Photochromism of a radical diffusion-inhibited hexaarylbiimidazole derivative with intense coloration and fast decoloration performance
(Figure Presented) We report the synthesis and the photochromic behavior of a newly designed, photochromic, radical diffusion-inhibited hexaarylbiimidazole (HABI) derivative with markedly improved photochromic performance in coloration and decoloration rates as well as greater optical density in the colored state. The thermal bleaching rate (τ1/2 = 260 ms at 295 K) is the fastest among the reported ones for HABI derivatives.
Piperazine derivatives of formula(1),processes for their preparation, pharmaceutical compositions containing them in the treatment of CNS and other disorders and in their use in therapy as 5-HT1B antagonists are disclosed herein.
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(2010/11/30)
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