1. Design, Synthesis, and Photochromism Studies of Photo-Switchable Bispiropyran Polymers
Tomoko Fujiwara, Department of Chemistry, The University of Memphis
Spiropyrans/spirooxazines are a class of photochromic compounds whose molecular structures are alterable upon exposure to UV/visible light or changes in temperature. The typical reaction of spiropyran is the conversion between the non-polar Sp form with the polar MC forms. We have designed a functional polymers having unique spiro “dimer” compound at the terminus. The polar face of the MC form dimer strongly attracts ionic species which can be released through visible light due to the transformation into the non-polar Sp form.
Major outcomes include: 1) Spiropyran dimer
(BIPSD) and spirooxazine dimer (SPOD) have
been successfully synthesized. 2) The dimers and
their polymer conjugates have shown unique
solvatochromism and photochromism kinetics
results, and specific binding abilities with Pd catalyst.
3) The self-assembly structures such as micelles and
functionalized surfaces have been constructed by the
photoswitch dimers. + - UV
heat or vis
Photochromism of spirooxazine dimer MC + -
Pd(PPh3)2Cl2UV
Thermal
Absorbance spectra
with UV irradiation
Sp form
Optimized MC-Pd cat. by Ampac (PM6)