Highly Dynamic and Tunable Behavior of 1D Coordination Polymers Based on the Bispidine Ligand

Abstract

Ligands L1 and L2 have been designed, synthesized, and used to build for the first time bispidine-based coordination polymers (CPs) in combination with Mn^II . The novel CPs have been structurally characterized by single-crystal (SC) and powder X-ray diffraction (P-XRD) techniques, showing that they are composed of 1D ribbon-like chains that adopt various arrangements depending on the trapped solvent species. These materials show highly dynamic behavior as they undergo heterogeneous solid/liquid and solid/vapor multiple solvent exchange processes, comprising crystalline-amorphous-crystalline, selective adsorption and SC-to-SC transformations, where major structural reorganization of the 1D ribbons are observed. By tuning inter-ribbon interactions through expansion of the ligand's accessible surface, the dynamic behavior can be effectively modulated.

Keywords: X-ray diffraction; bispidine; coordination polymers; exchange interactions; soft porous crystals; tunable properties.