end of tetra(2-phenylthiazole) through a chiral phenylalanine spacer (D- or L-2o,
Fig. 8.6) [37]. The chiral spacer controls the handedness of a helix, arranging two
pyrene units in a chiral manner. The photochromism in the tetrathiazole unit gives
rise to a large structural change to form a ring-closed photoisomer 2c, changing the
position and orientation of two pyrene units.
UV
vis
D-2c
D-2o
Fig. 8.6 Synthetic scheme and photochromic reaction of pyrene-modified tetrathiazole 2
8 Photo-Switching of Circularly Polarized Luminescence
181
Fig. 8.6) [37]. The chiral spacer controls the handedness of a helix, arranging two
pyrene units in a chiral manner. The photochromism in the tetrathiazole unit gives
rise to a large structural change to form a ring-closed photoisomer 2c, changing the
position and orientation of two pyrene units.
UV
vis
D-2c
D-2o
Fig. 8.6 Synthetic scheme and photochromic reaction of pyrene-modified tetrathiazole 2
8 Photo-Switching of Circularly Polarized Luminescence
181