Search results for "Autoxidation"

showing 3 items of 33 documents

Thermische Autoxydation und thermische Polymerisation des Styrols. Der Mechanismus der Startreaktion

1964

Die thermische Autoxydation des Styrols wurde bei verschiedenen Sauerstoffpartial drucken und in verschieden konzentrierten Losungen in Chlorbenzol mit Hilfe einer WARBURG-Apparatur gemessen. Aus den kinetischen Beziehungen folgt, das sich zuerst aus swei Styrolmolekulen ein Zwischenprodukt bildet, das von molekularem Sauerstoff unter Radikalbildung dehydriert wird. The thermal autoxidation of styrene was carried out in a WARBURG apparatus in different concentrations in chlorobenzene and under different partial pressures of oxygen. In consequence of the kinetic relations an intermediate is formed by two styrene molecules and this intermediate is dehydrated by molecular oxygen under the form…

chemistry.chemical_compoundchemistryAutoxidationChlorobenzeneRadicalPolymer chemistryMoleculechemistry.chemical_elementMolecular oxygenPartial pressureOxygenStyreneDie Makromolekulare Chemie
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A synergic nanoantioxidant based on covalently modified halloysite–trolox nanotubes with intra-lumen loaded quercetin

2016

We describe the preparation and properties of the first example of a synergic nanoantioxidant, obtained by different functionalizations of the external surface and the inner lumen of halloysite nanotubes (HNTs). Trolox, a mimic of natural α-tocopherol, was selectively grafted on the HNT external surface; while quercetin, a natural polyphenolic antioxidant, was loaded into the inner lumen to afford a bi-functional nanoantioxidant, HNT–Trolox/Que, which was investigated for its reactivity with transient peroxyl radicals and a persistent 1,1-diphenyl-2-picrylhydrazyl (DPPH˙) radical in comparison with the corresponding mono-functional analogues HNT–Trolox and HNT/Que. Both HNT–Trolox and HNT/Q…

halloysite nanotubes antioxidants peroxyl radicals quercetin Trolox synergismAntioxidantRadicalmedicine.medical_treatmentBiomedical Engineering02 engineering and technology010402 general chemistry01 natural scienceschemistry.chemical_compoundReaction rate constantmedicinehalloysite trolox release quercetin antioxidantOrganic chemistryGeneral Materials ScienceAcetonitrileSettore CHIM/02 - Chimica FisicaAutoxidationChemistryGeneral ChemistryGeneral MedicineSettore CHIM/06 - Chimica Organica021001 nanoscience & nanotechnology0104 chemical sciencesChlorobenzeneTrolox0210 nano-technologyQuercetinNuclear chemistry
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Examples of UV–Vis profiles use as tool for evidence of the metallophthalocyanines transformation

2017

Abstract The UV–Vis spectra for a set of MPcs (Mmetal, Pc = phthalocyanine ligand), i.e.: In(III)PcI (1), Hf(IV)PcI2Pht (Pht = phthalonitrile) (2), Sn(II)Pc (3), Sn(IV)PcI2 (4), and Ge(IV)PcI2 (5) have been examined in two solvents, O-donative acetylacetone, and non-coordinative benzene. The UV–Vis spectra in Hacac solution of 1,2 and 4,5 shows that the axially ligated iodine atoms are replaced by (acac)− anions of the solvent, whereas in 3 the oxygen donors of the solvent causing the auto-oxidation of Sn(II) to Sn(IV) ions and as a result the Sn(II)Pc is transformed into the Sn(IV)Pc(acac)2. The chloride complexes of the 1–5 compounds are formed at Hacac solution after acidification by hyd…

hydrochloric acidAcetylacetoneInorganic chemistryHydrochloric acid010402 general chemistrydemetalation01 natural sciencesChlorideAnalytical ChemistryInorganic Chemistrychemistry.chemical_compoundUltraviolet visible spectroscopymedicineBenzeneSpectroscopyautooxidationAutoxidation010405 organic chemistryLigandtransformationOrganic Chemistry0104 chemical sciencesSolventchemistryPhysical chemistrymetallophthalocyaninesspectrum UV–Vismedicine.drugJournal of Molecular Structure
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