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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