What absorbs at 768 cm⁻¹ in an FTIR spectrum?

إجابة سريعة

A band near 768 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.

تعيينات المجموعات الوظيفية المحتملة

يعكس الترتيب الأدلة الأدبية المتراكمة، وليس قاعدة واحدة موثوقة. تأكد دائمًا من سياق عينتك.

منطق الطيف

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

الاستخدام في العالم الحقيقي

هذا النوع من الاستعلام شائع في تحديد البوليمر، وفحص البلاستيك غير المعروف، واستكشاف أخطاء مراقبة الجودة، والتحقق من المواد المعاد تدويرها، ومراجعة تعيين القمم المدعومة بالأدبيات.

الأخطاء الشائعة

• معالجة نطاق معزول واحد كدليل على المادة دون التحقق من ذروة داعمة واحدة أو اثنتين على الأقل.
• تجاهل التداخل: يمكن أن تساهم مجموعات وظيفية متعددة بالقرب من نفس رقم الموجة.
• تخطي التحقق من الصحة عندما قد تؤدي الإضافات أو الخلائط أو الأكسدة أو التلوث إلى تشويه الطيف.

نصيحة التحقق

عندما يبقى الغموض، تحقق من الفرضية باستخدام DSC أو GC-MS أو TGA، خاصة للمخاليط والعينات المتحللة والبوليمرات المملوءة.

الأدبيات وراء هذه التعيينات

• Phosphate (PO4) الثقة 1,0

  “cm-1 (ii) The peak at 768 is assigned to symmetric stretching vibrations of the P-O-P rings and possible sharing At high dose of irradiation, most of the IR spectral bands of (AlO show distinct decrease in their intensities and a prominent”

  Photoluminescence, optical and structural properties of Pr3+-doped fluorophosphate glasses and their induced defects by gamma irradiation DOI: 10.1007/s10854-018-9120-2
• Aromatic ring الثقة 1,0

  “The band at 768 was 3.18% regression attributed to the ortho-disubstituted phenyl group.”

  Attenuated total reflection‐Fourier transform infrared spectroscopy (ATR‐FTIR) for quantification of piroxicam in tablet dosage from as a green analytical method DOI: 10.1002/vjch.202000049
• الثقة 1,0

  “Explicit assignment in text”

  Novel Copper(II) Complexes with N4,S-Diallylisothiosemicarbazones as Potential Antibacterial/Anticancer Drugs DOI: 10.3390/inorganics11050195
• Hydroxyl (O-H) الثقة 1,0

  “The around 1600 cm-1 H-O-H bending were assigned to Si-Si and The former could be attributed to the bands at ν= 768 and 728 Al-Si stretching vibrations, respectively.”

  Nojiri 等 - 2013 - Structural change of alkali feldspar by ball milli DOI: 10.2465/jmps.121122
• Water (H2O) الثقة 1,0

  “cm-1 cm-1, both DFO-B applications, the increased maxima at 1637 and 3342 assigned to as the intensive agarose peaks at 1370cm-1, 1037 cm-1, 928 cm-1, 887 cm-1 and 768 cm-1 were hydroxyls, are probably due to the water absorbed during the a”

  Desferrioxamine B: Investigating the Efficacy of Hydrogels and Ethanol Gels for Removing Akaganeite and Maghemite from Dry Wooden Substrates DOI: 10.3390/f14020247
• الثقة 1,0

  “cm-1 cm-1 parameter in this study, we attempted to estimate those 768 (C-Cl stretch = alkyl halides) and 646 (- C:C-H: phytochemicals quantitatively in MEAIL.”

  Identification of food preservative, stress relief compounds by GC–MS and HR-LC/Q-TOF/MS; evaluation of antioxidant activity of Acalypha indica leaves methanolic extract (in vitro) and polyphenolic fraction (in vivo) DOI: 10.1007/s13197-017-2590-z)
• Metal oxygen الثقة 1,0

  “In Figure 7, the strong peak at 768 cm-1 is due to the W-O bond in the tetrahedral.”

  Electro-Oxidation of Metal Oxide-Fabricated Graphitic Carbon Nitride for Hydrogen Production via Water Splitting DOI: 10.3390/coatings12050548
• Alkyl C-H الثقة 0,9

  “Text: '768 cm-1 for C-H bending'.”

  Bromo-substituted blocked hexamethylene diisocyanate adduct: synthesis, characterization and applica DOI: 10.1080/10601325.2020.1845569