Bronsted acid site — FTIR absorption peaks and assignments
These are the characteristic FTIR wavenumbers where Bronsted acid site tends to absorb, compiled from published literature and ranked by supporting evidence. Each assignment is traceable to a source (DOI) and cross-validated against our 130,000+ reference spectra and knowledge graph.
Backed by 8 cited sources
Quick answer
Bronsted acid site 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 Bronsted acid site
| Număr de undă (cm⁻¹) | Fapte suport | Surse citate | Încredere maximă |
|---|---|---|---|
| 1540 | 4 | 4 | 1,0 |
| 1545 | 4 | 2 | 1,0 |
| 1637 | 2 | 2 | 1,0 |
| 1533 | 1 | 1 | 1,0 |
| 402 | 1 | 1 | 1,0 |
| 1446 | 1 | 1 | 1,0 |
| 3630 | 1 | 1 | 1,0 |
| 3655 | 1 | 1 | 1,0 |
| 2159 | 1 | 1 | 1,0 |
| 2299 | 1 | 1 | 1,0 |
| 2170 | 1 | 1 | 1,0 |
| 3660 | 1 | 1 | 1,0 |
| 3610 | 1 | 1 | 1,0 |
| 1444 | 1 | 1 | 1,0 |
| 1400 | 1 | 1 | 1,0 |
| 2175 | 1 | 1 | 1,0 |
| 3590 | 1 | 1 | 1,0 |
| 3745 | 1 | 1 | 1,0 |
| 2297 | 1 | 1 | 1,0 |
| 2150 | 1 | 1 | 1,0 |
| 1425 | 1 | 1 | 1,0 |
| 2172 | 1 | 1 | 1,0 |
| 1640 | 1 | 1 | 1,0 |
| 673 | 1 | 1 | 1,0 |
| 1245 | 1 | 1 | 1,0 |
| 1680 | 1 | 1 | 1,0 |
| 1550 | 1 | 1 | 0,9 |
| 2277 | 1 | 1 | 0,9 |
| 1535 | 1 | 0 | 1,0 |
| 1445 | 1 | 0 | 1,0 |
Showing the 30 best-supported peaks of 32 total for Bronsted acid site.
Spectrum logic
A functional-group assignment becomes more reliable 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.
Literatura din spatele acestor atribuiri
-
1680 cm⁻¹ încredere 1,0
“Meanwhile, the peaks at 1467 4+)),20 s(NH while the two peaks at 3161 Brønsted acid sites ((cid:238) cm-1 weaken and remain until 473 K before and 1680 cm-1 and 3246 are attributed to s(NH 3) coordinated to Lewis (cid:238) cm-1 is disappear”
Pena 等 - 2004 - Identification of surface species on titania-suppo DOI: 10.1021/jp0313122 -
1640 cm⁻¹ încredere 1,0
“However, no significant peak at 1545 cm-1 nor at 1640 cm-1, corresponding to the vibrations characteristic of the pyridinium ions, formed in the presence of Brønsted acid sites, are clearly observed.”
TiO2 Catalyzed Dihydroxyacetone (DHA) Conversion in Water: Evidence That This Model Reaction Probes Basicity in Addition to Acidity DOI: 10.3390/molecules27238172 -
1540 cm⁻¹ încredere 1,0
“The typical bands resulting from pyridine adsorbed on Brønsted acid sites sites (PyH+) are observed around 1540 cm-1, while the bands from pyridine interacting with Lewis (PyH+ cm-1, ) are observed around 1540 while the bands from pyridine”
Bellmann 等 - 2020 - Determining the Location of Co2+ in Zeolites by UV DOI: 10.3390/catal10010123 -
1425 cm⁻¹ încredere 1,0
“They revealed that the number of cm-1) Brønsted acid sites (band near 1425 was strongly increased.”
Unravelling water effects on solid acidic catalysts: Case study of TiO 2 /SiO 2 for dehydration of isobutanol DOI: 10.1016/j.jcat.2016.12.007 -
2150 cm⁻¹ încredere 1,0
“The CO adsorption NMR spectroscopy is a reliable method for the quantification centers.11,47 15Nexperiments shown on the previous section do not give any of Lewis and Brønsted acid The adsorption of indication for these Brønsted acid sites,”
Comparative study of the strongest solid Lewis acids known: ACF and HS-AlF3 DOI: 10.1039/c8dt03279c -
2297 cm⁻¹ încredere 1,0
“LLM confirmed rule peak-group candidate”
New synthesis routes and catalytic applications of ferrierite crystals. Part 1: 1,8-Diaminooctane as a new OSDA DOI: 10.1016/j.micromeso.2019.109987 -
3590 cm⁻¹ încredere 1,0
“In the hierarchical catalysts Upon CO interaction at low temperature, the band due to cm-1 (80H and 30H), the band at 3590 is less evident due to the cm-1) Si(OH)Al Brønsted acid sites (3615 present in all catalysts”
Erigoni 等 - 2016 - Creating Accessible Active Sites in Hierarchical M DOI: 10.1038/ncomms9633. -
1400 cm⁻¹ încredere 1,0
“Under visible irradiation, a 3 cm-1 new broad band appeared at 1400 belonging to the asymmetric vibration of adsorbed 4+) NH 3on the Brønsted acid sites (formation of NH (Strömet al.”
Hamoud 等 - 2019 - Photo-assisted SCR over highly dispersed silver su DOI: 10.1016/j.apcatb.2019.02.022
See Bronsted acid site in your own spectrum
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