Self-assembled lanthanide-based helixes: synthetic control of the helical handedness by chirality of the ligand

The control of the self-assembly of lanthanide helical chain and their helical handedness have been investigated for the first time. Δ- and Λ-form lanthanide chain complexes were obtained by introducing thiazolidine ligands that were synthesised from l - and d -cysteine, respectively, and shared the same formula: [Ln 2 (L) 3 (H 2 O) 5 ] ∞ ·3H 2 O (Ln: Sm and Eu) (L: 2-(2-hydroxy-3,5-dinitrophenyl)thiazolidine-4-carboxylic acid). The crystallographic, circular dichroism, and luminescence properties of these novel lanthanide chain complexes were studied. Chiral lanthanide chains with a helical metal arrangement were synthesized and the helical handedness can be derived from chirality transfer of the ligands.