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  • 3,3-Dimethoxypropanoate  (1)
  • 31.50.+w  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Many-body effects in the highly excited state of fullerenes (1993)
    Springer
    Applied physics 57 (1993), S. 303-308 
    Details
    ISSN: 1432-0630
    Keywords: 33.50.Dq ; 71.35.+z ; 31.50.+w
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The highly excited state of fullerenes is characterised by a luminescence output which is dependent on the cube of the input intensity. This nonlinear emission is red shifted from the low-level emission and has a long, intensity dependent lifetime. Under similar irradiation conditions, the photoconductive response is seen to increase with the cube of the input intensity and the photocurrent in the highly excited state is observed to be largely independent of temperature, contrasting sharply with the thermally activated behaviour at low excitation densities. The degree of nonlinearity of the observed phenomena exclude an interpretation in terms of intra-molecular processes and the temperature dependence of the photoconductive response is suggestive of a Mott-like transition. The nonlinear behaviour is compared to that of indirect band-gap semiconductors in which the origin of similar nonlinear phenomena in the highly excited state luminescence and photoconductivity are explained in terms of electron-hole droplet formation. The similarities of the behaviours leads to a consideration of exchange and correlation energies in fullerenes, which are calculated according to a phenomenological model. Estimates of the contributions are consistent with a Mott-like transition at high excitation densities and an excess exchange/correlation energy in the highly excited state of ∼150 meV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332281
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  • 2
    Electronic Resource
    Electronic Resource
    Ozonolyse von Olefinen, III: Säurekatalysierte Ozonolyse von 3-Hexen-1,6-und 2-Penten-1,5-dicarbonylderivaten (1990)
    Springer
    Monatshefte für Chemie 121 (1990), S. 203-207 
    Details
    ISSN: 1434-4475
    Keywords: Ozonolysis ; 3-Hexene-1,6-dioic acid ; Glutaconic acid ; 3,3-Dimethoxypropanoate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The ozonolysis of mono-unsaturated compounds containing the structural element =CH-CH2-R [R=COOH, COOCH3, CH(OCH3)2] was investigated. Reductive ozonolysis of (E)-3-hexene-1,6-dioic acid gives methyl 3,3-dimethoxypropanoate (2), whereas ozonolysis of dimethyl (E)-3-hexene-1,6-dioate (1a) and (Z)-1,1,6,6-tetramethoxy-3-hexene (1b) in a methanolic solution of HCl leads to a mixture of2, dimethyl malonate (3 a) and 1,1,3,3-tetramethoxypropane (3 b). The homologuos derivatives, dimethyl glutaconate (4 a) and 1,1,5,5-tetramethoxy-2-pentene (4 b), were ozonized to give mixtures of2, 3, dimethyl oxalate (5), methyl 2,2-dimethoxyacetate (6 a), and 1,1,2,2-tetramethoxyethane (6 b). The ratios of the various reaction products were determined by gas chromatography. In each case the formation of the bifunctional derivatives2 and6 a was favoured.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00809533
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