Cation‐Dependent Nonlinear Optical Behavior in an Octupolar 3D Anionic Metal–Organic Open Framework

Abstract

A holey host: An octupolar porous metal–organic framework with a Td-symmetric supercage structure (see picture; green: center of the octapolar structure) exhibits a powder second harmonic generation (SHG) intensity about 15 times higher than that of KH2PO4. This anionic open framework is highly thermally stable, displays high ion-exchange capacities with the cations NH4+, