What absorbs at 911 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 911 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。

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 911 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

• Alkyl C-H 置信度 1.0

  “These peaks represent C-H (PB).33,34 cm(cid:3)1 Another peak was observed around 911 bending of trans-alkene in polybutadiene wave number for the LP of CRMA interacted at 190-50 that represents the C-H bending of PB.34 At the aforementioned”

  Effect of used motor oil as a rejuvenator on crumb rubber modifier’s released components to asphalt binder DOI: 10.1177/1477760620918600
• Alkyl C-H 置信度 1.0

  “910a 914b P-O-(C) stretch/CH wagging 911 909 3 10071”

  Gillens 和 Powell - 2013 - Rapid quantification of TBP and TBP degradation pr DOI: 10.1007/s10967-012-2147-6
• 置信度 1.0

  “795.33cm(cid:2)1 (Si-O stretch) and absorption from trioctahedrals), 910.81cm(cid:2)1 (Al 2OH bending) shown in Fig.”

  Ultrasonic extraction of arsenic and selenium from rocks associated with mountaintop removal/valley fills coal mining: Estimation of bioaccessible concentrations DOI: 10.1016/j.chemosphere.2010.01.020
• Ammonium 置信度 1.0

  “In the present work, the spectral study of the solution UNIVERSITY 21 209 prepared using ammonium molybdate salt shows strong (broad and sharp) absorption bands at 911±2, 889±2 22 cm-1 cm-1 210 23 and 856±2 (Fig.”

  Sen 等 - 2015 - Nanogram level quantification of molybdenum(VI) by DOI: 10.1039/C5AY01801C.
• Alkyl C-H 置信度 1.0

  “The last peaks (910.91 and cm-1) 877.69 correspond to a bending out of plane vibration =CH (aromatic ring).”

  Belo 等 - 2018 - Development of a Black Liquor Electrolyzer for Lig DOI: 10.1149/08604.0003ecst
• Acetate 置信度 1.0

  “by the presence of C-O stretching at 911 Other characteristic IR bands can be”

  Thermal and surface properties of hybrid materials obtained from epoxy-functional urethane and siloxane DOI: 10.1007/s00289-015-1545-7
• C c single bond 置信度 1.0

  “u n cm-1 The wavenumbers separating normal tissue from meningioma are 911 (C-C stretching d e cm-1 cm-1 r ≈964”

  Gajjar 等 - 2013 - Diagnostic segregation of human brain tumours usin DOI: 10.1039/C2AY25544H.
• 置信度 1.0

  “On the other hand, the weak negative band cm-1 at 911 was assigned to the C15-H and N-H HOOP vibrations of the original state of BR [35].”

  Kawanabe 和 Kandori - 2009 - Photoreactions and Structural Changes of Anabaena DOI: 10.3390/s91209741