| | 2 | Author
| Von Galvinoxyl-Mehrspinsystemen, W. Gierke, W. Harrer, B. Kirste, H. Kurreck, J. Reusch, Herrn Prof, G. Dr, Manecke | Requires 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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| default:Reihe_B/31/ZNB-1976-31b-0965.pdf | | | | Identifier
| ZNB-1976-31b-0965 | | | | Volume
| 31 | |
| 3 | Author
| Jürgen Keim | Requires 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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| default:Reihe_B/34/ZNB-1979-34b-0995.pdf | | | | Identifier
| ZNB-1979-34b-0995 | | | | Volume
| 34 | |
| 4 | Author
| A. Scheffler, UndW. Preetz | Requires 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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| default:Reihe_B/31/ZNB-1976-31b-1099.pdf | | | | Identifier
| ZNB-1976-31b-1099 | | | | Volume
| 31 | |
| 5 | Author
| Tetraphenylphosphonium-Isopolymolybdates, Roger Grase, Joachim Fuchs | Requires 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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| default:Reihe_B/33/ZNB-1978-33b-0533.pdf | | | | Identifier
| ZNB-1978-33b-0533 | | | | Volume
| 33 | |
| 6 | Author
| Richard Ratka, ManfredL. Ziegler, Gerhard Schilling | Requires 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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| default:Reihe_B/34/ZNB-1979-34b-0579.pdf | | | | Identifier
| ZNB-1979-34b-0579 | | | | Volume
| 34 | |
| 7 | Author
| G. Schätzel, W. Preetz | Requires 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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| default:Reihe_B/31/ZNB-1976-31b-0749.pdf | | | | Identifier
| ZNB-1976-31b-0749 | | | | Volume
| 31 | |
| 8 | Author
| | 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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| default:Reihe_B/32/ZNB-1977-32b-0205.pdf | | | | Identifier
| ZNB-1977-32b-0205 | | | | Volume
| 32 | |
| 9 | Author
| | 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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| default:Reihe_B/32/ZNB-1977-32b-0299.pdf | | | | Identifier
| ZNB-1977-32b-0299 | | | | Volume
| 32 | |
| 10 | Author
| Latif Rateb, B. Azmy, M. A. Nashed, M. F. Iskander | Requires 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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| default:Reihe_B/33/ZNB-1978-33b-1527.pdf | | | | Identifier
| ZNB-1978-33b-1527 | | | | Volume
| 33 | |
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