What absorbs at 781 cm⁻¹ in an FTIR spectrum?

빠른 답변

A band near 781 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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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 781 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

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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

• Silicon (Si) 신뢰도 1.0

  “The cm-1 cm-1 absorption band at 781 and 1050 are assigned to the v 1symmetric vibration and v 3asymmetrical stretching vibration of the Si-O bond.”

  Ilmi 等 - 2020 - Multi-analytical characterizations of prehistoric DOI: 10.1016/j.microc.2020.104738
• 신뢰도 1.0

  “cm-1, The spectra produced strong peaks at 521.38 and 516.39 corresponding to the C-I (stretching) functional group of alkyl halides, for the leaf and stem, respectively, as well as cm-1 a strong peak corresponding to the C-Cl (stretching)”

  Phytochemical Composition of Combretum molle (R. Br. ex G. Don.) Engl. & Diels Leaf and Stem Extracts DOI: 10.3390/plants12081702
• Alkyl C-H 신뢰도 1.0

  “Both samples treated with TEMPO derivatives show the characteristic signals of their functional groups: in particular, the band at 1709 and 1717 cm-1 can be associated with the cm-1 functional groups: in particular, the band at 1709 and 171”

  Cicogna 等 - 2022 - Surface Functionalization of Face Masks with Cold DOI: 10.3390/molecules27238632
• Oxalate 신뢰도 1.0

  “The FTIR spectrum peaks at 780.7, 1336.4, and 1631.0 all correspond to reported peak positions for sodium oxalate [16].”

  Evaluation of Formate Salt PCM’s for Latent Heat Thermal Energy Storage DOI: 10.3390/en14030765
• 신뢰도 1.0

  “The vibrational band centred at 781 cm-1 is ascribed to the stretching mode modes due to the formation of nonbridge oxygen.”

  Effect of Yb3+ on the Structural and Visible to Near-Infrared Wavelength Photoluminescence Properties in Sm3+-Yb3+-Codoped Barium Fluorotellurite Glasses DOI: 10.3390/ma15093314
• C c single bond 신뢰도 1.0

  “Furthermore, for the spectrum of cm-1 1545, and 1552 cm-1, respectively, can be attributed to the C-C stretching vibration of benzene ring HACSa, HACCa, HACPc, and HACGa, absorption peaks at 781, 767, 772, 735, 739 corresponded 1478cm-1 [3,”

  Modification of Hydroxypropyltrimethyl Ammonium Chitosan with Organic Acid: Synthesis, Characterization, and Antioxidant Activity DOI: 10.3390/polym12112460
• Silicon (Si) 신뢰도 1.0

  “The peaks at 113 cm-1 cm-1 876 cm-1 and 781 cm-1 were assigned to Si-O-Si symmetric stretching vibrations [36].”

  Adsorption of Hexavalent Chromium Using Banana Pseudostem Biochar and Its Mechanism DOI: 10.3390/su10114250
• Nucleic acid 신뢰도 1.0

  “LLM confirmed rule peak-group candidate”

  Zelig 等 - 2010 - Biochemical analysis and quantification of hematop DOI: 10.1117/1.3442728(cid:4)