What absorbs at 3485 cm⁻¹ in an FTIR spectrum?

빠른 답변

A band near 3485 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 3485 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.

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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

• C-O single bond 신뢰도 1.0

  “x = For pure PVA, four characteristic absorption bands are observed: the one at 3485 cm-1 which is assigned to vibration along the C-OH-chains bonds in PVA;”

  Fernández 等 - 2017 - DOI: 10.17230/ingciencia.13.25.6
• 신뢰도 1.0

  “Furthermore, the cm-1 cm-1 in the typical area was attributed to the N-H stretching vibration at 3485 cm-1 [36].”

  Purification and Characterization of a Novel Calcium-Binding Heptapeptide from the Hydrolysate of Tilapia Bone with Its Osteogenic Activity DOI: 10.3390/foods11030468
• Alkene (C=C) 신뢰도 1.0

  “The characteristic cm-1 which can assign to the stretching vibrations of conjugate double bonds in aromatic ring absorption peak of hydroxyl appeared at 3485 and the peak of carbonyl splits into two peaks cm-1 cm-1 framework.”

  Effect of Phenolic Resin Oligomer Motion Ability on Energy Dissipation of Poly (Butyl Methacrylate)/Phenolic Resins Composites DOI: 10.3390/polym12020490
• Hydroxyl (O-H) 신뢰도 1.0

  “The sharp pair bands at 3485 cm-1 Thr11814, 36, (+)/3428 (-) in MRh originate from the O-H stretch of and similar bands at 3485 in MG and cm-1 (+)/3432 (-) 3486 in MR are expected because of the O-H stretches of the corresponding Ser residu”

  Spectral Tuning Mechanism of Primate Blue-sensitive Visual Pigment Elucidated by FTIR Spectroscopy DOI: 10.1038/s41598-017-05177-4
• Amide 신뢰도 1.0

  “In the spectrum of PMA (B) in Figure 2, sponded to C=O stretching (amide I), N-H bending (amide II), and C-N stretching (amcm-1 the characteristic absorption bands appeared at 3485, 2930, and 2890 due to -OH”

  Sathya Seeli 等 - 2023 - Zinc Oxide-Incorporated Chitosan-Poly(methacrylic DOI: 10.3390/jfb14040228
• Alkene (C=C) 신뢰도 0.9

  “Explicit assignment: 'C=C from DiEP1 and DiEP2 is observable at 3485'”

  New Eco-Friendly Synthesized Thermosets from Isoeugenol-Based Epoxy Resins DOI: 10.3390/polym12010229