Alkoxylated Fluoranthene‐Fused [3.3.3]Propellanes: Facile Film Formation against High π‐Core Content

Solid‐state assembling modes are as crucial as the chemical structures of single molecules for real applications. In this work, solid‐state structures and phase‐transition temperatures are investigated for a series of fluoranthene‐fused [3.3.3]propellanes consisting of a rigid three‐dimensional (3D) π‐core and varying lengths of alkoxy groups. Compounds in this series with n ‐butoxy or longer alkoxy groups take an amorphous state at room temperature. In these molecules, rotatable biaryl‐type bonds are not incorporated and high D 3h molecular symmetry is retained. Therefore, π‐fused [3.3.3]propellanes present a unique platform for amorphous molecular materials with low ratios of flexible alkoxy atoms to rigid π‐core ones.