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1979 (2)
1978 (3)
1977 (2)
1976 (3)
1Author    Egon Fahr, Georg Ph, Roth, Peter WüstenfeldRequires cookie*
 Title    Die gas-chromatographische Untersuchung der bei der UV-Bestrahlung von Uracil und Thymin in Lösung und in der Eismatrix gebildeten Produkte* Gas-chromatographic Investigation of Products Formed by UV Irradiation of Uracil and Thymine in Solution and Ice Matrix  
 Abstract    By g£is-chromatographic analysis of products prepared by UV irradiation of uracil in water, acetonitrile or ice matrix resp. of thymine in actonitrile could be demonstrated, that in all cases all four cyclobutane dimers are formed. 
  Reference    Z. Naturforsch. 33b, 646—651 (1978); eingegangen am 6. Dezember 1977 
  Published    1978 
  Keywords    UV, Uracil, Thymine 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0646.pdf 
 Identifier    ZNB-1978-33b-0646 
 Volume    33 
2Author    Von Galvinoxyl-Mehrspinsystemen, W. Gierke, W. Harrer, B. Kirste, H. Kurreck, J. Reusch, Herrn Prof, G. Dr, ManeckeRequires cookie*
 Title    Über Galvinole und Galvinoxyle, II EPR-HFS-und elektronen-spektroskopische Untersuchung On Galvinols and Galvinoxyls, II EPR and Electronic Absorption Spectra of Oligo Galvinoxyl Radicals in Solution  
 Abstract    The synthesis of several so far unknown mono-and oligo-galvinols and galvinoxyls is described. The ESR hyperfine splitting measurements in liquid solution indicate that the spin exchange frequency is greater than the hyperfine splitting in the galvinoxyl biradicals (J^>a). The electronic absorption spectra of the galvinols and galvinoxyls are discussed taking into account the different prototropic and redox equilibria, respectively. Using magnetic susceptibility measurements the singlet-triplet and doublet-quartet splitting is studied. 
  Reference    (Z. Naturforsch. 31b, 965—973 [1976]; eingegangen am 5. März 1976) 
  Published    1976 
  Keywords    EPR, UV, Galvinols, Galvinoxyls 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-0965.pdf 
 Identifier    ZNB-1976-31b-0965 
 Volume    31 
3Author    Jürgen KeimRequires cookie*
 Title    Ein Beitrag zur Photochemie aromatischer Nitroverbindungen, III* A Contribution to the Photochemistry of Aromatic Nitro Compounds  
 Abstract    During UV irradiation of nitrobenzene and some derivatives in benzene solution biphenyls are formed as in the case of the corresponding iodobenzenes. Using fluorobenzene as a solvent, isomeric fluorobiphenyls (o, TO, p) will be found as reaction products having a definite distribution (o >m > p), which is characteristic for substitution by radicals. Therefore, we conclude that the CN-bond is split homolytically. Besides the biphenyls, other important reaction products of the aromatic nitro compounds -phenols and nitro-phenols -are identified. 
  Reference    Z. Naturforsch. 34b, 995—998 (1979); eingegangen am 28. Februar 1979 
  Published    1979 
  Keywords    Photochemistry, Aromatic Nitro Compounds, UV 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0995.pdf 
 Identifier    ZNB-1979-34b-0995 
 Volume    34 
4Author    A. Scheffler, UndW. PreetzRequires cookie*
 Title    Halogenokomplexe von Osmium(III) mit Pyridin, Pyrazin, Pyrimidin und einigen Methylhomologen Halogeno-Complexes of Osmium(III) with Pyridine, Pyrazine, Pyrimidine and Some Methyl-Homologes Mer-trihalogeno-tris(N-donor)osmium(III) Complexes  
 Abstract    The preparation of mer-[OsX3B3], X = C1, Br, I; B = pyridine, 3-resp. 4-picoline, pyrimidine, pyrazine, methylpyrazine, and the chromatographic isolation of four base-mixed stereoisomers mer-[OsX3(py)n(mepyz)3_ n ], n— 1, 2, as solid crystalline products is described. Mass spectra and ligand exchange reactions confirm the structure of these complexes. The UV and IR spectra are discussed. 
