Abstract
Largedissymmetry factor of the circularly polarized luminescence (gCPL) was observed in ligand andcoordinationtuned chiral tetrakis europium (Eu(III)) complexes with ammonium cations. ThegCPLvalue was estimated to be -1.54,which is the largest among chiral luminescent molecules. Through photophysical measurements,single crystal X-ray structural analysesand quantum chemical calculations, changes in the geometric and electronic structures were observed for a series of chiral tetrakis Eu(III) complexes which enhanced thegCPLvalue.The emission quantum yield andphotosensitized energy transfer efficiencies of chiral Eu(III) complexes with ammonium cations were also larger than that with previous Cs+.Based on the systematicmodifications and analyses for chiraltetrakisEu(III) complex, effect of the ammonium cation on enhanced CPL brightness is reported.
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