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RESULT PAGE

secondary amine / n h

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Result No.: 20260614005046286824186 Owner: isha Comments: 0
FTIR ANALYSIS REPORT

FTIR Spectrum Analysis Report

No.: 20260614005046286824186 Date: 2026-06-13 19:34:51 Reported by: FTIR.fun Contact: [email protected]

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Top15

Similarity-ranked Top-15 library comparison

Library spectrum will appear here.
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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

secondary amine / n h

High confidence
Conclusion
  1. The reference library comparison lists diazanium;sulfate as the top match and repeatedly returns secondary amine / n‑h functional groups among the leading candidates, indicating a nitrogen‑rich composition.
  2. Literature‑based peak assignments at 420, 433, and 449 cm−1 for amide and amine‑like vibrations in polymeric or biological matrices provide independent support for nitrogen‑containing functional groups.
  3. The absorptions at 2884 and 2982 cm−1 are consistent with aliphatic C–H stretching, indicating organic hydrogen‑bearing chains.
Evidence & interpretation
Evidence

Key evidence

Library lead candidate
diazanium;sulfate #142761
Limitations

Evidence that limits the conclusion

  • The related‑literature interpretation describes a cellulose‑like polysaccharide backbone with C–O–C/ring modes, carbonyl, and carboxylate functionalities, which is inconsistent with a pure ammonium sulfate identification.
  • The low library similarity (0.659) and small lead gap (0.059) among the top candidates show that the spectral database alone does not confidently resolve the material.
  • The sample may be a mixture of inorganic amine/ammonium salts and organic biopolymer or carbohydrate; the observed spectral contradictions cannot be resolved without supplementary data.
  • Assignments of many low‑wavenumber peaks to metal‑oxygen or silicate‑like species in the literature are chemically incompatible with the primary amine/ammonium direction, suggesting that those features may originate from minor components or are artefacts of the library search.
Recommendation

Suggested next verification

  • Compare the spectrum directly with a reference of diazanium;sulfate (ammonium sulfate) and, if possible, with ammonium carboxylate salts to assess the contribution of the carbonyl/carboxylate bands.
  • Employ hyphenated techniques such as TGA‑FTIR or pyrolysis‑GC‑MS to detect organic volatiles and confirm the presence of polysaccharide or amine decomposition products.
  • Determine elemental composition by CHNS analysis to verify the nitrogen and sulfur content, clarifying whether the material is predominantly an ammonium salt or an organic amine.
Peak analysis

Detected peaks and interpretation

★ = Literature-supported peak assignment.

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Index Characteristic Wavenumber Absorbance Evidence One-line interpretation Citation Confidence
1 ★ 1394 0.70 Literature-supported assignment The band at 1394 cm-1 is assigned to carboxylic c. [5] Low confidence
2 · 609 0.61 - - - -
3 · 420 0.49 - - - -
4 · 2039 0.48 - - - -
5 ★ 1072 0.39 Literature-supported assignment The band at 1072 cm-1 is assigned to C-O stretching in glucopyranose ring. [4] Low confidence
6 · 2649 0.38 - - - -
7 · 1896 0.36 - - - -
8 ★ 1014 0.35 Literature-supported assignment The band at 1014 cm-1 is assigned to C-O vibration. [3] Low confidence
9 · 1952 0.33 - - - -
10 · 2982 0.33 - - - -
11 ★ 2884 0.30 Literature-supported assignment The band at 2884 cm-1 is assigned to ch3. [7] Low confidence
12 · 1590 0.29 - - - -
13 · 449 0.27 - - - -
14 · 884 0.21 - - - -
15 · 676 0.21 - - - -
16 · 2188 0.21 - - - -
17 ★ 927 0.21 Literature-supported assignment The band at 927 cm-1 is assigned to d glucopyranosyl ring. [1] Low confidence
18 ★ 1707 0.16 Literature-supported assignment The band at 1707 cm-1 is assigned to C=O. [6] Low confidence
19 · 525 0.16 - - - -
20 · 433 0.16 - - - -
21 · 829 0.12 - - - -
22 · 462 0.11 - - - -
23 · 2149 0.11 - - - -
24 ★ 3680 0.07 Literature-supported assignment The band at 3680 cm-1 is assigned to water. [2] Moderate confidence
25 · 3726 0.06 - - - -
Literature

References

No. Title DOI Page
[1] Zeng 等 - 2011 - Comparison of A and B Starch Granules from Three W 10.3390/molecules161210570 -
[2] Muller 等 - 2004 - Interactions of water and methanol with MeAPO-5. F 10.1016/j.micromeso.2003.12.025 -
[3] Combrzynski 等 - 2022 - Selected Physical and Spectroscopic Properties of 10.3390/ma15145061 11
[4] Oberlintner 等 - 2023 - Effect of Environment on Acetylated Cellulose Nano 10.3390/polym15071663 8
[5] Eduah 等 - 2020 - Mechanism of orthophosphate (PO4-P) adsorption ont 10.1016/j.eti.2019.100572 4
[6] Hamza 等 - 2023 - A Phosphonic Functionalized Biopolymer for the Sor 10.3390/su15032843 7
[7] Combrzynski 等 - 2020 - Potato Starch Utilization in Ecological Loose-Fill 10.3390/ma13061390 15
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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): [(400, 4000)]

Raw spectrum without baseline correction or other processing:

Sample spectrum image
Discussion

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