  Reference    (Z. Naturforsch. 31b, 1099—1105 [1976]; eingegangen am 29. März/30. April 1976) 
  Published    1976 
  Keywords    Chromatographie Separation, UV, IR, Mutual Ligand Influences 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-1099.pdf 
 Identifier    ZNB-1976-31b-1099 
 Volume    31 
5Author    Tetraphenylphosphonium-Isopolymolybdates, Roger Grase, Joachim FuchsRequires cookie*
 Title    Über Tetraphenylphosphonium-Isopolymolybdate  
 Abstract    From acidified sodium molybdate solutions mixtures of two polymolybdates are precipitated by addition of tetraphenylphosphonium ions. The pure compounds obtainable by separation with selective organic solvents were identified analytically and by their vibrational spectra as octamolybdate, [P(C6Hs)4]4Mo8026, with "Lindqvist structure" and as hexamolybdate, [P(C6Hs)4Mo60i9. They are characterized by their UV-VIS spectra and X-ray powder patterns. The precipitation of the hexamolybdate from strong acidic solution can be used analytically for the determination of molybdenum. 
  Reference    Z. Naturforsch. 33b, 533—536 (1978); eingegangen am 20. Januar 1978 
  Published    1978 
  Keywords    Isopolymolybdates, Preparation, Vibrational Spectra, X-ray, UV 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0533.pdf 
 Identifier    ZNB-1978-33b-0533 
 Volume    33 
6Author    Richard Ratka, ManfredL. Ziegler, Gerhard SchillingRequires cookie*
 Title    Darstellung und Charakterisierung von chiralen und achiralen exocyclischen 7r-enyl-Komplexen der Zusammensetzung (C8H13PdCl)2 Synthesis and Characterization of Exocyclic jr-Enyl Complexes of the Composition (C8Hi3PdCl)2  
 Abstract    The mechanism of formation of the exocyclic dimeric jr-enyl complex (C8Hi3PdCl)2 by reaction of 1,3-dimethylenecyclohexane, C8HI2 with irans-PdCl2(C6H5CN)2 is discussed. Through UV, X H NMR (90 MHz, 360 MHz) and 13 C spectroscopic studies it was possible to show that the dimer is formed by the disproportionate of C8Hi2 to C8Hi4 and m-xylene, and further that it consists of diastereomeric products. The reaction of (—) R-3-methyl-1-methylencyclohexane, C8Hi4, with the Pd-salt confirms that during the reaction between C8Hi2 and <mns-PdCl2(C6H5CN)2 no free C8H14 is formed in solution. Studies on cleavage reactions of the dimer are also described in this paper. 
  Reference    Z. Naturforsch. 34b, 579—584 (1979); eingegangen am 23. November 1978 
  Published    1979 
  Keywords    ji-Enyl Complexes, UV, m NMR 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0579.pdf 
 Identifier    ZNB-1979-34b-0579 
 Volume    34 
7Author    G. Schätzel, W. PreetzRequires cookie*
 Title    Tetrahalogeno -acetylacetonato -osmate (IV) Tetrahalogeno-acetylacetonato-osmates(IV)  
 Abstract    The complexes K[OsX4acac], X = Cl, Br, I, are prepared by treatment of K^fOsXß] with acetylacetone. The new compounds are characterized by their IR resp. visible and UV spectra which are highly resolved when measured on transparent pellets of the tetra-ethylammonium salts with KBr at 10 K. The influence of the different halide ligands on the bonding of the acac-group is discussed. 
