What absorbs at 956 cm⁻¹ in an FTIR spectrum?
A band near 956 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 956 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) | 6 | 6 | 1.0 |
| Phosphate (PO4) | 4 | 4 | 1.0 |
| Silanol (Si-OH) | 3 | 3 | 1.0 |
| C-O single bond | 3 | 2 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Metal oxygen | 1 | 1 | 1.0 |
| Methoxy (OCH3) | 1 | 1 | 1.0 |
| Methacrylate | 1 | 1 | 1.0 |
| Acetate | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| Chlorine | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Metal oxo | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 0.9 |
| Aromatic ring | 1 | 1 | 0.8 |
| N h | 1 | 0 | 1.0 |
| Silicon-oxygen (Si-O) | 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 |
|---|---|---|---|
| Silica | 956, 1100, 1080 | Hydroxyl (O-H), Silanol (Si-OH) | 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 956 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
-
Silanol (Si-OH) keyakinan 1.0
“The IR band at 956 cm-1 can be assigned to silanol groups [56].”
Ultra-fine beta SiC nanowires Isothermally converted from high activated silica by Carbothermic Reduction and Carburization at low temperature DOI: 10.1016/j.matchemphys.2020.123716 -
keyakinan 1.0
“(cid:3)C ferences and endothermic peaks at 956 showing the presence of Ag.”
Lakshmanamoorthy 和 Manivannan - 2022 - Ionic liquids assist synthesis of AgAgX (X = Cl, DOI: 10.1007/s10854-021-06774-w -
Metal oxo keyakinan 1.0
“Explicitly stated: 'peaks at 1003 and 956 assigned respectively to V5+=O and V4+=O'”
Nagaraju - 2013 - Ultra Long Single Crystalline Na0.3V2O5 Nanofibers DOI: 10.5935/0103-5053.20130213 -
C c single bond keyakinan 1.0
“N-C-C Ch+ DES, the amine species of and bending at 956 and HBD show stronger vibrations at 1057 Zhang et al.”
Banjare 等 - 2020 - Micellization Behavior of Conventional Cationic Su DOI: 10.1021/acsomega.0c00866 -
Chlorine keyakinan 1.0
“1916 [30] 3 cm-1 956 B-Cl stretching”
Understanding the CVD process of (Si)–B–C ceramics through FTIR spectroscopy gas phase analysis DOI: 10.1016/j.surfcoat.2007.01.039 -
Hydroxyl (O-H) keyakinan 1.0
“The strongest symmetric stretch mode of PO is situated cm-1 cm-1 at 956 and the O-H stretch can be found at ~3567 [31].”
Gao 等 - 2019 - Preparation and Characterization of Biomimetic Hyd DOI: 10.3390/nano9020241 -
Silicon (Si) keyakinan 1.0
“The shoulder at 956 cm-1 indicates the existence of the Si-OH stretching band [33].”
Investigation on Water Vapor Adsorption of Silica-Phosphonium Ionic Liquids Hybrid Material DOI: 10.3390/ma12111782 -
Acetate keyakinan 1.0
“and also negatively correlated with the increase in the band intensity at 956 1152 and 1110 cm-1 This suggests that the 956 band is associated with the C-O stretching mode of primary alcohols”
Recent Progress in Fourier Transform Infrared (FTIR) Spectroscopy Study of Compositional, Structural and Physical Attributes of Developmental Cotton Fibers DOI: 10.3390/ma6010299
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