Nitro (NO2) — FTIR absorption peaks and assignments

Quick answer

Nitro (NO2) is usually assigned by looking for a recurring cluster of characteristic peaks rather than one exact textbook number. The table below shows where the literature most often places this group in FTIR, ranked by accumulated evidence.

Characteristic FTIR peaks for Nitro (NO2)

Showing the 30 best-supported peaks of 65 total for Nitro (NO2).

Spectrum logic

A functional-group assignment becomes more confident when several expected bands appear together. Use this page to find the strongest-supported peaks, then confirm that the same sample exhibits a coherent pattern rather than a single isolated hit.

Real-world usage

These pages are useful for unknown material analysis, peak explanation in reports, polymer troubleshooting, and verifying whether a candidate material family is chemically plausible.

Common mistakes

• Using one functional-group page as a complete material verdict without checking the rest of the spectrum.
• Assuming the strongest band is always the most diagnostic one.
• Forgetting that processing, additives, aging, and mixtures can shift or broaden expected peaks.

Verification advice

Use DSC, GC-MS, or TGA when several material families share similar bands or when mixture effects make the FTIR assignment uncertain.

Literature behind these assignments

• 1380 cm⁻¹ confidence 1.0

  “The peaks at 1380, 1529 tromagnetic spectrum, molecules undergo electronic tranindicates the presence of nitro compounds.”

  Synthesis of Phytonanocomposite of Zinc Oxide by Ixora coccinea Linn for Cancer Treatment DOI: 10.1007/s10904-016-0382-y
• 435 cm⁻¹ confidence 1.0

  “3,5 3,0 loss of 35.4% of the sample is presented with DTG peaks at 434.8 °C, AgNP+AH 2,5 and 476.7 attributed to the decomposition to NO 2,O and 2 °C, Ag.”

  Antimycotic nail polish based on humic acid‐coated silver nanoparticles for onychomycosis DOI: 10.1002/jctb.6676
• 1060 cm⁻¹ confidence 1.0

  “The new peak appeared at 1060 cm-1 after nitric acid modification was assigned to the presence of asymmetric NO2 stretch vibration that confirm carbon surface modification [41].”

  Elkady 等 - 2020 - New Activated Carbon from Mine Coal for Adsorption DOI: 10.3390/ma13112498
• 1533 cm⁻¹ confidence 1.0

  “The peak at 1533 is caused by N-O stretching of aromatic nitro cm-1 compounds, the peak at 1386 is caused by symmetric carboxylate stretching, and the peak at 1327 is caused by N-O asymmetric stretching and reveals the presence of a nitro c”

  Nematicidal activity of seaweed-synthesized silver nanoparticles and extracts against Meloidogyne incognita on tomato plants DOI: 10.1038/s41598-022-06600-1
• 614 cm⁻¹ confidence 1.0

  “were present in both FTIR spectra of plant extract and FeNPs, such as alkyl halides, alkynes, aromatics and aliphatic amines, esters, ethers, alcohol, carboxylic acids, and nitro Nanomaterials2022,12,2404 11of25 compounds with peaks at 526.”

  Green Synthesis and Characterization of Iron Nanoparticles Synthesized from Aqueous Leaf Extract of Vitex leucoxylon and Its Biomedical Applications DOI: 10.3390/nano12142404
• 1409 cm⁻¹ confidence 1.0

  “5) showed six peaks which indicate the pres1409.02 is assigned to N=O bending nitro groups.”

  Ragavendran 和 Natarajan - 2015 - Insecticidal potency of Aspergillus terreus agains DOI: 10.1007/s11356-015-4961-1
• 3441 cm⁻¹ confidence 1.0

  “of 1.121 min and 2.029 min indicate 1,3-propanediol, 2-methyl-2cm-1 Peak at 3441 corresponds to asymmetric stretching vibration nitro-, dinitrate and 1,2,3-propanetriol, 1,3-dinitrate, respectively.”

  Shareef 和 Bhavya - 2021 - Extraction, phytochemical analysis and in silico a DOI: 10.21276/ap.2021.10.2.59
• 836 cm⁻¹ confidence 1.0

  “The latter is apparent from the subsequent increase in γ = WSR cm-1, A the peak area at 836 which represents the signal of nitrate - (1) ν - NO 2 3 ions in the crystal state.”

  Zhang 等 - 2014 - In Situ Observation on the Dynamic Process of Evap DOI: 10.1021/jp412073c