What absorbs at 3485 cm⁻¹ in an FTIR spectrum?
A band near 3485 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 6 cited sources
Jibu la haraka
A band near 3485 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.
Ugawaji unaowezekana wa vikundi vya kazi
| Kikundi cha kazi | Ukweli unaounga mkono | Vyanzo vilivyotajwa | Uaminifu wa juu |
|---|---|---|---|
| Hydroxyl (O-H) | 3 | 3 | 1.0 |
| Alkene (C=C) | 2 | 2 | 1.0 |
| N h | 2 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| Ring structure | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| C-O single bond | 1 | 1 | 1.0 |
Cheo kinaonyesha ushahidi wa fasihi uliokusanywa, si sheria moja yenye mamlaka. Thibitisha kila mara dhidi ya mazingira ya sampuli yako.
Nyenzo zinazowezekana
| Nyenzo | Vilele vya usaidizi | Vikundi vinavyoingiliana | Vyanzo vilivyotajwa |
|---|---|---|---|
| PVA | 3485, 1660, 2930 | Hydroxyl (O-H) | 1 |
| chitosan | 3485, 1650, 1655 | Hydroxyl (O-H), N h | 1 |
| bio-based | 3485, 1720, 1740 | Hydroxyl (O-H), N h | 1 |
Nyenzo zinaonyeshwa tu wakati mkusanyiko sawa wa fasihi unaunga mkono bendi hii na angalau kilele kimoja cha ziada cha sifa.
Mantiki ya wigo
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 3485 cm⁻¹ is usually not enough for material identification by itself.
Matumizi ya ulimwengu halisi
Aina hii ya swala ni ya kawaida katika utambuzi wa polima, uchunguzi wa plastiki isiyojulikana, utatuzi wa shida za QC, uthibitishaji wa nyenzo zilizosindikwa, na ukaguzi wa ugawaji wa kilele unaoungwa mkono na fasihi.
Makosa ya kawaida
- Kuchukua bendi moja iliyotengwa kama uthibitisho wa nyenzo bila kuangalia angalau kilele kimoja au viwili vya usaidizi.
- Kupuuza mwingiliano: vikundi vingi vya utendaji vinaweza kuchangia karibu na nambari ya wimbi sawa.
- Kuruka uthibitishaji wakati viongezi, mchanganyiko, uoksidishaji, au uchafuzi unaweza kupotosha wigo.
Ushauri wa uthibitishaji.
Wakati utata unabaki, thibitisha nadharia kwa kutumia DSC, GC-MS, au TGA, hasa kwa mchanganyiko, sampuli zilizoharibika, na polima zilizojazwa.
Fasihi nyuma ya ugawaji huu
-
C-O single bond uaminifu 1.0
“x = For pure PVA, four characteristic absorption bands are observed: the one at 3485 cm-1 which is assigned to vibration along the C-OH-chains bonds in PVA;”
Fernández 等 - 2017 - DOI: 10.17230/ingciencia.13.25.6 -
uaminifu 1.0
“Furthermore, the cm-1 cm-1 in the typical area was attributed to the N-H stretching vibration at 3485 cm-1 [36].”
Purification and Characterization of a Novel Calcium-Binding Heptapeptide from the Hydrolysate of Tilapia Bone with Its Osteogenic Activity DOI: 10.3390/foods11030468 -
Alkene (C=C) uaminifu 1.0
“The characteristic cm-1 which can assign to the stretching vibrations of conjugate double bonds in aromatic ring absorption peak of hydroxyl appeared at 3485 and the peak of carbonyl splits into two peaks cm-1 cm-1 framework.”
Effect of Phenolic Resin Oligomer Motion Ability on Energy Dissipation of Poly (Butyl Methacrylate)/Phenolic Resins Composites DOI: 10.3390/polym12020490 -
Hydroxyl (O-H) uaminifu 1.0
“The sharp pair bands at 3485 cm-1 Thr11814, 36, (+)/3428 (-) in MRh originate from the O-H stretch of and similar bands at 3485 in MG and cm-1 (+)/3432 (-) 3486 in MR are expected because of the O-H stretches of the corresponding Ser residu”
Spectral Tuning Mechanism of Primate Blue-sensitive Visual Pigment Elucidated by FTIR Spectroscopy DOI: 10.1038/s41598-017-05177-4 -
Amide uaminifu 1.0
“In the spectrum of PMA (B) in Figure 2, sponded to C=O stretching (amide I), N-H bending (amide II), and C-N stretching (amcm-1 the characteristic absorption bands appeared at 3485, 2930, and 2890 due to -OH”
Sathya Seeli 等 - 2023 - Zinc Oxide-Incorporated Chitosan-Poly(methacrylic DOI: 10.3390/jfb14040228 -
Alkene (C=C) uaminifu 0.9
“Explicit assignment: 'C=C from DiEP1 and DiEP2 is observable at 3485'”
New Eco-Friendly Synthesized Thermosets from Isoeugenol-Based Epoxy Resins DOI: 10.3390/polym12010229
Una wigo wenye bendi hii?
Pakia wigo wako wa FTIR na upate ripoti kamili ya tafsiri — ugawaji wa vilele na marejeleo ya fasihi, ulinganishaji wa maktaba, na mlolongo wa ushahidi wenye kiwango cha uaminifu — kwa sekunde.