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1Author    F. Temps, H. Gg, M. Wagner, WolfRequires cookie*
 Title    Far-Infrared Laser Magnetic Resonance Detection of CH 2 C1  
 Abstract    New Far Infrared Laser Magnetic Resonance (LMR) spectra have been detected in the reaction of Cl atoms with CH 2 CO. Based on chemical and kinetic evidence they were assigned to CH 2 C1 radicals. The assignment was substantiated by subsequent experiments which employed the reac-tions of F atoms with CH 3 C1 and Na atoms with CH 2 C1 2 , respectively. The three different sources yielded identical spectra. 
  Reference    Z. Naturforsch. 47a, 660—664 (1992); received February 6 1992 
  Published    1992 
  Keywords    Laser Magnetic resonance, Radicals, Rotational spectroscopy 
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 TEI-XML for    default:Reihe_A/47/ZNA-1992-47a-0660.pdf 
 Identifier    ZNA-1992-47a-0660 
 Volume    47 
2Author    J. Nolte, J. Grußdorf, F. Temps, H. Gg, WagnerRequires cookie*
 Title    Kinetics of the Reaction HOCO + 0 2 in the Gas Phase  
 Abstract    Using the discharge flow method, the kinetics of the gas phase reaction HOCO + 0 2 products (1) was investigated at room temperature and pressures around p « 2.0 mbar with Far Infrared Laser Magnetic Resonance (FIR-LMR) detection of HOCO, H0 2 , and OH. From the measured concen-tration-versus-time decay profiles of HOCO in the absence and presence of a large excess of 0 2 , the overall rate constant of the reaction was found to be k, (296 K) = (9.9 ±1.5) • 10 11 cm 3 /mol • s. The main reaction channel, which leads to production of H0 2 + C0 2 , could be established. 
  Reference    Z. Naturforsch. 48a, 1234—1238 (1993); received November 3 1993 
  Published    1993 
  Keywords    Chemical kinetics, Gases, Radicals, Spectroscopy, Laser Magnetic Resonance 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-1234.pdf 
 Identifier    ZNA-1993-48a-1234 
 Volume    48 
3Author    K. B. Ulmschneider, H. B. Stegmann, K. Scheffler, G. ViertelRequires 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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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0237.pdf 
 Identifier    ZNB-1978-33b-0237 
 Volume    33 
4Author    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 
5Author    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 
6Author    Wolfgang Kaim, Peter Hänel, Hans BockRequires cookie*
 Title    Die Reduktion von Triphenylphosphan-Derivaten zu ihren Radikalanionen und zum Dibenzophosphol-Radikaldianion [1] The Reduction of Triphenylphosphane Derivatives to their Radical Anions and to the Radical Dianion of Dibenzophosphole [1]  
  Reference    Z. Naturforsch. 37b, 1382—1387 (1982); eingegangen am 20. August 1982 
  Published    1982 
  Keywords    Triphenylphosphane, Dibenzophosphole, Reduction, Radicals, ESR Spectra 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-1382.pdf 
 Identifier    ZNB-1982-37b-1382 
 Volume    37 
7Author    Wolfgang Flossmann, Herbert Zehner, Adolf MüllerRequires cookie*
 Title    Radicals Produced in Single Crystals of Thymine Derivatives by UV and X-Rays  
 Abstract    Single crystals o f anhydrous thym ine (T), thym ine monohydrate (T ■ H 20) , 5,6-dihydrothym ine (T H 2), 1-methylthymine (mT) and thym idine (dT) were irradiated with X-rays and UV between 77 K and 300 K. Six types o f radicals were analyzed by ESR-spectroscopy at 9.5 G H z and 35 G H z after exposure to X-rays. The anion radical occurred only in T • H 20 at 77 K, the 4-yl radical only in T H 2 at 77 K and the 1-yl radical only in T between 77 K and 300 K. The 6 -yl radical was found in T, T H 2 and mT. It was converted into the 5-yl radical irreversibly by heat or white light (A < 600 nm). The 5-yl radical appeared in all compounds at room temperature. The highest thermal stability was found for the 7-yl radical which was present at room temperature in all compounds except T H 2 . U V -irradiation (A = 320 nm) produced radicals only in three crystals (T, T H 2 , dT). In T the 5-yl radical was found after exposure at 300 K, and two other radicals, 1-yl and 7-yl, at 77 K. A lso at 77 K, the 7-yl radical was present in dT and the 5-yl radical in TH 2 and dT. 
  Reference    Z. Naturforsch. 35c, 20—2 (1980); received July 23 1979 
  Published    1980 
  Keywords    Radicals, Single Crystals, Thym ine, X-Rays, ESR 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0020.pdf 
 Identifier    ZNC-1980-35c-0020 
 Volume    35 
8Author    B. Kramer, J. Fleischhauer, J. MichlRequires cookie*
 Title    Magnetischer Circular Dichroismus (MCD) von cyclischen rc-Elektronensystemen mit 4N±1 Elektronen  
 Abstract    The theory of the magnetic circular dichroism (MCD) of cyclic re-electron systems with 4 N ± 1 electrons, such as the radical anion of [16] annulene, has been investigated in the perimeter model approximation. General solutions and formulas for the calculation of the Faraday parameters A, B, and C are derived analytically. The calculated and measured spectra of the 17 re-electron [16] annulene radical are in good agreement. 
  Reference    Z. Naturforsch. 48a, 1243—1255 (1993) 
  Published    1993 
  Keywords    Magnetic circular dichroism, Perimeter model, PPP method, re-Electron systems, Radicals 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-1243.pdf 
 Identifier    ZNA-1993-48a-1243 
 Volume    48 
9Author    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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 TEI-XML for    default:Reihe_B/30/ZNB-1975-30b-0399.pdf 
 Identifier    ZNB-1975-30b-0399 
 Volume    30 
10Author    R. Upert Bauer, Christian KönigsteinRequires 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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 TEI-XML for    default:Reihe_B/46/ZNB-1991-46b-1544.pdf 
 Identifier    ZNB-1991-46b-1544 
 Volume    46 
11Author    Manfred Weidenbruch, Klaus Kramer, Karl Peters, Hans Georg Von SchneringRequires 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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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0601.pdf 
 Identifier    ZNB-1985-40b-0601 
 Volume    40