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  • 1
    Electronic Resource
    Electronic Resource
    Exchange Coupling Parameters and Energy Levels for Cyclic Metal-Radical Complexes of Bis(hexafluoroacetylacetonato)manganese(II) with 5-tert-Butyl-1,3-phenylenebis(N-tert-butylaminoxyl) and (4-N-tert-Butyl-N-oxyamino)pyridine (2000)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 2000 (2000), S. 211-216 
    Details
    ISSN: 1434-1948
    Keywords: Manganese ; Radicals ; Cyclic dimer complexes ; Exchange coupling parameters ; Spin states ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Temperature-dependent paramagnetic susceptibility data for two cyclic dimer complexes of bis(hexafluoroacetylacetonato)manganese(II) with 5-tert-butyl-1,3-phenylenebis(N-tert-butylaminoxyl) and 4-(N-tert-butyl-N-oxyamino)pyridine have been analyzed to obtain two sets of two intramolecular exchange coupling parameters J1 and J2. A previous model, based on one of these interactions being much weaker than the other, could not be explicitly correlated to these actual exchange-coupling parameters. However, the energy levels of the low-lying spin states were found to be reproduced reasonably well by the approximate method.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 2
    Electronic Resource
    Electronic Resource
    Nondipolar Structures With Threefold Symmetry For Nonlinear Optics (1997)
    Weinheim : Wiley-Blackwell
    Chemistry - A European Journal 3 (1997), S. 1765-1773 
    Details
    ISSN: 0947-6539
    Keywords: cyanines ; hyper-Rayleigh scattering ; nonlinear optics ; second-order polarizability ; triazines ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The second-order polarizabilities β( -  2ω; ω, ω) of six nondipolar NLO chromophores - 1,3,5-tris(isopropyl-amino)-2,4,6-trinitrobenzene (1), 1,3,5-tris(isopropylamino)-2,4,6-tris(trifluoro-methylsulfonyl)benzene (2), tris(dimethyl-imoniomethyl)methide diperchlorate (3), 2,4,6-tris[4-(N,N-diethylamino)phenyl-ethynyl]-1,3,5-triazine (4), 2,4,6-tris[4-(N,N-diethylamino)phenyl]-1,3,5-triazine (5), and tris(2-dimethylaminoethenyl)-methinium perchlorate (6) - were studied by polarized hyper-Rayleigh scattering (HRS). The NLO activity of these two-dimensional NLO chromophores is attributed to three-level contributions to the β values, for which different optimization strategies are investigated. Exceptionally large second-order polarizabilities were observed for the conjugationally elongated structures: the β value of triazine 4 is 15 times larger than that of the one-dimensional two-level chromophore 4-nitroaniline. Results obtained with the polarized HRS experiment are discussed with respect to local field corrections, calibration, and systematic sources of error.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chem.19970031107
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    On the formation and solvolysis of 4-aryl-2,2-difluoro-6-methyl-1,3,2-(2H)-dioxaborines (1997)
    New York, NY [u.a.] : Wiley-Blackwell
    Heteroatom Chemistry 8 (1997), S. 147-155 
    Details
    ISSN: 1042-7163
    Keywords: Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The condensation of aryl methyl ketones 6 with acetic anhydride 4a in the presence of the boron trifluoride-acetic acid adduct 7 gives rise to the formation of 4-aryl-2,2-difluoro-6-methyl-1,3,2-(2H)-dioxaborines 8 in satisfactory yields. The stable 4-aryl-2,2-difluoro-6-methyl-1,3,2-(2H)-dioxaborines 8 can be transformed by hydrolysis into the corresponding aroylacetones 9. The reaction was optimized so as to avoid the formation of by-products, such as 2,4-diaryl-6-methylpyrylium tetrafluoroborates 11 or self-condensation products. © 1997 John Wiley & Sons, Inc.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
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