Abstract
The chelation properties of two photochromic spironaphthoxazine derivatives to divalent metal ions were studied in acetone. Two types of chelate can be observed in the absorption spectrum: an unstable chelate which is formed in the presence of Ni(NO 3) 2 or Co(NO 3) 2 on UV irradiation and may revert to the corresponding colourless form in the dark or by bleaching with visible light; the decolouration rate is decreased significantly compared with the metal-ion-free solution; a stable chelate with intense fluorescence emission, which cannot be bleached by visible light. From the influence of the structure of the spiro- oxazines and the nature and concentration of the metal ions and their counteranions on chelate formation, the structures of the two chelates and the mechanisms of the photoreaction and thermal reaction are discussed.
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Schedule a callMore From: Journal of Photochemistry & Photobiology, A: Chemistry
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