Nitrogen heterocycle — FTIR absorption peaks and assignments

Quick answer

Nitrogen heterocycle 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 Nitrogen heterocycle

Showing the 30 best-supported peaks of 188 total for Nitrogen heterocycle.

Possible materials

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

• 1566 cm⁻¹ confidence 1.0

  “1566cm-1, R2 due to NH in-plane bending, triazine stretching In every case a, good linear fit was obtained with valand C-N stretching, respectively, [23] and so, these bands ues >0.999.”

  Armenta 等 - 2004 - Determination of cyromazine in pesticide commercia DOI: 10.1016/j.aca.2004.02.063
• 3604 cm⁻¹ confidence 1.0

  “lowertemperaturethanthatat3604cm-1.Thisindicatesthat AE/H-BEA measured by pyridine adsorption method 3682cm-1 the OH group showing the peak at has weaker 3604cm-1.”

  Atoguchi 和 Kanougi - 2004 - Phenol oxidation over alkaline earth metal ion exc DOI: 10.1016/j.molcata.2004.08.020
• 810 cm⁻¹ confidence 1.0

  “The structure of the g-C 3N can be considered as 4 4 810cm-1 peak at graphite-like single layers aligned each other along the hexagonal can be attributed to the s-triazine (C 3N 3) breathing 1326-1433cm-1 1500-1627cm-1 c-axis[18].Theweakdif”

  Solvothermal synthesis of the special shape (deformable) hollow g-C3N4 nanospheres DOI: 10.1016/j.matlet.2011.01.008
• 1542 cm⁻¹ confidence 1.0

  “cm-1 613 The typical peaks at 1542 and 1468 attributed for the fundamental vibration of cm-1 pyrrole ring.”

  Highly Biological Active Antibiofilm, Anticancer and Osteoblast Adhesion Efficacy from MWCNT/PPy/Pd nanocomposite DOI: 10.1016/j.apsusc.2017.10.142
• 1039 cm⁻¹ confidence 1.0

  “Besides, cm-1 H bond in pyrrole ring [18], and the peaks at 1039 tion of N all the nanocomposites of PPy/ZnO show the better charge storage cm-1 3and 1173 were related to SO ion doped in PPy [4].”

  Structural and electrochemical study of polypyrrole/ZnO nanocomposites coating on nickel sheet synthesized by electrochemical method DOI: 10.1016/j.synthmet.2012.12.013
• 2230 cm⁻¹ confidence 1.0

  “The FTIR Accepted 14 September 2009 cm(cid:2)1 disappeared showed, with the curing reactionprogressed, the characteristic peak of nitrile at 2230 Available online 20 September 2009 cm(cid:2)1 and triazine ring at 1360 while the characterist”

  Synthesis and thermal properties of bisphthalonitriles containing aromatic ether nitrile linkages DOI: 10.1016/j.polymdegradstab.2009.09.006
• 1421 cm⁻¹ confidence 1.0

  “20.16 (cid:4) (cid:4) (cid:4) 21, 22, and The peaks at 900, 1068, plane modes, Electrochemical polymerization and reduction were percm-1 1091, and 1121 can be assigned to pyrrole in-plane 0.05M 0.1M formed in acetonitrile containing thiophe”

  Kato 等 - 2007 - X-ray photoemission spectroscopy and Fourier trans DOI: 10.1116/1.2731347
• 813 cm⁻¹ confidence 1.0

  “cm-1, cm-1 the absorption peak of the triazine ring at 813 and the absorption peak of the stretching cm-1 vibration P-O at 1088 [33].”

  Liang 等 - 2020 - Thermal Kinetics of a Lignin-Based Flame Retardant DOI: 10.3390/polym12092123