C#c — FTIR absorption peaks and assignments

Quick answer

C#c 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 C#c

Showing the 30 best-supported peaks of 72 total for C#c.

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

• 2045 cm⁻¹ confidence 1.0

  “The peak at 2368.59 2222.00 of antioxidant potential of tested cm-1 and 2044.54 show C≡C stretching.”

  Bawazeer 等 - 2021 - Synthesis, Characterization and Bioactivity Profil DOI: 10.22207/JPAM.15.2.11
• 1443 cm⁻¹ confidence 1.0

  “LLM confirmed rule peak-group candidate”

  Characterization of short-length multi-walled carbon nanotubes and cytotoxicity on MDA-MB-231 and HUVEC cell lines DOI: 10.1007/s42823-019-00081-5
• 1451 cm⁻¹ confidence 1.0

  “1450.86cm-1 1541.57, related to be alkynes (monosubstituted) group, σ alkanes group, carboxylic acid dimer, hydroxyl aryl ketones, nitro compounds, tertiary ammonium ions.”

  Novel approach to synthesis silver nanoparticles using plant pathogenic fungi, Puccinia graminis DOI: 10.1016/j.matlet.2012.04.103
• 2300 cm⁻¹ confidence 1.0

  “LLM confirmed rule peak-group candidate”

  Kundu 等 - 2018 - Synthesis and characterization of iron and copper DOI: 10.1063/1.5051300
• 2123 cm⁻¹ confidence 1.0

  “cm-1 cm-1 Weak and broad peak at 2123.44 and 2123.58 were observed due to C≡C stretching of cm-1 monosubstituted alkynes present in EFY starch.”

  Nagar 等 - 2019 - Influence of xanthan and agar-agar on thermo-funct DOI: 10.1016/j.ijbiomac.2019.06.133
• 2879 cm⁻¹ confidence 1.0

  “cm-1 and 2611.01 >3000 (Medium) Alkane (C-H Stretching) 2715.39 2879.43cm-1 and2868.32cm-1 ±2860cm-1 Alkane(C-HStretching) (Medium) 2210.28cm-1 ±2200cm-1 Alkyne(C≡CStretching) (Medium) cm-1 cm-1 2935.05 ±2935 (Medium) Alkane (C-H Stretching”

  Validation of the Developed Zero-Order Infrared Spectrophotometry Method for Qualitative and Quantitative Analyses of Tranexamic Acid in Marketed Tablets DOI: 10.3390/molecules26226985
• 2920 cm⁻¹ confidence 1.0

  “Furthermore, the peak at 2920.32 is ascribed to C-H cm-1 which is likely to correspond to C≡C stretch of the alkyl group, the peak around 2360.95 cm-1 from alkyne and the peak at 1635.69 suggested conjugation effects of C=O stretching of ca”

  Oladipo 等 - 2020 - Characterization and biomedical application of phy DOI: 10.1088/1757-899X/805/1/012021
• 3261 cm⁻¹ confidence 1.0

  “The absorption peaks of FTIR are contained of cm-1, cm-1, cm-1, cm-1 3261 2136 1635 and 1230 peaks that are assigned and fitted to C≡C, O-H, C=C, and C-O-H/O-H, respectively [20,21].”

  Surface Enhanced Raman Scattering in Graphene Quantum Dots Grown via Electrochemical Process DOI: 10.3390/molecules26185484