Three Co(II)-containing coordination polymers displaying solvent determined entanglement structures and different ammonia and amines selective sensing properties

Abstract

Nowadays it is necessary to develop selective sensing materials of ammonia and amines because toxic ammonia and amines are widely distributed in the environment. In this work, π-electron-deficient N,N′-di(4-pyridyl)-1,4,5,8-naphthalene diimide ligand was used to construct coordination polymers with selective sensing behaviors towards electron-rich ammonia and amines vapors. Three coordination polymers 1–3 with solvents dependent entanglement structures have been successfully synthesized. Compounds 1 and 3 display similar 2D + 2D → 3D polycatenation architectures, but they have pores with different sizes that can accommodate different lattice solvent molecules. Compound 2 exhibits a 3D 2-fold interpenetrating framework with a 6-connected pcu net. Compounds 1 and 3 can selectively sense ammonia and amines vapors in solid state through visual color changes with different response time.