What absorbs at 841 cm⁻¹ in an FTIR spectrum?

빠른 답변

A band near 841 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

동일한 문헌 풀이 이 밴드와 하나 이상의 추가 특징 피크를 지원하는 경우에만 물질이 표시됩니다.

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 841 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.
• 겹침 무시: 여러 작용기가 동일한 파수 근처에서 기여할 수 있습니다.
• 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

• C c single bond 신뢰도 1.0

  “The ~841 band is assigned to tained two-dimensional pattern employing a data processing software, C-C the vibration coupling of stretching, CH2 rocking, and CH3 rocking”

  Probing the difference of crystalline modifications and structural disorder of isotactic polypropylene via high-resolution FTIR spectroscopy DOI: 10.1016/j.polymer.2021.123722
• Nucleic acid 신뢰도 1.0

  “The presence of B-DNA and Z-DNA bands at 841 and 815 suggested that only the Z-DNA form is more pronounced in melanoma, whereas both DNA forms were detected in BCC [92].”

  Vibrational Spectroscopy Fingerprinting in Medicine: from Molecular to Clinical Practice DOI: 10.3390/ma12182884
• C c single bond 신뢰도 1.0

  “at 841 cm-1 and 1168 cm-1,corresponding to C-C isopropyl stretching;”

  From Waste to Potential Reuse: Mixtures of Polypropylene/Recycled Copolymer Polypropylene from Industrial Containers: Seeking Sustainable Materials DOI: 10.3390/su14116509
• Acetate 신뢰도 1.0

  “In κ-carrageenan, the vibrations from 841, 921 and 1035 cm-1 and 1035 could be assigned to -C-O-SO 3stretching vibrations from the galactose-4-sulphate, cm-1 could be assigned to -C-O-SO3stretching vibrations from the galactose-4-sulphate,”

  Croitoru 等 - 2020 - Physically Crosslinked Poly (Vinyl Alcohol)Kappa- DOI: 10.3390/polym12030560
• Carbohydrate 신뢰도 1.0

  “The band α-anomer of 841 represents the functional groups of polysaccharides include also the in the pyranose form of sugars.”

  Egyptian Opuntia ficus-indica (OFI) Residues: Recovery and Characterization of Fresh Mucilage from Cladodes DOI: 10.3390/horticulturae9070736
• Carbohydrate 신뢰도 1.0

  “Finally, absorptions at 944 cm-1 and 841 cm-1 were assigned to the pyranose ring.”

  Gabriela Chuc-Gamboa 等 - 2021 - Antibacterial Behavior of Chitosan-Sodium Hyaluron DOI: 10.3390/app1103
• Alkene (C=C) 신뢰도 1.0

  “A peak at 1228 indicates cm-1 a strong CO bond, and a peak at 841 indicates a bending C=C bond of the alkene.”

  Grgac 等 - 2022 - The Effect of Ultrasonic Treatment on the Binding DOI: 10.3390/ma15020470
• Alkyl C-H 신뢰도 1.0

  “rock, C-C stretch 1165 CH bend, CH 3 rock, CH bend 996 CH bend, CH 3 3 rock, C-CH stretch 841 CH 2 3 rock, C-C stretch, C-CH stretch 809 CH 2 2915 CH stretch Polyethylene (PE) (Asensio et al., 2009;”

  Malla-Pradhan 等 - 2022 - Occurrence and Distribution of Microplastics from DOI: 10.1007/s11270-022-05896-z