What absorbs at 968 cm⁻¹ in an FTIR spectrum?

Быстрый ответ

A band near 968 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 968 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

• Amide достоверность 1,0

  “2000cm-1, 1.21mgg-1 baseline established in for a ChlorThe absorption bands of Chlorpyrifos are located at 1549, pyrifosstandardandthenoisemeasuredinthesameregionfor 968cm-1, 1412, 1339, 1165, 1088, 1025 and due to C N a blank spectrum and”

  Armenta 等 - 2005 - A validated and fast procedure for FTIR determinat DOI: 10.1016/j.talanta.2005.03.008
• Alkene (C=C) достоверность 1,0

  “and quantified by using Fourier-transform infrared (FTIR) spectroscopy, in the mid-region of 400-4000 cm-1, The FTIR analysis shows that two oil extracts (with and without heat) present a well-defined peak at 968 which represents the double”

  Ariza Ortega 等 - 2012 - Analysis of trans fatty acids production and squal DOI: 10.2478/s11532-012-0104-4
• достоверность 1,0

  “cm(cid:1)1, cm(cid:1)1, cm(cid:1)1 Ti-BEA shows clear peaks at 968 960 and 943 as previously described [20].”

  Effect of water treatment on Sn-BEA zeolite: Origin of 960 cm-1 FTIR peak DOI: 10.1016/j.micromeso.2015.02.012
• Acetate достоверность 1,0

  “1033 -C-O Stretching Phospholipid w w w w - 968 Bending (out of plane) Phosphatidylcholine w w m m m -CH = CH-(trans)”

  Gao 等 - 2017 - Technical note Characterization of lipid constitu DOI: 10.2527/jas2016.1332
• Acetate достоверность 1,0

  “-b 19 1072-1043 -C-O Stretching 1033a 20 1043-1006 -C-O Stretching -HC@CH968a 21 1006-929 (trans)”

  Rapid evaluation of oxidised fatty acid concentration in virgin olive oil using Fourier-transform infrared spectroscopy and multiple linear regression DOI: 10.1016/j.foodchem.2010.06.054
• Alkyl C-H достоверность 1,0

  “2 to 2922 cm-1 (as shown in Figure 4b) and 2921 cm-1 (as indicated in Figure 4c) in the hydrochar, while cm-1 cm-1 shifted to 2922 (as shown in Figure 4b) and 2921 (as indicated in Figure 4c) in the hydrochar, the skeletal vibration at 1255”

  Understanding Hydrothermal Dechlorination of PVC by Focusing on the Operating Conditions and Hydrochar Characteristics DOI: 10.3390/app7030256
• Alkyl C-H достоверность 1,0

  “the peak of 1655.00 the olefinic C-H out of plane bending vibration at the band of 968.22 cm-1 Furthermore, the peak at 3082.50 corresponds to the =C-H stretching vibrations of both the allyl group and the cm-1 aromatic ring, whereas the ab”

  Tan 等 - 2018 - Synthesis and Characterization of Polybenzoxazine DOI: 10.1063/1.5066866
• Alkene (C=C) достоверность 1,0

  “On the other hand, carboxymethyl-ethanolamine was cm-1 968 which is a marker peak of trans double bonds in [26] as a biomarker of phospholipid modification during reported unsaturated fatty acids [14] which may be formed mainly after the Ma”

  Optical screening of diabetes mellitus using non-invasive Fourier-transform infrared spectroscopy technique for human lip DOI: 10.1016/j.jpba.2012.12.009