Metal hydroxyl — FTIR absorption peaks and assignments

Quick answer

Metal hydroxyl 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 Metal hydroxyl

Showing the 30 best-supported peaks of 143 total for Metal hydroxyl.

Spectrum logic

A functional-group assignment becomes more confident 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.

Literature behind these assignments

• 1300 cm⁻¹ confidence 1.0

  “Finally, absorption bands between 1300 and are assigned to the combination of stretch and bend vibrations of Si (or Al)-O framework and octahedral M-OH (M means metal element).”

  Cai 等 - 2007 - A Fourier transform infrared spectroscopic study o DOI: 10.1016/j.saa.2006.02.053
• 3390 cm⁻¹ confidence 1.0

  “LLM confirmed rule peak-group candidate”

  Dahham 等 - 2018 - Studies of ENR-25TiO2 Composites for Electronic M DOI: 10.1088/1742-6596/1019/1/012054
• 3455 cm⁻¹ confidence 1.0

  “LLM confirmed rule peak-group candidate”

  Dahham 等 - 2018 - Synthesis and structural studies of an epoxidized DOI: 10.1016/j.polymertesting.2017.11.005
• 2272 cm⁻¹ confidence 1.0

  “3(OH)2972 As-O vibration Asymmetric stretch of As-O AsO 2272 Al-OH vibration OH stretching for basic hydroxyl groups from Al-OH Al(OH) Al(III) 3 2O 2388”

  The effect of electrocoagulation (EC) on total arsenic, arsenite (As3+) and arsenate (As5+) species removal from model groundwater investigating toxicity and sludge characteristic DOI: 10.1007/s13201-022-01660-0
• 920 cm⁻¹ confidence 1.0

  “data.33-35 cm-1 The shoulder at 831 is due to the stretching cm-1 Al-O mode, whereas the band near 920 is tentatively Al-OH Alassigned as a mixed modes arising from stretch, O-Al Si-O-Si Si-O-Al vibration, and and stretching”

  Fali 等 - 2021 - Nanoscale Spectroscopy of Dielectric Properties of DOI: 10.1021/acsphotonics.0c00951
• 912 cm⁻¹ confidence 1.0

  “Absorption bands cm-1 at 911.6, 912.5, 910.6, 912.2, 910.6 and 911.8 assigned to the Al-OH vibrations [40].”

  Unique Halloysite Nanotubes–Polyvinyl Alcohol– Polyvinylpyrrolidone Composite Complemented with Physico–Chemical Characterization DOI: 10.3390/polym9060207
• 471 cm⁻¹ confidence 1.0

  “cm-1 1635 3433 and 3749 Ammoand 2018), then the wavenumber of 470.63 cm-1 denoted as the Al-Al-OH vibrations nium ions have inserted inside the layer of ben532.35 cm-1 due to has bet- (Zaher MS et al., 2018).”

  Hakim 等 - 2023 - Ammonium-Assisted Intercalation of Java Bentonite DOI: 10.12911/22998993/156665
• 907 cm⁻¹ confidence 1.0

  “The peak at 907 observed only in HNT FTIR spectra is attributed to Al-OH bonding which does not appear in CTS (due to absence of Al) and also disappeared in CTS-Si/HNT nanocomposite due to the breaking of Al-OH bonding after when CTS-Si is”

  Synthesis and Optimization of Superhydrophilic-Superoleophobic Chitosan–Silica/HNT Nanocomposite Coating for Oil–Water Separation Using Response Surface Methodology DOI: 10.3390/nano12203673