What absorbs at 1990 cm⁻¹ in an FTIR spectrum?

빠른 답변

A band near 1990 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

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가능한 재료

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스펙트럼 로직

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 1990 cm⁻¹ is usually not enough for material identification by itself.

실제 사용

이러한 유형의 질의는 고분자 식별, 미지 플라스틱 스크리닝, QC 문제 해결, 재활용 재료 검증 및 문헌 기반 피크 할당 검토에서 일반적입니다.

일반적인 실수

• 하나의 고립된 밴드를 재료의 증거로 취급하고 최소 하나 또는 두 개의 지원 피크를 확인하지 않는 것.
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• 첨가제, 혼합물, 산화 또는 오염이 스펙트럼을 왜곡할 수 있는 경우 검증을 건너뜁니다.

검증 조언

모호성이 남아 있는 경우, 특히 혼합물, 분해된 시료 및 충전 폴리머의 경우 DSC, GC-MS 또는 TGA로 가설을 검증하십시오.

이 할당의 배경이 되는 문헌

• Adsorbed carbon monoxide 신뢰도 1.0

  “cm-1 Lower wavenumber IR bands seen between 1990 and 1920 for CoRe(N) are tentatively assigned to bridging CO's on the cobalt and terminal carbonyls on Re(0) clusters.”

  Kumar 等 - 2011 - In Situ FT-IR Study on the Effect of Cobalt Precur DOI: 10.1021/jp104878e
• 신뢰도 1.0

  “silicah 2000 and 1839 Combinational bands of Si-O-Si 1990 and 1873 2000 and 1852 1008C Wavenumbers for additional peaks observed for substrate temperatures of 75 and are indicated in italics, while ''SS'' and ''AS'' stand for symmetric and”

  Leewis 等 - 2006 - Ammonia adsorption and decomposition on silica sup DOI: 10.1016/j.apsusc.2005.12.115
• Ring structure 신뢰도 1.0

  “These are resulting from quadrant and semicircle et al., predominantly anti-symmetric and symmetric stretching ring stretching, respectively (Colthup 1990;”

  Microprobing the molecular spatial distribution and structural architecture of feed-type sorghum seed tissue (Sorghum Bicolor L.) using the synchrotron radiation infrared microspectroscopy technique DOI: 10.1107/S0909049511023727
• Hydroxyl (O-H) 신뢰도 1.0

  “band was detected in the range of 3000-3600 This (cell debris obtained after ultrasound treatment with cell-bound lipase band is related to the presence of hydroxyl groups because naturally immobilized) of axial deformation of the O-H band”

  Catalytic and physical features of a naturally immobilized Yarrowia lipolytica lipase in cell debris (LipImDebri) displaying high thermostability DOI: 10.1007/s13205-020-02444-6
• Carbonyl (C=O) 신뢰도 0.9

  “ν(CO) for complex 3”

  Ligand effects on structural, protophilic and reductive features of stannylated dinuclear iron dithiolato complexes DOI: 10.1039/d0nj04790b
• 신뢰도 0.9

  “Text: 'band (located at 1990 ... CO'”

  Electrooxidation of glycerol on platinum nanoparticles: Deciphering how the position of each carbon affects the oxidation pathways DOI: 10.1016/j.electacta.2013.09.032
• C#c 신뢰도 0.7

  “Text: 'C≡C the bond in 1-propynylbenzene. The wide overtone ... cm-1 bands between 1760 and 1990 indicate the substituted'”

  Kumar 等 - 2018 - Application of High-Resolution NMR and GC-MS to St DOI: 10.1021/acsomega.8b01284