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'Diphenylisobenzofuran' in keywords
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1980 (2)
1979 (2)
1978 (1)
1Author    Norio Miyoshi, Giiti TomitaRequires cookie*
 Title    Production and Reaction of Singlet Oxygen in Aqueous Micellar Solutions Using Pyrene as Photosensitizer  
 Abstract    The reaction of singlet oxygen with 1,3-diphenylisobenzofuran was investigated in aqueous micellar solutions of sodium dodecyl sulfate and dodecyl trimethylammonium chloride using pyrene as photosensitizer. Singlet oxygen, produced by the photosensitiza-tion of pyrene bound to micelles, oxidized efficiently 1,3-diphenylisobenzofuran bound to micelles. The quantum yield for singlet oxygen production and the rate constant for furan oxidation were determined by the kinetic analysis for the oxidation reaction of furan. Quenching of singlet oxygen by sodium azide competed with the furan oxidation, and its rate constant was also determined. Results obtained were compared with those in methanolic solutions. The quantum yield for singlet oxygen production and the rate constant for furan oxidation were much higher in micellar solutions than those in methanolic solutions. Empty micelles w x as found to act as a considerably strong scavenger for singlet oxygen. The penetration probability of singlet oxygen from aqueous phase into the interior of micelles which bound furan was also estimated. 
  Reference    Z. Naturforsch. 33b, 622—627 (1978); received February 24 1978 
  Published    1978 
  Keywords    Singlet Oxygen, Pyrene, Diphenylisobenzofuran, Micelles 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0622.pdf 
 Identifier    ZNB-1978-33b-0622 
 Volume    33 
2Author    Norio Miyoshi, Giiti TomitaRequires cookie*
 Title    Quenching of Singlet Oxygen by Sodium Azide in Reversed Micellar Systems  
 Abstract    The oxidation reaction of singlet oxygen with 1,3-diphenylisobenzofuran was in-vestigated in cyclohexanic reversed micellar solutions of dodecylammonium propionate, using pyrene as photosensitizer. The furan oxidation was effectively inhibited by azide ion-bound reversed micelles. Empty reversed micelles also inhibited the furan oxidation to some extent. The inhibition of the furan oxidation was due to the quenching of singlet oxygen by azide ion-bound and empty reversed micelles. Such singlet oxygen quenching was dependent on the concentration of water added. Results obtained were discussed in connection with the polarity in the interior of reversed micelles, micellar size, the state of water solubilized in reversed micelles and the lifetime of singlet oxygen. The heavy atom effect on the quenching of singlet oxygen was also studied using heavy water. 
  Reference    Z. Naturforsch. 34b, 339—343 (1979); received October 4 1978 
  Published    1979 
  Keywords    Singlet Oxygen, Sodium Azide, Diphenylisobenzofuran, Reversed Micelles 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0339.pdf 
 Identifier    ZNB-1979-34b-0339 
 Volume    34 
3Author    Norio Miyoshi, Giiti TomitaRequires cookie*
 Title    Fluorescein-Photosensitized Furan Oxidation in Methanolic and Reversed Micellar Solutions, Part I Effects of Amines  
 Abstract    The 1,3-diphenylisobenzofuran oxidation reaction was investigated in methanolic and dodecylammonium propionate reversed micellar solutions using fluorescein sodium as photosensitizer. It was found that aniline remarkably enhanced the furan oxidation in methanolic solutions but inhibited it in reversed micellar solutions. This enhancement effect occurred more effectively at lower oxygen concentrations. It was proposed that, in the former solutions, the radical mechanism (Type I) might be involved in the furan oxidation in the presence of aniline besides singiet oxygen mechanism (Type II). The reversed micelle seems to inhibit the Type I reaction, resulting in no enhancement of the furan oxidation by aniline. 
  Reference    Z. Naturforsch. 34b, 1552—1555 (1979); received June 19 1979 
  Published    1979 
  Keywords    Singlet Oxygen, Radicals, Fluorescein, Diphenylisobenzofuran, Reversed Micelles 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-1552.pdf 
 Identifier    ZNB-1979-34b-1552 
 Volume    34 
4Author    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 
5Author    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