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Synthesis and characterization of novel diazenes bearing pyrrole, thiophene and...
Raposo, M. Manuela M.; Fonseca, A. Maurício C.; Castro, M. Cidália R.; Belsley, M.; Cardoso, M. Fátima S.; Carvalho, Luís M.; Coelho, Paulo J.Two series of novel thermally stable second-order nonlinear optical (NLO) and photochromic chromophores have been designed and synthesized. The two series of compounds were based on different combinations of donor groups (pyrrole or thienylpyrrole) which act simultaneously as Π-conjugated bridges, together with diazoaryl or diazothiazolyl as acceptor moieties. Their photochromic and electrochemical behavior wer...
Studies under Continuous Irradiation of Photochromic Spiro[fluorenopyran-thioxa...
Salvador, Maria A.; Coelho, Paulo J.; Burrows, Hugh D.; Oliveira, M. Manuel; Carvalho, Luís M.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 irradiatio...
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