Single-handed propeller structure was induced by circularly polarized light irradiation to three molecules with a flat core moiety and twisted periphery groups (wings). The molecules exhibited efficient blue circularly polarized luminescence.

Axial chirality was induced by circularly polarized light (CPL) irradiation to insoluble polymeric covalent organic frameworks (COF’s) as well as soluble hyperbranched polymers (HBP’s) composed of bezene-1,3,5-triyl groups as trigonal...

An unprecedented non-uniform self-folding of artificial polymer chains composed of turn moieties and stretched segments is presented through the design of a set of optically active poly(fluorene-2,7-diylethene-1,2-diyl) (poly(fluorenevinylene)) derivatives bearing a neomenthyl group and a pentyl group attached at the 9-position of fluorene backbone at various ratios. The folded structure is formed and stabilized through inter-chain interactions in the solid state, leading to remarkably enhanced chiroptical properties (chirality amplification) in terms of circular dichroism (CD) and circularly polarized light (CPL) emission. This phenomenon is rationalized by experimental and theoretical CD and CPL spectral analyses. The polymer arrangements in the solid state were further assessed through transmission electron microscopic observations combined with enhanced sampling molecular dynamics simulations in the solid state revealing the thin film organizations.

Traveling of carbon atoms in organic molecules was successfully achieved. The six-membered ring of dihydroindenyl moiety on titanium rotated based on the five-membered ring like a merry-go-round. Two carbons at the bridgehead of the dihydroindenyl moiety and the other three carbons of the five-membered ring were monitored by 13C-labeled experiments. The two carbons at the bridgehead moved to the farthest positions with the rotation of the six-membered ring. The intermediate where the two carbons were located at the farthest positions was isolated and fully characterized. Treatment of the intermediate with azobenzene made the two carbons come back to the starting positions. There is another viewpoint on this reaction. When the six-membered ring is fixed and the movement of three carbons of the five-membered ring of the dihydroindenyl moiety on titanium is focused, it was found that those three carbons moved around the six-membered ring and came back to the starting points.