What absorbs at 824 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 824 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.

সম্ভাব্য কার্যকরী-গ্রুপ অ্যাসাইনমেন্ট

র্যাঙ্কিং জমা হওয়া সাহিত্য প্রমাণ প্রতিফলিত করে, একটি একক কর্তৃত্বপূর্ণ নিয়ম নয়। সর্বদা আপনার নমুনা প্রসঙ্গের বিরুদ্ধে নিশ্চিত করুন।

Possible materials

Materials are shown only when the same literature pool supports this band and at least one additional characteristic peak.

Spectrum logic

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

Real-world usage

This type of query is common in polymer identification, unknown plastic screening, QC troubleshooting, recycled-material verification, and literature-backed peak assignment review.

Common mistakes

• Treating one isolated band as proof of a material without checking at least one or two supporting peaks.
• Ignoring overlap: multiple functional groups can contribute near the same wavenumber.
• Skipping validation when additives, blends, oxidation, or contamination may distort the spectrum.

Verification advice

When ambiguity remains, validate the hypothesis with DSC, GC-MS, or TGA, especially for blends, degraded samples, and filled polymers.

এই অ্যাসাইনমেন্টগুলোর পেছনে সাহিত্য

• Oxygen heterocycle আত্মবিশ্বাস 1.0

  “LLM confirmed rule peak-group candidate”

  Mudri 等 - 2020 - Comparative Study of Aromatic and Cycloaliphatic I DOI: 10.3390/polym12071494
• Silicon (Si) আত্মবিশ্বাস 1.0

  “ences corresponding increase in absorption peaks at 824 and 1055 In the mean time, a non-porous sample (c-Si) showed insignificant to the Si O Si vibration mode.”

  A combination of electroless and electrochemical etching methods for enhancing the uniformity of porous silicon substrate for light detection application DOI: 10.1016/j.apsusc.2012.03.056
• Alkyl C-H আত্মবিশ্বাস 1.0

  “C-H rocking of pure PVA is considered the cm-1 peak at 824 [31].”

  From Green Remediation to Polymer Hybrid Fabrication with Improved Optical Band Gaps DOI: 10.3390/ijms20163910
• আত্মবিশ্বাস 1.0

  “The peaks at 746 and 824 cm-1 in the UiO-66 framework, Zr-µ3-OH stretching and OH bending modes, respectively [46].”

  Butova 等 - 2023 - In Situ FTIR Spectroscopy for Scanning Accessible DOI: 10.3390/nano13101675
• C c single bond আত্মবিশ্বাস 1.0

  “In the spectra obtained after the cut-off at 3 kDa, the only signals related to proteins are the out-of-ring breathing of cm-1), cm-1), tyrosine (824 the C-C stretching of the proline ring (926 the C-C stretching cm-1),”

  The Role of the Preanalytical Step for Human Saliva Analysis via Vibrational Spectroscopy DOI: 10.3390/metabo13030393
• Alkyl C-H আত্মবিশ্বাস 1.0

  “In order to perform semi-quantitative analyses, the peaks were normalised cm-1 using the peak located at ~824 attributed to the C-H deformation of the PPTA sequence aging duration.”

  Derombise 等 - 2009 - Degradation of Technora aramid fibres in alkaline DOI: 10.1016/j.polymdegradstab.2009.07.021
• Alkyl C-H আত্মবিশ্বাস 1.0

  “Figure 4: FTIR spectrum of as-received Technora T240 fibres cm-1 The peaks were normalised using the peak located at ~824 attributed to the C-H deformation of”

  Influence of finish treatment on the durability of aramid fibers aged under an alkaline environment DOI: 10.1002/app.31534
• C-S single bond আত্মবিশ্বাস 1.0

  “The peak cm-1 824 is responsible for the C-S stretching vibrations at 7.35 ppm (peak j) is attributed to the protons at position of thiophene structures.”

  Doan 等 - 2022 - Synthesis of Conjugated Molecules Based on Dithien DOI: 10.21577/0103-5053.20220031