Cover Picture: Leveraging Crystalline and Amorphous States of a Metal‐Organic Complex for Transformation of the Photosalient Effect and Positive‐Negative Photochromism (Angew. Chem. Int. Ed. 11/2023)

Alternations of crystalline and amorphous states largely influence the solid-state properties of molecular materials. In their Research Article (e202217054), Dongpeng Yan and co-workers show that the transformation between two states of an anthracene-based metal-organic complex can tune the photosalient effect, mechanical luminescence, and photochromism behavior. The effect was assigned to competitive chemical routes between a photocycloaddition reaction in the crystalline state and photogenerated radicals in the amorphous state. Alternations of crystalline and amorphous states largely influence the solid-state properties of molecular materials. In their Research Article (e202217054), Dongpeng Yan and co-workers show that the transformation between two states of an anthracene-based metal-organic complex can tune the photosalient effect, mechanical luminescence, and photochromism behavior. The effect was assigned to competitive chemical routes between a photocycloaddition reaction in the crystalline state and photogenerated radicals in the amorphous state Covalent Organic Frameworks Batteries Hydrogels Nanozymes