What absorbs at 1988 cm⁻¹ in an FTIR spectrum?
A band near 1988 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
Mabilis na sagot
A band near 1988 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.
Mga posibleng pagtatalaga ng functional-group
| Grupong functional | Mga sumusuportang katotohanan | Mga nasiping sanggunian | Pinakamataas na kumpiyansa |
|---|---|---|---|
| Hydroxyl (O-H) | 2 | 2 | 1.0 |
| Amide | 2 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| N n bond | 1 | 1 | 1.0 |
Ang pagraranggo ay sumasalamin sa naipon na ebidensya ng literatura, hindi isang solong awtoritatibong tuntunin. Palaging kumpirmahin laban sa konteksto ng iyong sample.
Mga posibleng materyales
| Materyal | Sumusuportang mga peak | Mga overlapping na grupo | Mga nasiping sanggunian |
|---|---|---|---|
| methane | 1988, 1740, 1400 | Hydroxyl (O-H), Ester | 1 |
| kaolinite | 1988, 3696, 693 | Hydroxyl (O-H) | 1 |
| quartz | 1988, 800, 3053 | Hydroxyl (O-H) | 1 |
| apatite | 1988, 3053, 1640 | Amide, Hydroxyl (O-H) | 1 |
Ang mga materyales ay ipinapakita lamang kapag ang parehong literatura pool ay sumusuporta sa banda na ito at hindi bababa sa isang karagdagang katangian na tuktok.
Logic ng spectrum
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 1988 cm⁻¹ is usually not enough for material identification by itself.
Paggamit sa totoong mundo
Ang uri ng query na ito ay karaniwan sa pagtukoy ng polymer, screening ng hindi kilalang plastic, pag-troubleshoot ng QC, pag-verify ng recycled na materyal, at pagsusuri ng pagtatalaga ng peak na may suporta ng literatura.
Mga karaniwang pagkakamali
- Pagtrato sa isang nakahiwalay na banda bilang patunay ng isang materyal nang hindi sinusuri ang hindi bababa sa isa o dalawang sumusuportang peak.
- Hindi pinapansin ang overlap: maraming functional group ang maaaring mag-ambag malapit sa parehong wavenumber.
- Pag-laktaw sa pagpapatunay kapag ang mga additives, blends, oxidation, o contamination ay maaaring mag-distort ng spectrum.
Payo sa pagpapatunay
Kapag nananatili ang kalabuan, patunayan ang hypothesis gamit ang DSC, GC-MS, o TGA, lalo na para sa mga blend, degraded na sample, at filled polymers.
Literatura sa likod ng mga pagtatalagang ito
-
Hydroxyl (O-H) kumpiyansa 1.0
“In the spectra of rough and curved samples, there are peaks at 1988 and 2123 cm-1, both attributed to diaspore hydroxyl frequency-doubled vibrations [16], indicating that these Myanmar Mogok sapphires originated in metamorphic or intrusive”
Study on Gemological Characteristics of Blue Sapphires from Baw-Mar Mine, Mogok, Myanmar DOI: 10.3390/cryst11111275 -
N n bond kumpiyansa 1.0
“n n pressure shift coefficients in the and bands of Appl Opt 1988;27:631-51.”
Smith 等 - 2009 - Multispectrum analysis of (CH4)-C-12 in the nu(4) DOI: 10.1016/j.jqsrt.2009.02.015 -
Amide kumpiyansa 1.0
“and amide II are the two most prominent proteins usedasbiologicalrecognitionelement;platformswere mg/mL) et al., bands (Surewicz 1988), in figure 3 purified immersed in a solution of antibody (0.01 in IgG antibody FTIR spectrum is observed,”
Gomez-Montano 等 - 2020 - Detection of Salmonella enterica on silicon substr DOI: 10.24275/rmiq/Bio993 -
Hydroxyl (O-H) kumpiyansa 1.0
“Payne & were appeared at 3385 indicating OH stretching vibrations, on Veis, 1988).”
Jafari 等 - 2023 - Preparation and characterization of active Cirish DOI: 10.1002/fsn3.3106 -
Ester kumpiyansa 1.0
“Deo & 2 2956 - 2850 CH 3: Lipids, proteins, carbohydrates, Natarajan, 1988 nucleic acids 1745 >C=O, ester stretching vibration Deo & Natarajan, 1988”
Merma 等 - 2017 - DOI: 10.1590/0370-446720167000063
May spectrum ka ba na may ganitong band?
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