What absorbs at 949 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 949 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.

可能的官能团归属

排名反映了累积的文献证据，而非单一的权威规则。请始终对照您的样品背景进行确认。

Possible materials

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 949 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.

这些分配背后的文献

• Silicon (Si) 置信度 1.0

  “The weak bands at 900 cm-1 and 949 cm-1 are possibly atattributed to the symmetric stretching vibrations Si-OH and Si-O-Si in amorphous silica.”

  Biosynthesized Silica Nanosuspension as Thermal Fluid in Parabolic Solar Panels DOI: 10.3390/e23020142
• Alkene (C=C) 置信度 1.0

  “stretching (1066 -CH-O-CHstretching (1003 and =C-H bending (949 cm-1) and = C-H bending (949 cm-1).”

  Substantial Proton Ion Conduction in Methylcellulose/Pectin/Ammonium Chloride Based Solid Nanocomposite Polymer Electrolytes: Effect of ZnO Nanofiller DOI: 10.3390/membranes12070706
• C c single bond 置信度 1.0

  “Furthermore, the cm-1 band at 1081 and 1025 is assigned for the stretching of C-O-C group, however, C-C-H stretching, C-O-C glycosidic linkage (ring breathing), and -C-C (C-C-O ring) could be associated with the peak of 949, 887, and 814 cm”

  Faried 等 - 2017 - Green Synthesis of Silver Nanoparticles in Biopoly DOI: 10.1063/1.4968377
• Hydroxyl (O-H) 置信度 1.0

  “2021, 68, 945-954 949 cm-1 at 1639.76 may be attributed to the bending vibration modes of O-H groups of these adsorbed H 2O molecules.49 Further, three small bands at 2862.62, 2928.94, cm-1 may be ascribed to the asymmetric and and 2959.97”

  Shojaei 和 Komsari - 2021 - Synthesis of CuO by Electrospinning Method for Sen DOI: 10.17344/acsi.2021.6914
• Alkyl C-H 置信度 1.0

  “The band at 1470 cm-1 ones at 949 cm-1 cm-1 is representative of methylene deformation vibration and that at 2069 of a thiocyanate group.”

  Thermocatalytic Pyrolysis of Exhausted Arthrospira platensis Biomass after Protein or Lipid Recovery DOI: 10.3390/en13205246
• Hydroxyl (O-H) 置信度 1.0

  “1619 stretching stretching 949 W-OH stretching O-H (%) O-W-O w2”

  Surakasi 等 - 2022 - Methylene Blue Dye Photodegradation during Synthes DOI: 10.1155/2022/2882048
• Silicon (Si) 置信度 1.0

  “These 949cm-1 is assigned to the vibration of Si-OH.”

  Van-Phuc Dinh 等 - 2021 - Fabrication of SiO2PEGDA Inverse Opal Photonic Cr DOI: 10.1155/2021/6613154
• Acetate 置信度 1.0

  “After epichlorohydrin-activation (including PEGDE cm-1 grafting), the spectrum of Cl-A LPEI shows a series of peaks at 1080 (C-O and C-C cm-1 cm-1 cm-1 stretching), 1055 (C-N stretching), 1001 (C-O-C stretching), 949 (epoxide cm-1 asymmetri”

  Synthesis of a New Phosphonate-Based Sorbent and Characterization of Its Interactions with Lanthanum (III) and Terbium (III) DOI: 10.3390/polym13091513