Abstract
The circularly polarized luminescence (CPL) signs of Eu(III) luminophores coordinated to axially chiral binaphthyl derivatives carrying acetic acid residues [(R,R,R)-4] were inverted compared to those bearing compounds (R)-1–3 by inserting bulky naphthalene units into the binaphthyl backbone. The suitable steric difference between the phenyl group and the highly bulky naphthalene group on the binaphthyl backbone causes a chiral coordination change for all ligands on Eu(III). This substituent domino effect on the 1,1,1,5,5,5-hexafluoro-pentane-1,4-dione (hfa) ligands on Eu(III) caused by the bulky naphthyl group on the binaphthyl ligand causes the apparent change of the CPL sign in the photo-excited state, although (R)-1–3/Eu and (R,R,R)-4/Eu exhibited the same circular dichroism sign in the ground state.
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