Optical isomers of N,N′-bis(1-phenylethyl)-2,6-pyridinedicarboxamide coordinated to europium(iii) ions as reliable circularly polarized luminescence calibration standards

The synthesis of two optical isomers of N,N′-bis(1-phenylethyl)-2,6-pyridinedicarboxamide and the constant circularly polarized luminescence (CPL) activity of their acetonitrile trivalent europium complex solutions over a long period of time open new perspectives for performing accurate routine CPL calibration tests at low cost.