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  • Open access
  • 26 Reads
Microwave Assisted Oxidation of Some Aromatics by Hydrogen Peroxide at Supported Tungsten Catalyst
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The oxidation of some aromatics with the alkyl side grups by hydrogen peroxide has been presented. As the activator of hydrogen peroxide the tungstoboric acid was chosen. The catalyst was examined in both homogeneous and heterogeneous conditions. The reaction in conventional condidtions were compared with the microwave assited reactions.
  • Open access
  • 65 Reads
Microwave-Assisted Oxidation of Starch Using Hydrogen Peroxide
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The oxidations of native starch by hydrogen peroxide using microwaves as an energy source is described. The reaction results in oxidation of some primary hydroxyl group into corresponding aldehyde or carboxylic group. The observed differences in the degree of oxidation (monitored by analysis of corbonyl and carboxyl group content) as well as the changes in molecular mass of biopolymer comparing to those found at conventional conditions were showed.
  • Open access
  • 37 Reads
Note to Titanium (III) and (IV) Phthalocyanines Synthesis in Modified Microwave Oven
Microwave irradiation of 1,2-dicyanobenzene (phthalodinitrile) and reducing agent (hydrogen donor) or 1,3-diiminoisoindoline in organic solvents with titanium (III) or titanium (IV) chlorides after treating with water leads to titaniumoxo (IV) phthalocyanine. The formation of titaniumchloro (III) phthalocyanine in solvent-free conditions and in solvents under microwave irradiation is discussed.
  • Open access
  • 57 Reads
Microwave-Assisted Synthesis of Polyesters Containing 1,4:3,6-dianhydrohexitols
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Series of reactions were carried out for three dianhydrohexitols (isosorbide, isomannide and isoidide) and one aliphatic carboxylic acid – suberic acid - and its derivatives. The reactions were performed in the microwave reactor in an open vessel equipped with mechanical stirrer. Polymer products with highest yields were obtained in reaction of isosorbide and suberoyl chloride. For microwave reactions with the most satisfactory yields, conventional synthesis were also performed.
  • Open access
  • 36 Reads
Theoretical Study of Bis-Porphyrin-Fullerene Supramolecular Complex Designed for Photovoltaic Devices
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A computational study of a bis-porphyrin-fullerene supramolecular complex designed for photovoltaic devices using semiempirical AM1 method is presented. The study of the frontier molecular orbitals in the ground state has revealed that porphyrin part is an electron donor moiety, while fullerene guest is an electron acceptor. The electronic properties of the excited singlet states of 1@C60add complex indicate electron transfer from porphyrin to fullerene moiety.
  • Open access
  • 61 Reads
Dendritic Liquid-Crystalline Fullerene-Ferrocene Dyads
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First- and second-generation ferrocene-based dendrimers, fullerene and a second-generation liquid-crystalline poly(arylester) dendrimer carrying four cyanobiphenyl units were assembled to elaborate polyfunctional materials displaying mesomorphic and electronic properties. The targeted compounds gave rise to enantiotropic smectic A phases and organized into bilayer structures within the smectic layers. Cyclic voltammetry investigations revealed oxidation and reduction processes in agreement with the presence of both ferrocene and fullerene units. Finally, strong quenching of the fluorescence was obtained for the fullerene-ferrocene dyads suggesting efficient elecron transfer from the ferrocene-based dendrimer to fullerene.
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