The synthesis of the tris chelate type ruthenium complex and the mesophase formation at the room temperature

Abstract

Tris(chelate) metal complexes are interesting structural motifs due to the propeller-shaped chirality called Δ, Λ isomerism. Although several pioneering works have been performed for racemic tris(chelate) metallomesogens, the effect of Δ, Λ chirality on the molecular arrangement and liquid crystal properties remains unclear. Here we report two types of tris(chelate) ruthenium complexes, which were optically resolved into Δ, Λ isomers with HPLC. In the polarized microscope observation, racemic and enantiomeric complexes were found to exhibit different textures attributed to different mesophase formation.