Fig. 1
Synthesis and characterization of complexes. Self-assembly of quadruple-stranded Eu(III) helicates by the ligands L1S (a) and L2S (b). ESI-TOF–MS spectrum of (NEt4)2[Eu2(L1S)4] (c) and (NEt4)2[Eu2(L2S)4] (d). 1 H NMR (400 MHz) spectra of L1S (e), L2S (f), (NEt4)2[Eu2(L1S)4] (g) and (NEt4)2[Eu2(L2S)4] (h) in CD3CN.
