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  • 1
    Electronic Resource
    Electronic Resource
    Photoelectron Spectra of Unsaturated Oxides. I. 1,4-Dioxin and related systems (1978)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 61 (1978), S. 1388-1398 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The He (Iα) photoelectron spectra of the four unsaturated oxides 3,4-dihydropyran (6), γ-pyran (7), 2, 3-dihydro-1, 4-dioxin (9) and 1, 4-dioxin (10) are reported and analysed. Band assignments are based on ab-initio calculations, using the STO-3G basis set. The proposed orbital sequences (with reference to the coordinate systems given in Table 1) are, for the top three orbitals: 6, π, nσ, nπ; 7, 3b1(π), 1a2(π), 11a1(σ); 9, 11b(π), 12a(σ), 11a(π); 10, 2b3u(π), 1b1g(π), 6ag(σ). Finally the (almost) localized π-orbitals have been computed by the Foster-Boys localization procedure.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19780610422
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  • 2
    Electronic Resource
    Electronic Resource
    Alicyclische Verbindungen, II. Darstellung und Photoelektronenspektren der Cyclopropanierungsprodukte von 3,4-Dimethylen-1-cyclobuten (1979)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 3691-3702 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Alicyclic Compounds, II. Preparation and Photelectron Spectra of the Cyclopropanation Products of 3, 4-Dimethylene-1-cyclobuteneCyclopropanation of 3, 4-Dimethylene-1-cyclobutene (1) with diazomethane/cuprous chloride in pentane provides the novel spiro compounds 6-methylenespiro[2.3]hex-4-ene (2) and dispiro[cyclopropane-1, 2′-bicyclo[2.1.0]pentane-3′, 1″-cyclopropane] 94) as well as the already known dispiro[2.0.2.2]oct-7-ene (3). The photoelectron spectra of these hydrocarbons have been analyzed.
    Notes: Die Cyclopropanierung von 3,4-Dimethylen-1-cyclobuten (1) mit Diazomethan/Kupfer (I) chlorid in Pentan liefert die neuen Spiroverbindungen 6-Methylenspiro [2.3]hex-4-en (2) und Dispiro[cyclopropan-1,2′-bicyclo[2.1.0]pentan-3′,1″-cyclopropan] (4) sowie das bekannte Dispiro [2.0.2.2]oct-7-en (3). Die Photoelektronenspektren dieser Kohlenwasserstoffe werden diskutiert.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19791121117
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  • 3
    Electronic Resource
    Electronic Resource
    The Ionization Energies of Di-n-Alkyl Diacetylenes (1977)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 60 (1977), S. 1697-1700 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The He(Iα) photoelectron spectra and the ionization energies of symmetrically substituted di-n-alkyl-diacetylenes R-(C≡C)2-R (with R = CH3, C2H5, n-C3H7, n-C4H9) are presented. The effect of the alkyl substitutents is that the two acetylenic ionization energies, Iv,1 and Iv,2, shift by the same amount, i.e. their difference Iv,2 - Iv,1 remains constant (2.45 ± 0.05 eV). Between 12.5 eV and 17 eV the band system in the photoelectron spectrum of R-(C≡C)2-R is superimposable with that in the spectrum of the corresponding alkane, RH, with the exception of a uniformly small shift of all the bands to higher ionization energy.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19770600525
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  • 4
    Electronic Resource
    Electronic Resource
    The Photoelectron Spectrum of TetrafluorobutatrienePart 1 of: ‘Some Comments on the Perfluoro Effect’.Dedicated to the memory of Heinrich Labhart (1978)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 61 (1978), S. 46-58 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The He(Iα) and He(IIα) spectra of tetrafluorobutatriene 3(F) have been recorded for comparison with those of butatriene 3(H). Ab initio double-zeta basis self-consistent field (SCF) and configuration interaction calculations on butatriene show that, contrary to previous assignment, no shake-up band is expected to appear in the 9-10 eV energy range of the photoelectron spectrum. Further, such SCF calculations on tetrafluorobutatriene support the use of the perfluoro effect in assigning the purely π orbital ionizations. It is argued that 3(F) is a key compound for the study of the perfluoro effect. This is supported by a qualitative comparison of its photoelectron-spectroscopic results with those of other perfluoro systems.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19780610105
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  • 5
    Electronic Resource
    Electronic Resource
    The Electronic Structure of Cubane (C8H8) as Revealed by Photoelectron Spectroscopy (1978)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 61 (1978), S. 547-557 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: High resolution He (Iα) and He (IIα) photoelectron spectra of cubane are reported. The assignments of the bands to different states of the cubane radical cation are made on the basis of ab initio STO-3G and MINDO/3 calculations, using geometries optimized within each treatment. The vibrational fine-structure observed supports the proposed assignment. An open shell MINDO/3 model for ground state cubane radical cation suggests that the Jahn-Teller distorted system fluctuates between twelve equivalent structures of C2v-symmetry. Localized molecular orbitals derived from the STO-3G model of cubane indicate that the major feature which discriminates this molecule with respect to other hydrocarbons is the large interaction matrix element between the opposed CC-σ-orbitals of each face.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19780610202
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  • 6
    Electronic Resource
    Electronic Resource
    Electronic states of di-t-butylpolyacetylene radical cations (1978)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 61 (1978), S. 2040-2046 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The π-ionization energies of the di-t-butylpolyacetylenes with two, three, four and five conjugated triple bonds have been determined by He (Iα) photoelectron spectroscopy. The assignment of the bands to the Π-states of the corresponding radical cations follows from simple correlations in agreement with previous experience. The influence of the t-butyl groups on the ionization energies is rationalized in terms of traditional, qualitative arguments assuming an inductive and/or hyperconjugative mechanism. However, a more careful analysis shows that the ‘The -higher-the-ionization-energy-the-higher-the-alkyl-induced-shift’ rule is not always true.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19780610611
