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

Snel antwoord

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.

Mogelijke functionele-groeptoewijzingen

Ranglijst weerspiegelt cumulatief literatuurbewijs, niet één gezaghebbende regel. Bevestig altijd aan de hand van uw monsterecontext.

Mogelijke materialen

Materialen worden alleen getoond wanneer dezelfde literatuurpool deze band en ten minste één extra karakteristieke piek ondersteunt.

Spectrumlogica

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.

Gebruik in de praktijk

Dit type query komt vaak voor bij polymeeridentificatie, screening van onbekende kunststoffen, probleemoplossing bij QC, verificatie van gerecycled materiaal en literatuurondersteunde beoordeling van piektoewijzing.

Veelgemaakte fouten

• Het behandelen van een enkele geïsoleerde band als bewijs van een materiaal zonder ten minste een of twee ondersteunende pieken te controleren.
• Overlap negeren: meerdere functionele groepen kunnen bijdragen rond hetzelfde golfgetal.
• Validatie overslaan wanneer additieven, mengsels, oxidatie of verontreiniging het spectrum kunnen verstoren.

Advies voor verificatie

Wanneer dubbelzinnigheid blijft bestaan, valideer de hypothese met DSC, GC-MS of TGA, vooral voor mengsels, gedegradeerde monsters en gevulde polymeren.

Literatuur achter deze toewijzingen

• N h vertrouwen 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
• vertrouwen 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 vertrouwen 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 vertrouwen 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
• vertrouwen 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 vertrouwen 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 vertrouwen 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