What absorbs at 3232 cm⁻¹ in an FTIR spectrum?
A band near 3232 cm⁻¹ can point to several functional groups. Below are the most likely assignments, ranked by how much published evidence supports each — every one traceable to literature (DOI) and cross-validated against our 130,000+ reference spectra and knowledge graph.
Backed by 8 cited sources
Quick answer
A band near 3232 cm⁻¹ is usually interpreted by checking which functional groups repeatedly co-occur there in the literature, then confirming at least one or two additional peaks in the same sample. This page ranks those assignments by accumulated evidence rather than by a single fixed textbook rule.
Возможные назначения функциональных групп
| Функциональная группа | Подтверждающие факты | Цитируемые источники | Максимальная достоверность |
|---|---|---|---|
| Carbonate | 3 | 3 | 1,0 |
| Secondary amine | 2 | 2 | 1,0 |
| N h | 2 | 2 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Nitro (NO2) | 1 | 1 | 1,0 |
| Fluorine (C-F) | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Metal hydroxyl | 1 | 1 | 0,9 |
Ранжирование отражает накопленные литературные данные, а не единственное авторитетное правило. Всегда проверяйте в контексте вашего образца.
Possible materials
| Материал | Поддерживающие пики | Overlapping groups | Цитируемые источники |
|---|---|---|---|
| diamond | 3232, 1378, 1332 | Secondary amine, Methoxy (OCH3) | 1 |
| calcium carbonate | 3232, 2954, 1320 | Carbonate, Methoxy (OCH3) | 1 |
Materials are shown only when the same literature pool supports this band and at least one additional characteristic peak.
Spectrum logic
This band becomes meaningful only when read with its neighboring peaks. In practice, analysts first look at the assignments above, then check whether the same sample also shows other peaks expected for the same structural motif. A lone band near 3232 cm⁻¹ is usually not enough for material identification by itself.
Real-world usage
This type of query is common in polymer identification, unknown plastic screening, QC troubleshooting, recycled-material verification, and literature-backed peak assignment review.
Common mistakes
- Treating one isolated band as proof of a material without checking at least one or two supporting peaks.
- Ignoring overlap: multiple functional groups can contribute near the same wavenumber.
- Skipping validation when additives, blends, oxidation, or contamination may distort the spectrum.
Verification advice
When ambiguity remains, validate the hypothesis with DSC, GC-MS, or TGA, especially for blends, degraded samples, and filled polymers.
Литература, лежащая в основе этих назначений
-
Hydroxyl (O-H) достоверность 1,0
“These features dominant peak at 3309 with two subordinate peaks at 3232 and 3184 These were revealed by FTIR analysis and were found to be related to the structural OH groups features were revealed by FTIR analysis and were found to be rela”
Wang 和 Takahashi - 2023 - Development of Mid-Infrared Absorption Spectroscop DOI: 10.3390/min13050625 -
достоверность 1,0
“complex, the same bands were observed at 3232 and Our results revealed that L1, Pt(II)L1 and Pt(II)L2 had cm(cid:2)1 3136 which shifts to lower frequency by 128 and a cytotoxic effect on the human retinoblastoma cell line cm(cid:2)1 53 as c”
Synthesis and in vitro activity of platinum(II) complexes of two fluorenylspirohydantoins against a human tumour cell line DOI: 10.1080/13102818.2014.910363 -
Carbonate достоверность 1,0
“42significant the FTIR spectrum shows the powder material to be dehyAs no other HPO peaks were observed in the droxylated (due to the diminished OHpeaks) and conFTIR spectra for the HAp powder, it would be suggested 3232cm-1 taining carbona”
The deposition of strontium and zinc Co-substituted hydroxyapatite coatings DOI: 10.1007/s10856-017-5846-2 -
N h достоверность 1,0
“General procedure for the synthesis of 7-hydroxy-4-phenylquinoline cm(cid:2)1): 3462.01, 3376.59, 3336.67 (NH2, hexane (7:3)), FTIR (KBr disc, derivatives (5a-o) (C(cid:3)N), NH stretch), 3231.58, 3186.68, 3066.43 (Ar CH), 2192.36”
7-Hydroxy-4-phenyl-1, 2-dihydroquinoline derivatives: synthesis via one-pot, three-component reaction and structure elucidation DOI: 10.1016/j.heliyon.2020.e05035 -
N h достоверность 1,0
“215(cid:3)C 218(cid:3)C, 13C-NMR 2), 4.58 (s, 1H, Hd), (75 MHz, DMSOOff white solid, Yield: 65%, m.p: to Rf: 0.69 2H, NH cm-1): δ n-hexane 6) 160.9(C4), 149.3 (C7, C6), 146.1 (C14), 131.6 (C12), d [Acetone: (7:3)], FTIR (KBr disk, 129.9 (C1”
Development of an Efficient, One-Pot, Multicomponent Protocol for Synthesis of 8-Hydroxy-4-Phenyl-1,2-Dihydroquinoline Derivatives DOI: 10.1002/jhet.4193 -
Carbonate достоверность 1,0
“The main calcite bands are centered The 3232at ~2514 [ν1 (CO results of enzymatic analyses also denied the presence of sucrose in symmetric stretching) + ν3 (CO asymmetric”
Zhang 等 - 2020 - CONTRIBUTION OF ENZYMATIC METHOD FOR ANALYZING SUC DOI: 10.21577/0100-4042.20170561 -
Carbonate достоверность 1,0
“Herit Sci (2021) 9:4 Page 9 of 15 Table 6 FTIR band assignment of calcite, tile dust and sticky rice powder (cm-1) Wavenumber Band assignment 3232symmetric stretching) ν3 (CO asymmetric stretching) and/or 2ν2 (O-C-O out-of-plane Calcite ~ 2”
Zhang 等 - 2021 - Effects of sticky rice addition on the properties DOI: 10.1186/s40494-020-00475-z -
Metal hydroxyl достоверность 0,9
“Side peaks at 3232 and 3185 are part of the 3309 cm-1 series assigned as -Ti-OH stretching.”
Phlayrahan 等 - 2018 - Fe oxidation state in heat-treated basaltic blue s DOI: 10.1088/1742-6596/1144/1/012057
Есть спектр с этой полосой?
Загрузите свой FTIR-спектр и получите полный отчет об интерпретации — назначение пиков с цитированием литературы, совпадения с библиотекой и цепочку доказательств с оценкой достоверности — за секунды.