  Reference    (Z. Naturforsch. 31b, 749—753 [1976]; eingegangen am 11. März 1976) 
  Published    1976 
  Keywords    Halogeno-acetylacetonato-osmates(IV), Synthesis, UV, IR, Mutual Ligand Influences 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-0749.pdf 
 Identifier    ZNB-1976-31b-0749 
 Volume    31 
8Author    Requires cookie*
 Title    Photolysis (A = 185 nm) of Liquid Acetaldehyde Dimethyl Acetal  
 Abstract    H e in z -P e t e r S c h u c h m a n n a n d C l e m e n s v o n S o n n t a g In stitut fü r Strahlenchemie im M ax-Planck-Institut für Kohlenforschung, Mülheim a. d. R uhr Deaerated liquid acetaldehyde dimethyl acetal has been photolyzed at X = 185 nm, and 28 products have been determined. The m ajor ones with their quantum yields are: methanol (0.59), methane (0.26), ethyl methyl ether (0.17), m ethyl vin yl ether (0.16), m ethyl form ate (0.14), ketene dimethyl acetal (0.1), ethane (0.06), hydrogen (0.06), and acetaldehyde (0.06). The m ajor prim ary processes are suggested to be the scission o f the C-OCH3 bonds (homolytic and molecular) and o f the O-CH3 bonds (homolytic). Minor processes are hydrogen elimination reactions and the scission o f the C-CH3 bond. 
  Reference    (Z. Naturforsch. 32b, 205 [1977]; received October 8 1976) 
  Published    1977 
  Keywords    UV, GC-MS, Quantum yields, Radical Reactions, Fragm entation Processes 
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 TEI-XML for    default:Reihe_B/32/ZNB-1977-32b-0205.pdf 
 Identifier    ZNB-1977-32b-0205 
 Volume    32 
9Author    Requires cookie*
 Title    Beiträge zur Chemie der Pyrrolpigmente, X V II1  
 Abstract    Struktur-und konformationsanalytische Untersuchungen am chromophoren System der Bilivioline [Biladiene-(a.b)] On the Chemistry of Pyrrole Pigments, X V II Investigations of Structure and Conformation of the Chromophoric System of Biliviolines [Biladienes-(a,b)] H e i n z F a l k , S t e f a n G e r g e l y , K a r l G r u b m a y r u n d O t m a r H o f e r The {Z,Z)-configuration of the bilivioline chromophoric system was established in ­ vestigating an appropriate model compound by means of pK measurement, X H NMR spectroscopy Lanthanide ion induced shift technique, electron absorption spectroscopy and P P P calculations. Moreover a syn-syn conformation which is twisted at the a-methine single bond and planar within the pyrromethene unit (based on the concept of partial structures of bile pigments) of the molecule was deduced. 
  Reference    (Z. Naturforsch. 32b, 299—303 [1977]; eingegangen am 12. November 1976) 
  Published    1977 
  Keywords    !H NMR, Lanthanide Shifts, PP P calculations, UV, Tautomeric Equilibrium 
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 TEI-XML for    default:Reihe_B/32/ZNB-1977-32b-0299.pdf 
 Identifier    ZNB-1977-32b-0299 
 Volume    32 
10Author    Latif Rateb, B. Azmy, M. A. Nashed, M. F. IskanderRequires cookie*
 Title      
 Abstract    A series of benzoylacetaldehyde benzoylhydrazones were prepared and characterised. Their UV, IR, and iH NMR spectra suggest the enol-imine structure rather than the keto-imine form of analogous Schiff bases. The pKa values of these aroylhydrazones were also measured and correlated with the Hammet substitution constants. Attempted cyclizations of these open-chain aroylhydrazones afforded the corresponding 5-hydroxy-2-pyrazoline compounds rather than the expected pyrazoles. 
  Reference    Z. Naturforsch. 33b, 1527—1534 (1978); received July 24 1978 
  Published    1978 
  Keywords    Benzoylacetaldehyde Benzoylhydrazone, 5-Hydroxy-2-pyrazolines, UV, Tautomerism, Enol-imines 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-1527.pdf 
 Identifier    ZNB-1978-33b-1527 
 Volume    33