New Molecular CPL Machine
We present a non-convensional controlling the CPL signs of binaphthyl rings (1 and 2) carrying carboxylic acids as chiral ligands toward Eu(III) ions; 1 carries directly carboxylic acids, while 2 has two oxymethylene spacers between the ring and the acids. Although 1 and 2 have the same absolute configuration, insersion of two oxymethylene spacers to 1 between the ring of and the acids, 2 allows to induce the opposite signs of CPL signals at 5D0→7F1 and 5D0→7F2 transitions of Eu(III), whilst 1 and 2 have the same sign of CD bands at the first Cotton bands.
Swapping circularly polarised luminescence of Eu(III)-binaphthyl hybridized luminophore with and without oxymethylene spacer. Hara, N.; Okazaki, M.; Shizuma, M.; Marumoto, S.; Tajima, N.; Fujiki, M.; Imai, Y. ChemistrySelect, 2, 10317-10322.
DOI: 10.1002/slct.201701460. (Cover Picture)