What absorbs at 864 cm⁻¹ in an FTIR spectrum?
A band near 864 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 5 cited sources
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Carbonate | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| Bromine | 1 | 1 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
Alkene (C=C) confidence 1.0
“cm-1 In the bands at 3009 in the reaction with IA (Figure 5b), the peak referring to cm-1 the double bond disappeared, promoting a stretching at 864 (Figure 6) and resulting”
Montenegro 等 - 2023 - Enzymatic and Synthetic Routes of Castor Oil Epoxi DOI: 10.3390/polym15112477 -
Bromine confidence 1.0
“cm-1 The bands at 864 and 861 were assigned as C14HOOP in SRII (Figure 4c) and BR-T (d), respectively, the presence of which is highly correlated with negative pho- (28).”
Suzuki 等 - 2008 - Structural Changes of Salinibacter Sensory Rhodops DOI: 10.1021/bi801358b -
Carbohydrate confidence 1.0
“The presence of absorption peaks at about 3733, 3500, 3492, 2920, 2826, 1946, 1536, 1372, and 864 cm-1 were associated with the representative functional groups of cellulose [53,54].”
Characterizations of Alpha-Cellulose and Microcrystalline Cellulose Isolated from Cocoa Pod Husk as a Potential Pharmaceutical Excipient DOI: 10.3390/ma15175992 -
Hydroxyl (O-H) confidence 1.0
“• Stretching vibrations of C-O bonds in COOH [21] Arenesovertonesduetomono-substitution(689cm-1 1905-1699 1905-1699 * • band)metadi-substitution(864cm-1 band) • O-H group in absorbed molecules of water and/or structural molecules of water o”
The Origin and Physico-Chemical Properties of Some Unusual Earth Rock Fragments DOI: 10.3390/app12030983 -
Carbonate confidence 1.0
“The band located at 864 is attributed to the 0 2 4 6 8 10 12 CAO bond of carbonates, and the broad bands centered at approx- [Si4+] [M+] or 1003cm(cid:1)1 976cm(cid:1)1 (Q2) (Q1) imately and are ascribed to asym-”
Comparative study of the various methods of preparation of silicate solution and its effect on the geopolymerization reaction DOI: 10.1016/j.rinp.2016.05.006
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