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The synthesis, photophysi
cal properties, and stru
ctural
chara
cterization of a photodimerizable ditopi
c ligand are des
cribed. Upon irradiationat 366 nm, ligand
1 dimerizes to the head-to-tail tetra-bpy ligand
2. This thermally stable photodimer
can be disso
ciated ba
ck to
1 using higherenergy irradiation (254 nm).