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  • 7
    Electronic Resource
    Electronic Resource
    Experience with negatively charged polyurethane-backed velours (1971)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 5 (1971), S. 75-81 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: This report concerns the modification of a velour fabric for use in the vascular system. A specially prepared polyurethane was sprayed on the outer surface of this fabric resulting in a negative surface charge. The advantages of this composite were the incorporation of a thin layer of neointima onto the velour surface. Because of its thinness, viability was maintained resulting in a living nonthrombogenic layer at the vascular interface. To prove the efficacy of this material the authors have implanted it into the right atrium, replaced segments of the inferior vena cava, replaced the 4-mm carotid artery, and have used it in the construction of an artificial ventricle device. All performed in a superior fashion with long-term promotion of a viable neointima. It is hoped that the concept of negatively charged velours may be applicable to other phases of biomaterial development.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820050209
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  • 8
    Electronic Resource
    Electronic Resource
    Carbon-13 chemical shifts and carbon-proton coupling constants in 4H- and 9aH-quinolizine esters and some of their methyl derivatives (1987)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 25 (1987), S. 396-401 
    Details
    ISSN: 0749-1581
    Keywords: Quinolizines ; 13C NMR chemical shifts ; CH coupling constants ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The proton coupled and decoupled 13C NMR spectra of 4H-quinolizine 1,2,3,4-tetracarboxylate and its less stable tautomer 9aH-quinolizine 1,2,3,4-tetracarboxylate have been investigated. All 13C resonances have been assigned, and a number of the one-, two- and three-bond carbon-proton coupling constants obtained for these compounds and some of their methyl derivatives. The principal conclusion from the data is that the nitrogen atom is positively charged as a result of extensive conjugation.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260250503
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  • 9
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    Sustainable management of biosolid phosphorus: a field study (2016)
    Wiley-Blackwell
    Details
    Publication Date: 2016-05-25
    Description: Stabilized wastewater biosolids are a renewable resource for improving soil and crop quality, but their regular application can rapidly elevate soil available phosphorus (P) (e.g. Olsen-P[OP]) leading to increased transfer of soluble reactive P (SRP) in land run-off causing eutrophication. To assess the eutrophication risk of biosolid P recycling, 143 arable fields with different biosolid P input histories, and representing different soil type and biosolid type combinations, were sampled and their P chemistry determined. Differences in soil total P between the surveyed fields were used as the best measure of net biosolid P inputs. Rates of soil OP increase (range 3–11% of soil total P, mean 7%) were lowest on a P-fixing soil and tended to increase more on sandy soils (6–9%) and on loamy soils receiving biosolids dosed with both iron (Fe) and lime (9–11%). Potential release of SRP to run-off was measured as water-extractable P (WEP) and varied widely (6–52% of soil OP). WEP concentrations were lowest on clayey soils, and where biosolids containing P-binding elements [calcium (Ca) or Fe, but not together] were applied. The relationship between OP and WEP was therefore highly dependent on both soil type and biosolid type. However, analysis of soil P sorption parameters indicated that eutrophication risk on loamy and clayey soils was significantly reduced when OP represented 〈20% of the soil P sorption capacity. Our results suggest that biosolids could be more sustainably managed by matching biosolid type to soil type and P fertility status.
    Print ISSN: 0266-0032
    Electronic ISSN: 1475-2743
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Wiley-Blackwell
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  • 10
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    Anatomy of an observed African easterly wave in July 2006 (2011)
    Wiley-Blackwell
    Details
    Publication Date: 2011-04-19
    Description: The detailed structure of an African easterly wave (AEW) observed during the AMMA field campaign is analysed. The wave was present from 25 to 29 July 2006. A complex circulation pattern was observed: the overall structure of convection and the positive vorticity of the trough region had an elongated inverted-V appearance, wrapped around an area of low winds and clear skies. Satellite imagery showed that the AEW was a significant influence on the modulation of convection on the large scale. The wave was identified initially through its strong signature on soil moisture and convection. The AEW structure observed was not anticipated and has not been discussed in previous literature. In addition, wave tracking using a Hovmöller diagram of meridional winds did not detect the wave, and a Hovmöller of vorticity showed the wave moved at a slower speed than other AEWs in July. New schematics explaining the structure are presented, describing the case as observed by satellites and analysed by a limited-area version of the Met Office Unified Model. It is proposed that the positive vorticity branches of the inverted-V can be regarded as analogous to atmospheric fronts, with characteristic gradients in winds and thermodynamic properties, acting as locations for enhanced convection. The implications of the new case are discussed in relation to previous theory and it is suggested that the accepted model of an idealised AEW is incomplete and should be extended to include more complex structures. Copyright © 2011 Royal Meteorological Society and British Crown Copyright, the Met Office
    Print ISSN: 0035-9009
    Electronic ISSN: 1477-870X
    Topics: Geography , Physics
    Published by Wiley-Blackwell
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