What absorbs at 1676 cm⁻¹ in an FTIR spectrum?
A band near 1676 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
Hurtigt svar
A band near 1676 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.
Mulige funktionelle gruppetildelinger
| Funktionel gruppe | Understøttende fakta | Citerede kilder | Højeste tillid |
|---|---|---|---|
| Amide | 5 | 5 | 1,0 |
| Carbonyl (C=O) | 3 | 3 | 1,0 |
| Carboxyl (COOH) | 2 | 2 | 1,0 |
| Methacrylate | 2 | 2 | 1,0 |
| Acetate | 2 | 2 | 1,0 |
| Protein | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| Protein beta sheet | 1 | 1 | 1,0 |
| Protein beta turn | 1 | 1 | 1,0 |
Rangering afspejler akkumulerede litteraturbeviser, ikke en enkelt autoritativ regel. Bekræft altid mod din prøvekontekst.
Spektrumlogik
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 1676 cm⁻¹ is usually not enough for material identification by itself.
Anvendelse i virkeligheden
Denne type forespørgsel er almindelig ved polymeridentifikation, screening af ukendt plast, fejlfinding i kvalitetskontrol, verifikation af genanvendt materiale og litteraturunderstøttet gennemgang af peak-tildeling.
Almindelige fejl
- Behandling af et isoleret bånd som bevis på et materiale uden at kontrollere mindst en eller to understøttende toppe.
- Ignorerer overlap: flere funktionelle grupper kan bidrage nær samme bølgetal.
- Spring validering over, når additiver, blandinger, oxidation eller forurening kan forvrænge spektret.
Verifikationsrådgivning
Når tvetydighed fortsat består, valider hypotesen med DSC, GC-MS eller TGA, især for blandinger, nedbrudte prøver og fyldte polymerer.
Litteratur bag disse tildelinger
-
Amide tillid 1,0
“The positive influence of PC2 loadings had three peaks at 1676, 1630 cm-1 assigned to amide I (β-turns and β-sheets), and 1063 cm-1 (mostly might be related to cellulose and hemicellulose) which differentiated the control SR (outstanding) f”
Specific Mycoparasite-Fusarium Graminearum Molecular Signatures in Germinating Seeds Disabled Fusarium Head Blight Pathogen’s Infection DOI: 10.3390/ijms22052461 -
Carbonyl (C=O) tillid 1,0
“Text: 'IR peaks at 1676 cm-1 down-shifted from 1703 cm-1 (C=O stretching)'”
Curve-fitting FTIR studies of loratadine/hydroxypropyl-β-cyclodextrin inclusion complex induced by co-grinding process DOI: 10.1016/j.jpba.2010.06.010 -
Carbonyl (C=O) tillid 1,0
“J.Morosetal./JournalofPharmaceuticalandBiomedicalAnalysis43(2007)1277-1282 1280 1676cm-1 and it can be related to the presence of a carbonyl group (C O).”
Moros 等 - 2007 - Quality control Fourier transform infrared determi DOI: 10.1016/j.jpba.2006.10.036 -
Amide tillid 1,0
“The shifts of 1676 cm-1 Liquid → Liquid 1 + Liquid 2 transition occurs also through a and 1655 correspond to amide I weakly and more strongnucleation and growth process but in most cases through hetly H-bonded respectively.”
Origin of Invariant Gel Melting Temperatures in the c-T Phase Diagram of an Organogel DOI: 10.1021/acs.langmuir.6b00995 -
Amide tillid 1,0
“peaks of amide-I at 1676 (-)/1666 (+)/1658 (-)/1651 (+) At 163 K, observed water signals are similar to those at cm-1 upon formation of Batho at 77 K, among which the 77 K, with some variations (Fig.”
Hanai 等 - 2021 - Light-induced difference FTIR spectroscopy of prim DOI: 10.2142/biophysico.bppb-v18.005 -
Amide tillid 1,0
“LLM confirmed rule peak-group candidate”
Purification and Characterization of a Novel Calcium-Binding Heptapeptide from the Hydrolysate of Tilapia Bone with Its Osteogenic Activity DOI: 10.3390/foods11030468 -
Amide tillid 1,0
“Signals near 2900 (C-H stretching band) were scarcely informative, whereas the clear cm-1 (C=O shoulder-peak at 1676 stretching band) could be from amide I in proteins.”
“Argento Deaurato” or “Argento Biancheggiato”? A Rare and Interesting Case of Silver Background in Italian Painting of the XIII Century DOI: 10.3390/app10072404 -
Alkene (C=C) tillid 1,0
“cm-1 The intense band observed at 1676 is due to vibrations of C=C (cis and trans), confi rming the presor parts of molecules inside their cavity through non-”
Pinto Cotrim 等 - 2016 - Preparation of beta-CyclodextrinLatex Dispersion DOI: 10.7569/JRM.2015.634122
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