What absorbs at 969 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 969 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.

가능한 작용기 할당

순위는 단일 권위 규칙이 아닌 축적된 문헌 증거를 반영합니다. 항상 샘플 상황에 대해 확인하세요.

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 969 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.

이 할당의 배경이 되는 문헌

• Alkyl C-H 신뢰도 1.0

  “The peak at 969 assigned to trans -CH=CHbending vibration from 219 phospholipid among different animal species (Che Man, Z.”

  Gao 等 - 2021 - Complementarity of FT-IR and Raman spectroscopies DOI: 10.1016/j.foodchem.2020.128754
• Silicon (Si) 신뢰도 1.0

  “The absorption band at 953 and is designated to the stretching 857cm-1 frequency of Sr-O bond and Si-O stretching frequency appears at in the prepared silicate materials is due to the asymmetric 969cm-1 stretching frequency of Si-O bond in”

  Down-conversion characteristics of Eu3+ doped M2Y2Si2O9 (M = Ba, Ca, Mg and Sr) nanomaterials for innovative solar panels DOI: 10.1016/j.pnsc.2019.07.003
• Acetate 신뢰도 1.0

  “This is the case of the bands at 1208 and 1126 cm-1 (νas C-O-C, ring), and 1024 and 969 cm-1 (ν C-O, C-C) in the α-ring, respectively.”

  Optimization and Characterization of a Novel Exopolysaccharide from Bacillus haynesii CamB6 for Food Applications DOI: 10.3390/biom12060834
• C c single bond 신뢰도 1.0

  “The values cm-1(esterC-O-C g-1) DH (lactoneC-O-Casymmetricbend),1214 of the eutectic melting enthalpy (J for a given cm-1 asymmetric bend), 1074 (lactone C-C symmetric dispersions, determined by integration of the eutectic peak cm-1(esterC-”

  Gorniak 等 - 2016 - Thermal, spectroscopic and dissolution studies of DOI: 10.1007/s10973-016-5279-z
• Nucleic acid 신뢰도 1.0

  “cm21 cm21 band at 969 and 935 are assigned to DNA backbone”

  Jangir 等 - 2013 - Role of Minor Groove Width and Hydration Pattern o DOI: 10.1371/journal.pone.0069933
• Bromine 신뢰도 1.0

  “cm-1 cm-1 The negative band at 976 and the positive band at 969 in Figure 9b were assigned to the cm-1 N-D in-plane bending vibrations of BR and BR K, respectively [34].”

  Kawanabe 和 Kandori - 2009 - Photoreactions and Structural Changes of Anabaena DOI: 10.3390/s91209741
• Amide 신뢰도 1.0

  “cm-1, grown MAPbBr single crystal is consistent with Prominent peaks are at 969 3 cm-1, cm-1, cm-1, 1477 1584 and 3165 which can be attributed to the C-N stretch, symmetric 5 3+”

  Origin of Defects and Positron Annihilation in Hybrid and All-Inorganic Perovskites DOI: 10.1021/acs.chemmater.1c03540
• Acetate 신뢰도 1.0

  “Candida krusei Candida glabrata Candida parapsilosis Candida albicans Species and and Preparation Prominent Bands in PC2 Loadings Plots (cm-1) (νC-O) 1166-C-O stretch of Method Carbohydrates-Polysaccharides Candida krusei and Candida Specie”

  Influence of the Sample Preparation Method in Discriminating Candida spp. Using ATR-FTIR Spectroscopy DOI: 10.3390/molecules25071551