What absorbs at 1759 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 1759 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 1759 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

• Carbonyl (C=O) 신뢰도 1.0

  “¼ structure, an orthorhombic unit cell is proposed (a 10.31 Å, cm(cid:3)1, For PLLA, an ester carbonyl band appears at around 1759 b¼18.21Åandc¼9.00Å)containingsixchains.ThePLLAcomplex cm(cid:3)1.”

  Influence of hydrolytic degradation on the surface properties of poly-5d/95l-lactide resorbable bone plates DOI: 10.1016/j.polymdegradstab.2011.04.020
• Alkyl C-H 신뢰도 1.0

  “The OMMT, which permits easy absorption of water into the cm21 characteristic peaks at 2997, 2946, and 1877 are for polymer chains and activates the rate of degradation with CAO cm21 are for CH stretching, while 1759 and 1456 fungal growth”

  Shimpi 等 - 2014 - Preparation, Characterization, and Biodegradation DOI: 10.1002/pc.22658
• Ester 신뢰도 1.0

  “1115 cm-1 cm-1 (C=N (symmetric stretching P-O-C), 1034 (collagen), 1528 guanine, adenine, cytosine) and cm-1 (C=O 1759 ester group vibration of triglycerides).”

  New approach to investigate Common Variable Immunodeficiency patients using spectrochemical analysis of blood DOI: 10.1038/s41598-019-43196-5
• Carboxyl (COOH) 신뢰도 1.0

  “FTIR spectra showed the grafting of AA and MAA monomers onto LSH due to the lack of their carboxylic acid carbonyls bands at 1759 and”

  Application of Vibrational Spectroscopic Techniques in the Study of the Natural Polysaccharides and Their Cross-Linking Process DOI: 10.3390/ijms24032630
• Acetate 신뢰도 1.0

  “at position 1759 This band corresponds to the stretching vibrations of the C=O groups originating from”

  The sex impact on the technological and chemical characteristics of meat derived from the Polish native chicken breed DOI: 10.1038/s41598-023-33430-6
• Acetate 신뢰도 1.0

  “C-H stretching (alkyl) 2993 2982 C=O stretching (-COOester group) 1759 1745”

  Li 等 - 2020 - The Impact of Reactive Ionic Liquids Addition on t DOI: 10.3390/polym12091958
• Acetate 신뢰도 1.0

  “A peak at 1759 stems from C=O stretching dominantly governed by the core states in the conjugated π”

  Structural, optical, and bioimaging characterization of carbon quantum dots solvothermally synthesized from o-phenylenediamine DOI: 10.3762/bjnano.14.17
• Carbonyl (C=O) 신뢰도 1.0

  “Furthermore, another characteristic band is the carbonyl of polymers, which is presented for PBAT and PLA at 1710 cm-1 and 1759 cm-1, respectively.”

  Poly(butylene adipate-co-terephthalate)/Poly(lactic acid) Polymeric Blends Electrospun with TiO2-R/Fe3O4 for Pollutant Photodegradation DOI: 10.3390/polym15030762