ABSTRACT
Helical twisting powers of a series of ruthenium complexes with screw-like Δ, Λ chirality were investigated in N-(4-Methoxybenzylidene)-4-butylaniline (MBBA). Λ-[Ru(acac)2(trop)] (acac = acetylacetonate, trop = tropolonate) shows a fairly low HTP of 18 µm−1, while we found that the HTP increased almost double by connecting with an achiral bulky unit [Ru(Cp)(dppe)] (Cp = cyclopentadienyl, dppe = 1,2-bis(diphenyl)phosphinoethane) that was found to behave as a molecular “picket fence” to force the orientation of surrounding MBBA molecules.
Funding
This work was financially supported by Kitasato University Research Grant for Young Researchers, Futaba Denshi Foundation, and JSPS KAKENHI, Grant-in-Aid for Young Scientists (B), Grant Number 16K21353.