What absorbs at 1295 cm⁻¹ in an FTIR spectrum?

Быстрый ответ

A band near 1295 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 1295 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

• Acetate достоверность 1,0

  “Again, it is reported that for C-H scissoring and bending coming from glycerol cm-1 cholesterol has a spatial helicoidal structure and it confor C-O stretching and peaks at 1295, 1247 and 1195 tains a double bond in the second cyclohexane r”

  Jana 等 - 2009 - Molecular Orientation of Polyurethane Based Liquid DOI: 10.1080/10601320903158719
• Amide достоверность 1,0

  “The peaks at 1295 and are assigned to the C-N stretching mode of the benzenoid rings that of conducting protonated from PANI[10].”

  Synthesis and characterization thin films of conductive polymer (PANI) for optoelectronic device application DOI: 10.1063/1.4948838
• Nitrate достоверность 1,0

  “The peak at 1172 which cm-1 peaks at 1215 and 1295 are assigned to monodentate corresponds to the low-frequency component of the split band nitrates, and the particular monodentate nitrate peak at 1295 resulting from s(NH 3) coordinated to”

  Pena 等 - 2004 - Identification of surface species on titania-suppo DOI: 10.1021/jp0313122
• Acetate достоверность 1,0

  “deformation DGBEA1%ZnO-APTES-DGBEA3%ZnO-APTES-DGBEA5%ZnO-APTES-DGBEA7%ZnO-APTES-DGBEATentativefrequencyassignment 630(vw)638(vw)632(w)638(w)628(w)C-O-Obonding(aromatics) symmetricstretching bendingvibration 1295(w)1295(m)1295(m)1289(vw)1291”

  Investigation of the Thermal and Dielectric Behavior of Epoxy Nano-Hybrids by using Silane Modified Nano-ZnO DOI: 10.1007/s12633-017-9604-3
• Acetate достоверность 1,0

  “cm-1) bending vibration (assigned to 1580 when increasing the plasma exposure time, bending vibration (assigned to 1580 cm-1) when increasing the plasma exposure time, cm-1) while significant increase in C-O-C stretching bands (1295, 1245,”

  Plasma-Induced Graft Polymerization of Polyethylenimine onto Chitosan/Polycaprolactone Composite Membrane for Heavy Metal Pollutants Treatment in Industrial Wastewater DOI: 10.3390/coatings12121966
• Amide достоверность 1,0

  “2b) aresharper than Published cm(cid:1)1 C-N rings, while the bands at 1295 is correspond to that of the CdS/PANI (Fig.”

  A novel composite of CdS nanorods growing on a polyaniline-Cd2+ particles surface with excellent formaldehyde gas sensing properties at low temperature DOI: 10.1039/c8ra05082a
• Alkyl C-H достоверность 1,0

  “cm-1 Similarly, the peak observed at 1295 (i in the Figure 3) in the PEO spectrum is assigned to asymmetric CH torsion [29].”

  Composite Polymer Electrolytes Based on (PEO)4CF3COOLi and Multi-Walled Carbon Nanotube (MWCNT) DOI: 10.3390/polym15010049
• Hydroxyl (O-H) достоверность 1,0

  “One cm-1, of these peaks, seen at 1295 represents the in-plane bending vibration of the -OH”

  The Influence of Emulsifiers on the Physiochemical Behavior of Soy Wax/Rice Bran Oil-Based Oleogels and Their Application in Nutraceutical Delivery DOI: 10.3390/gels9010047