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  • Electronic Resource  (2)
  • Theoretical, Physical and Computational Chemistry  (1)
  • open form  (1)
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  • Electronic Resource  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Effect of complexation on spectral and kinetic properties of crown-substituted photochromic spironaphthoxazines (1996)
    Springer
    Russian chemical bulletin 45 (1996), S. 2105-2108 
    Details
    ISSN: 1573-9171
    Keywords: spironaphthoxazine ; open form ; lifetime ; activation energy ; absorption spectrum ; luminescence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The insertion of benzo-15-crown-5 or benzo-18-crown-6 as a substituent at the 9'-position of a spironaphthoxazine molecule increases the lifetime of the open form of spironaphthoxazine by a factor ofca. 2. The complex formation between the crown groups and Mg2+ or Ba2+ ions changes the lifetime slightly. The addition of benzo-18-crown-6 at the 5'-position leads to an increase in the lifetime of the open form by an order of magnitude and the appearance of absorption with a maximum at 16420 cm−1 under dark conditions, which testifies to the stabilization of the open form. The addition of Ba2+ ions to this compound results in a further increase in the lifetime byca. 35% due to complex formation. The luminescence of the benzo-15-crown-5-substituted compound is probably caused by both the complexation with Mg2+ and the photochemical reaction induced by photoactive light and is accompanied by the irreversible loss of photochromism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01430719
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Structure-visible absorption relationship in the photochromic spiro[indoline-naphthoxazine] series (1996)
    Chichester : Wiley-Blackwell
    Journal of Physical Organic Chemistry 9 (1996), S. 262-264 
    Details
    ISSN: 0894-3230
    Keywords: Chemistry ; Theoretical, Physical and Computational Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: From a set of photochromic spiro[indoline-naphthoxazines] substituted on the oxazine part, a correlation between the electronic charge of the 2′-carbon atom and the absorption wavenumbers of the corresponding coloured forms was found. This relationship is of particular interest to predict the colour developed by this class of photochromic compounds.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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