196081 -
Amide keyakinan 1.0
“The third (1239 and fourth cm-1) (775 amide band can be clearly seen only for PSi0, because in the PSi samples those bands are overlapped by the stronger aforementioned bands”
Thermal and surface properties of hybrid materials obtained from epoxy-functional urethane and siloxane DOI: 10.1007/s00289-015-1545-7 -
Acetate keyakinan 1.0
“(C-H 3308 stretching vibration), 2933 stretching of CH2 group), recorded in native nanocomposite components, were assigned corre- - O-H C-H 1602 (COOH stretching), 1429 (uronic acid (COOH)), 1018 825 sponding to stretching vibration at 3292”
Green decoration of graphene oxide Nano sheets with gelatin and gum Arabic for targeted delivery of doxorubicin DOI: 10.1016/j.btre.2022.e00722 -
Amide keyakinan 1.0
“a major peak has appeared at 775 These peaks were characteristic of C-N stretch (amines), =C-H bend (benzene, alkenes), and C-C (chlorides).”
Potential of Suaeda nudiflora and Suaeda fruticosa to Adapt to High Salinity Conditions DOI: 10.3390/horticulturae9010074 -
Thiocarbonyl keyakinan 1.0
“The following inference are made from the Cd2+, concentration of free as much of these ions would be in cm-1 found for pure observed FTIR results,The band at 775 42complex and most of the allylthiourea the form of CdCl Allylthiourea is assi”
Perumal 等 - 2023 - Influence of pH on the Growth of Tris-Allylthioure DOI: 10.14447/jnmes.v26i2.a07
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