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Nitro-aromatic maleimide

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Result No.: 20260614210715434455688 Owner: 美丽鸭脖王 Comments: 0

FTIR ANALYSIS REPORT

FTIR Spectrum Analysis Report

No.: 20260614210715434455688 Date: 2026-06-16 12:19:45 Reported by: FTIR.fun Contact: [email protected]

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Top15

Similarity-ranked Top-15 library comparison

Library spectrum will appear here.

Infrared spectrum comparison chart. Analysis result: Nitro-aromatic maleimide.

The spectrum is most consistent with a nitro-substituted aromatic maleimide derivative, specifically 1-(4-nitrophenyl)pyrrole-2,5-dione (library match 1, similarity 0.66). The carbonyl region exhibits an imide-characteristic doublet at 1724 and 1740 cm⁻¹, while the aromatic substitution pattern (724, 747, 830, 1550, 1613 cm⁻¹) suggests a para-disubstituted benzene ring. The band at 1550 cm⁻¹ may also contain the asymmetric NO₂ stretch, in agreement with the nitro group present in all top library candidates. Library confidence is moderate; related nitrobenzaldehydes and dinitroaromatics cannot be excluded, but the double carbonyl pattern strongly favors a cyclic imide

Library spectrum Interactive sample curve Move the pointer to show the vertical guide line.

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

Nitro-aromatic maleimide

Moderate confidence

Conclusion

The library top candidate 1-(4-nitrophenyl)pyrrole-2,5-dione (spectrum #11132) matches the carbonyl pattern and aromatic substitution.
The reference interpretation of the sample also notes a prominent carbonyl band with companion and a set of aromatic ring modes.
The 1724/1740 cm⁻¹ pair, with a separation of about 16 cm⁻¹, is typical of five-membered cyclic imides (maleimide) and argues against a simple ester or monocarboxylic acid.

Evidence

Key evidence

Library lead candidate

1-(4-nitrophenyl)pyrrole-2,5-dione #11132

Limitations

Evidence that limits the conclusion

Library similarity is moderate (0.66–0.71) and the Top-1 margin is small; the sample could also be a mixture of nitroaromatic carbonyl compounds or contain a related structure (e.g., nitrobenzaldehyde, dinitrobenzoic acid).

Recommendation

Suggested next verification

Confirm the identity by mass spectrometry (EI or ESI) to obtain molecular ion and fragmentation pattern.
Compare the IR spectrum with an authentic reference of 1-(4-nitrophenyl)pyrrole-2,5-dione; verify the presence of the imide C=O doublet and the exact positions of the aromatic out-of-plane bands.
Test for the absence of aldehyde C–H stretching near 2850–2750 cm⁻¹ to help exclude nitrobenzaldehyde candidates.

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	★	1724	1.00	Literature-supported assignment	The band at 1724 cm-1 is assigned to imide.	[1]	Moderate confidence
2	·	1351	0.69	-	-	-	-
3	·	1550	0.34	-	-	-	-
4	·	1199	0.32	-	-	-	-
5	·	747	0.31	-	-	-	-
6	·	861	0.24	-	-	-	-
7	·	830	0.23	-	-	-	-
8	·	724	0.23	-	-	-	-
9	★	1613	0.18	Literature-supported assignment	The band at 1613 cm-1 is assigned to aromatic ring vibration.	[2]	High confidence
10	·	1335	0.12	-	-	-	-
11	·	1117	0.08	-	-	-	-
12	·	1021	0.08	-	-	-	-
13	·	1296	0.07	-	-	-	-
14	·	688	0.07	-	-	-	-
15	·	2841	0.06	-	-	-	-
16	·	2778	0.05	-	-	-	-
17	·	3088	0.05	-	-	-	-
18	·	517	0.04	-	-	-	-
19	·	545	0.04	-	-	-	-
20	★	1740	0.04	Literature-supported assignment	The band at 1740 cm-1 is assigned to C=O.	[3]	Moderate confidence

Literature

References

No.	Title	DOI	Page
[1]	Ha 等 - 1998 - Polarized Infrared Spectroscopic Studies of Polari	10.1080/10587259808025380	-
[2]	Garcia-Fuentevilla 等 - 2023 - Enzyme-Catalyzed Polymerization of Kraft Lignin fr	10.3390/polym15030513	11
[3]	Mijatovic 等 - 2017 - Analysis of pulmonary surfactant by Fourier transf	10.17305/bjbms.2016.1680	3

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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:

Discussion

Comments and follow-up evidence

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Nitro-aromatic maleimide

Similarity-ranked Top-15 library comparison

Reference library candidates

Nitro-aromatic maleimide

Key evidence

Evidence that limits the conclusion

Suggested next verification

Detected peaks and interpretation

References

Need a formal reviewed report instead of the standard result page?

Sample information and raw spectrum

Comments and follow-up evidence

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