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
Quick answer
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.
Iespējamie funkcionālo grupu piešķīrumi
| Funkcionālā grupa | Atbalstošie fakti | Citētie avoti | Augstākā pārliecība |
|---|---|---|---|
| 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 |
Rangs atspoguļo uzkrātos literatūras pierādījumus, nevis vienu autoritatīvu noteikumu. Vienmēr apstipriniet atbilstoši parauga kontekstam.
Possible materials
| Materiāls | Atbalstošie pīķi | Overlapping groups | Citētie avoti |
|---|---|---|---|
| Silica | 956, 1100, 1080 | Hydroxyl (O-H), Silanol (Si-OH) | 1 |
Materials are shown only when the same literature pool supports this band and at least one additional characteristic peak.
Spectrum logic
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.
Real-world usage
This type of query is common in polymer identification, unknown plastic screening, QC troubleshooting, recycled-material verification, and literature-backed peak assignment review.
Common mistakes
- Treating one isolated band as proof of a material without checking at least one or two supporting peaks.
- Ignoring overlap: multiple functional groups can contribute near the same wavenumber.
- Skipping validation when additives, blends, oxidation, or contamination may distort the spectrum.
Verification advice
When ambiguity remains, validate the hypothesis with DSC, GC-MS, or TGA, especially for blends, degraded samples, and filled polymers.
Literatūra aiz šiem piešķīrumiem
-
Silanol (Si-OH) pārliecība 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 -
pārliecība 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 pārliecība 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 pārliecība 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 pārliecība 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) pārliecība 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) pārliecība 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 pārliecība 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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