Cover Feature: Benzo[1,3]oxathiol‐2‐one Motif‐Based a New Chromogenic Copillar[5]arene: Synthesis, Solid‐State Assembly, Photophysical Studies, and Colorimetric Recognition of S²⁻ (Chem. Asian J. 9/2025)

The cover picture highlights the synthesis of a new copillar[5]arene derivative that exhibits inclusion of ethyl acetate and acetonitrile involving supramolecular assemblies with different features. While ethyl acetate-occupied macrocycles give 2D arrangement, acetonitrile-occupied macrocycles create a rhombus-shaped molecular channel with a diameter of ~5.5 Å in 3D packing. It serves as a chromogenic sensor of sulfide. More details can be found in article number e202401653 by Subrata Ranjan Dhara, Nabajyoti Baildya, and Kumaresh Ghosh.