Synthesis of Optically Active V-Shaped Molecules: Studies on the Orientation of the Stacked π-Electron Systems and their Chiroptical Properties

Chiral π-stacked molecules were prepared from planar chiral bis-(para)-pseudo-meta-type [2.2]paracyclophane. π-Electron systems were stacked to form a V-shaped structure with an angle of 120°. Optical and chiroptical properties were experimentally and theoretically investigated and compared with those of the V-shaped molecules comprising the same π-electron systems based on bis-(para)-pseudo-ortho-type [2.2]paracyclophane with an angle of 60°.