What absorbs at 638 cm⁻¹ in an FTIR spectrum?

빠른 답변

A band near 638 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 638 cm⁻¹ is usually not enough for material identification by itself.

실제 사용

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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

• 신뢰도 1.0

  “Micro-Raman analysis of silica powder at an excitation wavelength of 532 nm laser showed cm-1, a spectrum having prominent peaks at 638, 802, and 1300 characteristic of Si particles.”

  Dentin Bond Integrity of Filled and Unfilled Resin Adhesive Enhanced with Silica Nanoparticles—An SEM, EDX, Micro-Raman, FTIR and Micro-Tensile Bond Strength Study DOI: 10.3390/polym13071093
• Alkyl C-H 신뢰도 1.0

  “demineralized dentin highlights together with the characteristic bands of apatite ~950 cm-1 cm-1 cm-1 and dentinal collagen 1637 (CC), 1455 (CH 2), specific bands of the monomer cm-1 cm-1 (CC), 1455 cm-1 (CH 2), specific bands of the monome”

  Marginal Adaptation Assessment for Two Composite Layering Techniques Using Dye Penetration, AFM, SEM and FTIR: An In-Vitro Comparative Study DOI: 10.3390/app11125657
• Sulfate (SO4) 신뢰도 1.0

  “Such spectral regions host features compatible with those of a sulfate (983, 1087, 1116, and 1182 cm-1), probably barite (BaSO4), to which the two uncertain peaks at 611 and 638 cm-1 also appear to be assigned.”

  Degradation Products Assessment of the Wooden Painted Surfaces from a XVIIth Heritage Monastery DOI: 10.3390/app13042124
• 신뢰도 1.0

  “The synthesized IONPs show characteristic absorption cm-1 around 638.4 which is attributed to vibration of Fe-O bonds.”

  Kawish 等 - 2020 - Enhancement in Oral Absorption of Ceftriaxone by H DOI: 10.3390/pharmaceutics12060492
• 신뢰도 1.0

  “FTIR Analysis cm-1 cm-1 The FTIR Peaks (KBr): 3323 (amine -NH 2, -NH stretch), 3378 (amine cm-1 cm-1 -NH 2, N-H stretch), 1046 (C-O-C ether linkage stretch), and 638 (C-Cl stretch).”

  Copper-Treated Environmentally Friendly Antipathogenic Cotton Fabric with Modified Reactive Blue 4 Dye to Improve Its Antibacterial and Aesthetic Properties DOI: 10.3390/coatings13010133
• Metal oxygen 신뢰도 1.0

  “396 cm-1 (B1g), 516 cm-1 (A1g+B1g), and 638 cm-1 (Eg) inThe minimum energy paths and corresponding activation barcreasingly demonstrated the fabrication of TiO2 on the surface riers for all elementary steps were calculated using the climbof”

  Wei 等 - 2023 - Photoelectrocatalytic reduction of CO2 catalyzed b DOI: 10.1016/S1872-2067(23)64395-5
• 신뢰도 1.0

  “the peak at 516 cm-1 was caused by the Si-O-Fe stretching vibrations whilst the peaks at 638 cm-1 and at 838 cm-1 were due to Si-O stretching vibrations and Si-O-Al stretching vibrations, respectively.”

  Investigation on the Painting Materials and Profile Structures Used in Ancient Chinese Folk Architectural Paintings by Multiple Analytical Methods DOI: 10.3390/coatings12030320
• Phosphate (PO4) 신뢰도 0.95

  “Explicit assignment in text.”

  Preparation of LiFePO4 Powders by Ultrasonic Spray Drying Method and Their Memory Effect DOI: 10.3390/ma14123193