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'Reversed Micelles' in keywords Facet   Publication Year 1980  [X]
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1980[X]
1Author    Norio Miyoshi, Giiti TomitaRequires cookie*
 Title    Fluorescein-photosensitized Furan Oxidation in Methanolic and Reversed Micellar Solutions, Part II Kinetic Analysis  
 Abstract    The 1,3-diphenylisobenzofuran oxidation was investigated in methanolic and dodecyl-ammonium propionate reversed micellar solutions using fluorescein sodium as photo-sensitizer. The furan oxidation was caused by the singlet oxygen mechanism (Type II). Aniline enhanced remarkably the furan oxidation in methanolic solutions, but inhibited highly this oxidation in the reversed micellar solutions. This enhancement of the furan oxidation was considered to be brought about by the occurrence of a radical mechanism (Type I) besides Type II mechanism. No Type I reaction occurred in the micellar solutions. The rate constants concerning with both reaction processes were evaluated by kinetic analysis, employing various aryl-and alkyl-amines. The reaction mechanism of Type I and the quenching mechanism of singlet oxygen by amines were discussed from the relationship between the rate constants, and the ionization potential of amines and the solvent polarity. 
  Reference    (Z. Naturforsch. 35b, 107—111 [1980]; received July 27 1979) 
  Published    1980 
  Keywords    Singlet Oxygen, Radicals, Fluorescein, Diphenylisobenzofuran, Reversed Micelles 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0107.pdf 
 Identifier    ZNB-1980-35b-0107 
 Volume    35 
2Author    Norio Miyoshi, Giiti TomitaRequires cookie*
 Title    Singlet Oxygen Production Photosensitized by Fluorescein in Reversed Micellar Solutions  
 Abstract    The quantum yield of singlet oxygen production was investigated in dodecylammonium propionate reversed micellar solutions containing 1,3-diphenylisobenzofuran and fluo-rescein as photosensitizer. The quantum yield was highly enhanced by the binding of fluorescein to reversed micelles, and increased with decreasing the solubilized water content in reversed micelles. Results obtained was discussed with the optical properties of fluorescein (absorption, fluorescence and phosphorescence) in reversed micellar solutions. 
  Reference    Z. Naturforsch. 35b, 731—735 (1980); received December 7 1979 
  Published    1980 
  Keywords    Singlet Oxygen, Fluorescein, Diphenylisobenzofuran, Water Content, Reversed Micelles 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0731.pdf 
 Identifier    ZNB-1980-35b-0731 
 Volume    35 
3Author    Norio Miyoshi, Giiti TomitaRequires cookie*
 Title    Buffer Action of Reversed Micelles  
 Abstract    The optical properties (absorption and fluorescence) of fluorescein sodium were investi-gated with changing the bulk pH value in aqueous, water-methanol mixed and dodecyl-ammonium propionate reversed micellar solutions. A strong buffer action was found in the reversed micellar solutions. The pKa values for the equilibrium between fluorescein mono-and di-anions in the ground and excited singlet states highly decreased in the reversed micellar solutions compared with those in non-micellar solutions. The micellar buffer action strongly affected the initial rate of the 1,3-diphenylisobenzofuran oxidation caused by the photosensitization of fluorescein. The buffer action was closely related to the solubilized water content. 
  Reference    Z. Naturforsch. 35b, 736—740 (1980); received January 9 1980 
  Published    1980 
  Keywords    Fluorescein, Reversed Micelles, Buffer Action, Solubilized Water 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0736.pdf 
 Identifier    ZNB-1980-35b-0736 
 Volume    35 
4Author    Norio Miyoshi, Giiti TomitaRequires cookie*
 Title    Solubilization of Methylene Blue in Reversed Micelles, Effect of Water  
 Abstract    The solubilization of methylene blue in dodecylammonium propionate reversed micelles in cyclohexane depended strongly on the solubilized water content. Methylene blue solubilized in the micelle of which head groups are not completely hydrated by bound water exhibited the new absorption bands at 495 and 270 nm, but these bands did not appear in the micelle containing free water. This dye had the absorption bands at 655 and 290 nm in the latter micelle. The solubilizing process and solubilized state of methylene blue in the reversed micelles were discussed with results obtained. 
  Reference    Z. Naturforsch. 35b, 741—745 (1980); received February 20 1980 
  Published    1980 
  Keywords    Methylene Blue, Reversed Micelles, Water Content, Solubilization 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0741.pdf 
 Identifier    ZNB-1980-35b-0741 
 Volume    35