N eq o — FTIR absorption peaks and assignments

Quick answer

N eq o 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 N eq o

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

• 1384 cm⁻¹ confidence 1.0

  “The band at 1384 is indicative of the N=O stretching vibration that was produced by the trace amount of nitrate [38].”

  Miri 和 Sarani - 2018 - Biosynthesis, characterization and cytotoxic activ DOI: 10.1016/j.ceramint.2018.04.063
• 1384 cm⁻¹ confidence 1.0

  “The cm-1 could be due to N=O stretching vibration indicating traces of nitrate sharp band at 1384”

  Patil 等 - 2016 - Bio-therapeutic Potential and Cytotoxicity Assessm DOI: 10.1007/s12010-016-2121-9
• 1409 cm⁻¹ confidence 1.0

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

  Insecticidal potency of Aspergillus terreus against larvae and pupae of three mosquito species Anopheles stephensi, Culex quinquefasciatus, and Aedes aegypti DOI: 10.1007/s11356-015-4961-1
• 838 cm⁻¹ confidence 1.0

  “The band cm-1 observed at 1277 is associated with C-N stretching, cm-1, and the two distinct bands occur at 838 and cm-1 639 related to the C-C ring and C-N=O bending,”

  Effects of polyvinylpyrrolidone on structural and optical properties of willemite semiconductor nanoparticles by polymer thermal treatment method DOI: 10.1007/s10973-018-7874-7
• 502 cm⁻¹ confidence 1.0

  “1,502cm-1 appeared due to asymmetric N=O stretch.”

  Design, Synthesis, Characterization, and Computational Studies on Benzamide Substituted Mannich Bases as Novel, Potential Antibacterial Agents DOI: 10.1155/2014/732141
• 1505 cm⁻¹ confidence 1.0

  “The peak observed at 1612 attributed to N-H bending vibrations of alkenes, primary amines, and amides, and the peak cm-1 can be attributed to N-H bending vibrations of alkenes, primary amines, and amcm-1 at 1505 can be assigned to N=O stret”

  Eucalyptus globulus and Salvia officinalis Extracts Mediated Green Synthesis of Silver Nanoparticles and Their Application as an Antioxidant and Antimicrobial Agent DOI: 10.3390/plants11081085
• 750 cm⁻¹ confidence 1.0

  “FTIR data revealed that Ery-PLGA nanoparticles' peaks at around 3650 cm-1 and 3000 cm-1, attributed to O-H stretching vibrations, at 1760 cm-1 to C=O stretch, at 1460 cm-1 assigned to C-H link, at 1400 cm-1 to N=O binding, 1180 cm-1 and 109”

  Nano-Architectonics of Antibiotic-Loaded Polymer Particles as Vehicles for Active Molecules DOI: 10.3390/app12041998
• 1490 cm⁻¹ confidence 1.0

  “The peaks at 1490 and 1313 cm-1 are attributed to the N=O stretching vibrations of the coordinated nican be assigned to Zntrate group and the nitrate ion, respectively.”

  Deposition of Zinc Oxide Coatings on Wood Surfaces Using the Solution Precursor Plasma Spraying Process DOI: 10.3390/coatings11020183