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nitrogen-containing heteroaromatic ring compound

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結果編號: 20241208210911330625067 擁有者: publicuser 評論: 0
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FTIR ANALYSIS REPORT

FTIR Spectrum Analysis Report

No.: 20241208210911330625067 Date: 2024-12-08 13:11:26 Reported by: FTIR.fun Contact: [email protected]

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Top15

Similarity-ranked Top-15 library comparison

Choose matching result groups:
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Top 15 candidates

Reference library candidates

Rank Match % Compound Name Formula / SMILES Library preview Action
Reference candidates load with this Top-15 workbench.

Based on the library matches and evidence above.

Conclusion

nitrogen-containing heteroaromatic ring compound

General assessment
-
#23573 Initial rank 1 Current rank 1 Library lead match 0.0%
Conclusion
  1. Top-ranked library candidates include 1,2-thiazole and thiophene-type compounds, indicating a recurring heteroaromatic ring pattern in the search results.
  2. The sample contains multiple bands in the 1600–1500 cm⁻¹ region, which are compatible with aromatic or conjugated ring vibrations.
  3. A band at 3325 cm⁻¹ is consistent with possible N-H involvement and supports a broad nitrogen-containing direction.
Main limitation

All reported library similarities are 0.0, so the apparent hit to 1,2-thiazole is not a reliable direct identification.

Evidence & interpretation
Evidence

Key evidence

資料庫主要匹配
1,2-thiazole #23573 | match 0.0%
材料方向
nitrogen-containing heteroaromatic ring compound The FTIR search does not support a firm compound-level identification for this sample. The nearest library hit is 1,2-thiazole, but all reported library similarities are effectively zero, so this should not be treated as a direct match. The more defensible conclusion is a broad material direction toward a nitrogen-containing heteroaromatic ring compound. This direction is based mainly on the Top-15 library pattern, which repeatedly includes sulfur- and nitrogen-containing aromatic ring systems such as thiazole and thiophene derivatives, together with the sample bands in the 1607–1520 cm⁻¹ region that are consistent with ring stretching vibrations and a band at 3325 cm⁻¹ that may indicate an N-H-containing functionality. However, there is no direct reference or related-literature evidence confirming a narrower assignment, and the spectrum does not provide enough uniquely identifying bands to justify naming a specific molecule.
Support

Evidence supporting the conclusion

Only sample-relevant statements that support the present conclusion are shown here.

  1. The FTIR search does not support a firm compound-level identification for this sample. The nearest library hit is 1,2-thiazole, but all reported library similarities are effectively zero, so this should not be treated as a direct match. The more defensible conclusion is a broad material direction toward a nitrogen-containing heteroaromatic ring compound. This direction is based mainly on the Top-15 library pattern, which repeatedly includes sulfur- and nitrogen-containing aromatic ring systems such as thiazole and thiophene derivatives, together with the sample bands in the 1607–1520 cm⁻¹ region that are consistent with ring stretching vibrations and a band at 3325 cm⁻¹ that may indicate an N-H-containing functionality. However, there is no direct reference or related-literature evidence confirming a narrower assignment, and the spectrum does not provide enough uniquely identifying bands to justify naming a specific molecule.
  2. Top-ranked library candidates include 1,2-thiazole and thiophene-type compounds, indicating a recurring heteroaromatic ring pattern in the search results.
  3. The sample contains multiple bands in the 1600–1500 cm⁻¹ region, which are compatible with aromatic or conjugated ring vibrations.
  4. A band at 3325 cm⁻¹ is consistent with possible N-H involvement and supports a broad nitrogen-containing direction.
  5. Fingerprint-region bands between 1005 and 1151 cm⁻¹ are compatible with heteroatom-influenced ring vibrations, although not uniquely so.
  6. The sample shows bands at 1607, 1587, and 1520 cm⁻¹, consistent with unsaturated or aromatic ring-associated vibrations.
  7. The 3325 cm⁻¹ band is compatible with an N-H-containing functionality, which is broadly consistent with the library direction toward nitrogen-containing heterocyclic chemistry.
  8. Bands at 721, 735, 775, 852, and 872 cm⁻¹ support the presence of substituted ring or out-of-plane deformation features, but they are not specific enough to assign a single structure.
  9. The Top-15 library pattern repeatedly includes heteroaromatic sulfur/nitrogen ring candidates such as 1,2-thiazole, thiophene, and thiophene-2-carbonitrile, which supports a broad heteroaromatic direction rather than a specific entity.
Limitations

Evidence that limits the conclusion

  • All reported library similarities are 0.0, so the apparent hit to 1,2-thiazole is not a reliable direct identification.
  • The leading candidates are chemically mixed, including sulfur heterocycles, nitriles, halogenated compounds, and aromatic salts, which indicates weak retrieval coherence.
  • The sample does not show strong, uniquely identifying evidence for a specific thiazole, thiophene, nitrile, halogenated compound, or quaternary ammonium salt.
  • No direct literature match or confirming reference interpretation is available for this sample.
  • It remains unclear whether the 3325 cm⁻¹ band is due to N-H stretching, weak moisture contribution, or another hydrogen-bonded functionality.
  • The current evidence does not distinguish securely between nitrogen-containing heteroaromatic material and a broader aromatic heterocycle-containing mixture.
  • The spectrum lacks corroborating reference evidence needed to determine whether sulfur is truly present in the sample or only reflected in weak library analogs.
Recommendation

Suggested next verification

  • Re-measure the sample with improved background control and higher signal-to-noise, paying particular attention to the 3325 cm⁻¹ region to confirm whether N-H is genuinely present.
  • Check for complementary evidence from Raman spectroscopy or mass spectrometry to distinguish nitrogen heteroaromatic compounds from sulfur heteroaromatic analogs.
  • If available, compare against authenticated FTIR reference spectra for 1,2-thiazole, thiophene, and related nitrogen-containing heteroaromatic compounds under the same measurement conditions.
  • If the sample is soluble, consider GC-MS or LC-MS to determine whether the material is a single heteroaromatic compound or a mixture.
Peak analysis

Detected peaks and interpretation

★ = Literature-supported peak assignment.

Index Characteristic Wavenumber Absorbance Evidence One-line interpretation Citation Confidence
1 · 721 1.00 - - - -
2 · 852 0.82 - - - -
3 · 1434 0.47 - - - -
4 · 872 0.34 - - - -
5 · 1520 0.32 - - - -
6 · 3325 0.25 - - - -
7 · 775 0.24 - - - -
8 · 1105 0.19 - - - -
9 · 1151 0.19 - - - -
10 · 1587 0.18 - - - -
11 · 928 0.18 - - - -
12 · 735 0.17 - - - -
13 · 1005 0.16 - - - -
14 · 1607 0.15 - - - -
15 · 1627 0.14 - - - -
16 · 1037 0.11 - - - -
17 · 1494 0.10 - - - -
Appendix

Sample information and raw spectrum

Original uploaded spectrum for reference and verification.

Baseline correction method: Asymmetric Least Squares Smoothing

The wavelength range for analysis(cm-1): [(650, 4000)]

Raw spectrum without baseline correction or other processing:

Sample spectrum image
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