The development of molecular materials whose physical properties can be controlled by
external stimuli—such as light, electric field, temperature, and pressure—has recently …

This Review discusses the structure–property relationships in chiral molecules,
macromolecules (polymers), and supramolecules (crystals, liquid crystals, or thin films) …

Smart materials with ultralong phosphorescence are rarely investigated and reported.
Herein we report on a series of molecules with unique dynamic ultralong organic …

In recent years, research dealing with organic paramagnetic compounds such as stable
radicals and high-spin systems has been focused on applied aspects. Several key trends …

While viologen derivatives have long been known for electrochromism and photochromism,
here we demonstrated that a viologen-carboxylate zwitterionic molecule in the crystalline …

Persistent covalent-organic framework (COF) radicals hold important applications in
magnetics and spintronics; however, their facile synthesis remains a daunting challenge …

Conspectus Since the pioneering work by Thiele and Chichibabin, who synthesized the first
diradicals bridged by phenylene and biphenylene groups in 1904 and 1907, respectively …

While stimuli-responsive chromic phenomena are well known for various viologen-
containing organic and metal–organic materials, viologen-based piezochromism is a very …

Piezochromic luminescent materials with multi-color switching have recently attracted much
attention owing to their appealing applications in the field of advanced photonics, such as …

Spin–Spin interactions between unpaired electrons in organic radicals are of utter
importance from the viewpoint of molecular magnetism and the development of smart …