Remarkable 980 nm circularly polarized luminescence from dinuclear Yb(iii) helicates with a D₄ symmetry

Chiral BINOL-modified dinuclear helicates Yb 2 ( R / S -BTHP) 4 show the excellent NIR-CPL at 980 nm with the g lum reaching up to 0.81 and B CPL being up to 821 M −1 cm −1 .