What absorbs at 1326 cm⁻¹ in an FTIR spectrum?

Быстрый ответ

A band near 1326 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.

Возможные назначения функциональных групп

Ранжирование отражает накопленные литературные данные, а не единственное авторитетное правило. Всегда проверяйте в контексте вашего образца.

Возможные материалы

Материалы отображаются только при поддержке данной полосы и хотя бы одного дополнительного характеристического пика из того же литературного пула.

Логика спектра

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 1326 cm⁻¹ is usually not enough for material identification by itself.

Использование в реальных условиях

Такой тип запроса распространен при идентификации полимеров, скрининге неизвестных пластиков, устранении неполадок в контроле качества, проверке переработанных материалов и анализе отнесения пиков на основе литературы.

Распространенные ошибки

• Рассмотрение одной изолированной полосы как доказательства материала без проверки хотя бы одного или двух поддерживающих пиков.
• Игнорирование перекрытия: несколько функциональных групп могут вносить вклад вблизи одного и того же волнового числа.
• Пропуск проверки, когда добавки, смеси, окисление или загрязнение могут исказить спектр.

Рекомендации по проверке

Когда остается неоднозначность, проверьте гипотезу с помощью DSC, GC-MS или TGA, особенно для смесей, деградированных образцов и наполненных полимеров.

Литература, лежащая в основе этих назначений

• Lipid достоверность 1,0

  “The peak at 1326 was assigned to lipid content,”

  Krishnan 等 - 2020 - Leaf Extract ofDillenia indicaas a Source of Selen DOI: 10.3390/coatings10070626
• Acetate достоверность 1,0

  “Peak identity C-O-C C=O/C-O C=C C=O stretch Edge states bending cm-1 It should be noted that the SERS on GQDs is also observed at 1326 for the D cm-1 peak and at 1584 for G peaks, similar to the Raman spectrum of the normal graphite,”

  Surface Enhanced Raman Scattering in Graphene Quantum Dots Grown via Electrochemical Process DOI: 10.3390/molecules26185484
• Acetate достоверность 1,0

  “Amorphous cellulose is a hydrophilic part of cellu1740-1760 and asymmetrical vibration of tannin aromatic C-O and lose with high abundance of hydroxyl groups (-OH) so that cm-1 CH 2-OH groups at peaks of 1326, 1037, and 1420 the part has st”

  Nanostructural, Chemical, and Thermal Changes of Oil Palm Empty Fruit Bunch Cellulose Nanofibers Pretreated with Different Solvent Extractions DOI: 10.1007/s12649-017-0098-4
• Alkyl C-H достоверность 1,0

  “(C-H stretching reported that the frequencies of allicin in FTIR spectra were 3083 cm-1 2), 2978 cm-1 (C-H stretching symmetric of =CH 2),1634 cm-1 (a medium asymmetric of =CH intensity band originating from stretching of terminal C=C bond”

  Tasci 等 - 2016 - Determination of alliin and allicin in the plant o DOI: 10.17660/ActaHortic.2016.1143.19
• Amide достоверность 1,0

  “Notably, The bands at 1326 cm-1 and 1238 cm-1 are attributed to the C-N stretching of the aromatic cm-1 cm-1 1633 is due to the C=C stretching of the quinoid, and 1428 is the characteristic benzenoid rings.”

  Preparation of Anionic Surfactant-Based One-Dimensional Nanostructured Polyaniline Fibers for HydrogenStorage Applications DOI: 10.3390/polym15071658
• Alkyl C-H достоверность 1,0

  “The cm-1 absorbance ratio of the bands detected at 1326 and 2903 was attributed to the flexural and stretching vibrations of the C-H bonds.”

  Part A: Biodegradable Bio-Composite Film Reinforced with Cellulose Nanocrystals from Chaetomorpha linum into Thermoplastic Starch Matrices DOI: 10.3390/polym15061542
• Thiocarbonyl достоверность 1,0

  “The FTIR spectrum of cm-1 the HNT-TSC-PC showed the characteristic bands of HNTs included, 1649, 539 and 3621-3696 as well as cm-1, two additional band at 1326 which is representative of C=S stretching and the strong absorption peaks of”

  Investigation of halloysite nanotubes and Schiff base combination with deposited copper iodide nanoparticles as a novel heterogeneous catalytic system DOI: 10.1038/s41598-021-02991-9
• Alkyl C-H достоверность 1,0

  “The three new bands confirmed the cm-1 cm-1 successful carboxymethylation of carrageenan: 1595 and 1418 related to the asymmetrical and symmetrical stretching vibrations of carboxylate anions (-COO-) and cm-1 the bands at 1326 attributed to”

  Application of Vibrational Spectroscopic Techniques in the Study of the Natural Polysaccharides and Their Cross-Linking Process DOI: 10.3390/ijms24032630