What absorbs at 401 cm⁻¹ in an FTIR spectrum?

Brzi odgovor

A band near 401 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.

Moguće dodjele funkcionalnih skupina

Rangiranje odražava akumulirane literaturne dokaze, a ne jedno autoritativno pravilo. Uvijek provjerite u kontekstu vašeg uzorka.

Mogući materijali

Materijali su prikazani samo kada ista literatura podržava ovu traku i barem jedan dodatni karakteristični vrh.

Logika spektra

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

Upotreba u stvarnom svijetu

Ova vrsta upita uobičajena je u identifikaciji polimera, probiru nepoznate plastike, rješavanju problema u kontroli kvalitete, provjeri recikliranog materijala i pregledu dodjele vrhova potkrijepljenom literaturom.

Uobičajene pogreške

• Tretiranje jedne izolirane vrpce kao dokaza materijala bez provjere barem jednog ili dva podržavajuća pika.
• Zanemarivanje preklapanja: više funkcionalnih skupina može doprinositi u blizini istog valnog broja.
• Preskakanje validacije kada aditivi, mješavine, oksidacija ili kontaminacija mogu izobličiti spektar.

Savjet za provjeru

Kada nejasnoća ostane, validirajte hipotezu pomoću DSC, GC-MS ili TGA, posebno za mješavine, degradirane uzorke i punjene polimere.

Literatura iza ovih dodjela

• N h pouzdanost 1,0

  “the peak at 401.2 4+ eV corresponds to NH in the APP.”

  Liang 等 - 2020 - Thermal Kinetics of a Lignin-Based Flame Retardant DOI: 10.3390/polym12092123
• pouzdanost 1,0

  “The weak peak at 401.1 eV is indicative of the presence of terminal amino functional group, originating from the incomplete”

  Dual Roles of [NCN]2- on Anatase TiO2: A Fully Occupied Molecular Gap State for Direct Charge Injection into the Conduction Band and an Interfacial Mediator for the Covalent Formation of Heterostructured g-C3N4/a-TiO2 Nanocomposite DOI: 10.1016/j.apcatb.2020.119036
• Ammonium pouzdanost 1,0

  “In this investigation, a novel compound characteristic peak at 401.36 eV corresponding to the -NH3?.”

  Synthesis of a novel compound based on chitosan and ammonium polyphosphate for flame retardancy applications DOI: 10.1007/s10570-019-02671-y
• Metal oxygen pouzdanost 1,0

  “Figure 6b shows that the water contact 2 N-C 15.2° peaks at 400.7 eV were assigned to the bond, suggesting angle of APTMS-TiO 2@SiO was decreased to and that 2 126.2°”

  Wang 等 - 2023 - Surface-Modified TiO2@SiO2 Nanocomposites for Enha DOI: 10.1021/acsomega.3c02679
• pouzdanost 1,0

  “The peaks at 401.0 and 404.6 eV are attributed to the amino group (C-N-H) the graphitic N.”

  Underlying Mechanisms of Reductive Amination on Pd-Catalysts: The Unique Role of Hydroxyl Group in Generating Sterically Hindered Amine DOI: 10.3390/ijms23147621
• N h pouzdanost 1,0

  “In bonds), 400.43 (NH contrast, CoPc-immobilized GO showed the shifting of bands and a considerable intensity enhancement of the peak at 400.69 eV due to the electron-withdrawing effect of GO (Fig-”

  Cobalt Phthalocyanine Immobilized on Graphene Oxide: An Efficient Visible-Active Catalyst for the Photoreduction of Carbon Dioxide DOI: 10.1002/chem.201304189
• Secondary amine pouzdanost 1,0

  “BH (Figure For nylon 6-NH, vibrations of amide I and 401.0 eV attributed to the secondary amine and the new 3”

  Yan 等 - 2022 - Functionalized Nylon 6 Fabric as an Efficient and DOI: 10.1021/acsomega.2c03401