| | 1 | Author
| K. B. Ulmschneider, H. B. Stegmann, K. Scheffler, G. Viertel | Requires cookie* | | | Title
| Ionenpaare von o-Semichinonen mit Diorganothallium(QI)-Kationen* Ion Pairs of Semiquinones with Diorgano Thallium (III) Cations  | | | | Abstract
| Diorgano thallium hydroxide reacts very smoothly in organic solvents with catechols to stable paramagnetic ion pairs. This reaction has been investigated with two semiquinone anions and 13 different diorgano thallium cations. The data obtained indicate a strong dependence of the thallium coupling constant on the nature of the metal substituents. The effects observed are discussed in terms of electronic and steric interactions. All ion pairs indicate remarkable temperature dependence of the thallium splitting and the g-factor. These results are compared with the results obtained in alkali metal ion pairs using a model described in the literature. Einführung | | | |
Reference
| Z. Naturforsch. 33b, 237—240 (1978); eingegangen am 4. November 1977 | | | |
Published
| 1978 | | | |
Keywords
| Ion Pairs, ESR, Radicals, Thallium Organic Compounds | | | |
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| default:Reihe_B/33/ZNB-1978-33b-0237.pdf | | | | Identifier
| ZNB-1978-33b-0237 | | | | Volume
| 33 | |
| 2 | Author
| Norio Miyoshi, Giiti Tomita | Requires 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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| default:Reihe_B/34/ZNB-1979-34b-1552.pdf | | | | Identifier
| ZNB-1979-34b-1552 | | | | Volume
| 34 | |
| 3 | Author
| Norio Miyoshi, Giiti Tomita | Requires 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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| default:Reihe_B/35/ZNB-1980-35b-0107.pdf | | | | Identifier
| ZNB-1980-35b-0107 | | | | Volume
| 35 | |
| 5 | Author
| | Requires cookie* | | | Title
| The UV Photolysis (x = 185 n m ) o f Liquid Methyl rc-Propyl Ether | | | | Abstract
| H e i n z -P e t e r S c h u c h m a n n a n d Cl e m e n s v o n S o n n t a g Methyl The main products of the 185 nm photolysis of liquid methyl n-propyl ether (quantum yields in parentheses) are n-propanol (0.70), m ethane (0.29), «ec-butyl methyl ether (0.20), methanol (0.16), propionaldehyde (0.13), 3,4-dimethoxyhexane (0.09), ethane (0.08), and ethyl n-propyl ether (0.08). The quantum yields of further 24 minor products have been measured. The quantum yield of the sum of primary photochemical processes, the main ones of which are the homolytic scissions of the C -0 bonds (reactions i and ii), is close to unity. | | | |
Reference
| (Z. Naturforsch. 30b, 399—403 [1975]; received January 27 1975) | | | |
Published
| 1975 | | | |
Keywords
| n-Propyl Ether, UV Photolysis, Quantum Yields, Radicals, Molecular Elimination Processes | | | |
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| default:Reihe_B/30/ZNB-1975-30b-0399.pdf | | | | Identifier
| ZNB-1975-30b-0399 | | | | Volume
| 30 | |
| 6 | Author
| R. Upert Bauer, Christian Königstein | Requires cookie* | | | Title
| Sterische Effekte auf die Hydrierstabilität von l,r-Dialkyl-4,4-bipyridiniumsalzen (Viologenen) in wasserphotolytischen Systemen Steric Effects on the Hydrogen Stability of l,r-D ialkyl-4,4'-bipyridinium Salts (Viologens) in W ater Photolytic Systems | | | | Abstract
| The chemical stability o f l,l'-dialkyl-4,4'-bipyridinium com pounds (viologens) as electron relay agents in hydrogen producing water photolytic systems is o f great importance for practi cal applications. Three new l,r-dialkyl-4,4'-bipyridinium com pounds (1 = l,l'-dim | | | |
Reference
| Z. Naturforsch. 46b, 1544—1548 (1991); eingegangen am 7. M ärz/27. M ai 1991 | | | |
Published
| 1991 | | | |
Keywords
| Electron Relay Com pounds, Viologen Derivatives, Water Photolytic Systems, Hydrogen, Radicals | | | |
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| default:Reihe_B/46/ZNB-1991-46b-1544.pdf | | | | Identifier
| ZNB-1991-46b-1544 | | | | Volume
| 46 | |
| 7 | Author
| Manfred Weidenbruch, Klaus Kramer, Karl Peters, Hans Georg Von Schnering | Requires cookie* | | | Title
| Siliciumverbindungen mit starken intramolekularen sterischen Wechselwirkungen, XX [1] l,l-Di-terf-butyl-2,2-dimesityldisilane: Synthese | | | |
Reference
| Z. Naturforsch. 40b, 601—606 (1985) | | | |
Published
| 1985 | | | |
Keywords
| Molekülstruktur, Radikale Silicon Compounds with Strong Intramolecular Steric Interactions, XX [1] l, l-Di-rm-butyl-2, 2-dimesityldisilanes: Synthesis, Molecular Structure, Radicals, l-Di-rm-butyl-2, 2-dimesityldisilanes, X-Ray, Emperical Force Field Calculations, Disilenyl Radical Anion | | | |
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| default:Reihe_B/40/ZNB-1985-40b-0601.pdf | | | | Identifier
| ZNB-1985-40b-0601 | | | | Volume
| 40 | |
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