What absorbs at 1169 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 1169 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.

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 1169 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

• Carboxyl (COOH) 신뢰도 1.0

  “shoulder band at about The 1459 and 1384cm-1 bands are methyl bending signals and bands at 1243 1169cm-1 The different samples of coatings of amphorae were studied are different bending vibrations from COOH.”

  Font 等 - 2007 - Fourier transform infrared spectroscopy as a suita DOI: 10.1016/j.aca.2007.07.021
• Acetate 신뢰도 1.0

  “The C-O-H bending vibrations of the CH 2-OH group appeared at 1435 and the cellulose cm1 skeleton vibrations, including the C-O-C bridge stretching, appeared at 1169 (Hinterstoisser et al., 2001).”

  Wang 等 - 2022 - Molecular-level characterization of changes in the DOI: 10.21203/rs.3.rs-882939/v1
• Amide 신뢰도 1.0

  “At 50 the absorption intensity at 1169 at 1409 is assigned to the forcm(cid:0) ◦C 1 C-N is 0.98 a.u., but at 150 it is 1.33 a.u.”

  Curing mechanism of triglycidylamine crosslinked soybean protein adhesive analyzed by Fourier transform infrared, second derivative infrared and two-dimensional correlation spectroscopy DOI: 10.1016/j.ijadhadh.2021.102825
• Alkyl C-H 신뢰도 1.0

  “cm-1 Bands at 1169 and 1156 arise from a combination of OH and CH bending vibrations [54].”

  Direct Quantification of Drug Loading Content in Polymeric Nanoparticles by Infrared Spectroscopy DOI: 10.3390/pharmaceutics12100912
• Ester 신뢰도 1.0

  “Explicitly assigned to ester group vibrations.”

  Biowaxes from Palm Oil as Promising Candidates for Cosmetic Matrices and Pharmaceuticals for Human Use DOI: 10.3390/ma16124402
• 신뢰도 1.0

  “11c) measured after curing for 10 months, the Si-O-Si band (1080 cm-1) is remarkably more pronounced, while the faint Si-O-C band (1169 that is detected in 28 days is barely detected in 10 months, suggesting that polymerization has proceede”

  Karatasios 等 - 2017 - Modification of water transport properties of poro DOI: 10.1515/pac-2016-1104
• Aromatic ring 신뢰도 1.0

  “Newly cm-1 O=S=O, appearing peaks at 1169, 956, and 2923 are attributed to the benzene ring group and O=S=O -CH stretching vibrations in the PSSNa molecule, the peaks for and benzene ring shift by 2”

  Liu 等 - 2019 - Novel Selective Depressant of Titanaugite and Impl DOI: 10.3390/min9110703
• Amide 신뢰도 1.0

  “940 cm-1 and 1169 cm-1 are C-N stretching vibrations of imidazole groups and C=N stretchThe absorption peak at 903 cm-1 originated from the epoxy group of the polymer, which ing vibrations at 1570 cm-1 [22].”

  Design and Preparation of Imidazole Ionic Liquid-Based Magnetic Polymers and Its Adsorption on Sunset Yellow Dye DOI: 10.3390/ma15072628