Studies under Continuous Irradiation of Photochromic Spiro[fluorenopyran-thioxanthenes]

Studies under Continuous Irradiation of Photochromic Spiro[fluorenopyran-thioxanthenes]

New indeno‐fused spiro[benzopyran‐thioxanthenes] were synthesized (see 3a–d in Scheme 3) and their photochromic properties evaluated under continuous irradiation (Table 1). When submitted to irradiation for several minutes with a Xe lamp, the system behaved as one constituted by two open colored for...

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Veröffentlicht in:Helvetica chimica acta 2004-06, Vol.87 (6), p.1400-1410
Hauptverfasser: Salvador, Maria A., Coelho, Paulo J., Burrows, Hugh D., Oliveira, M. Manuel, Carvalho, Luis M.
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container_end_page 1410
container_issue 6
container_start_page 1400
container_title Helvetica chimica acta
container_volume 87
creator Salvador, Maria A.
Coelho, Paulo J.
Burrows, Hugh D.
Oliveira, M. Manuel
Carvalho, Luis M.
description New indeno‐fused spiro[benzopyran‐thioxanthenes] were synthesized (see 3a–d in Scheme 3) and their photochromic properties evaluated under continuous irradiation (Table 1). When submitted to irradiation for several minutes with a Xe lamp, the system behaved as one constituted by two open colored forms with different thermal bleaching rates and different susceptibilities to degradation. An increase in irradiation time led to significant degradation and to the apparent predominance of the open colored form with the faster bleaching rate.
doi_str_mv 10.1002/hlca.200490128
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title Studies under Continuous Irradiation of Photochromic Spiro[fluorenopyran-thioxanthenes]
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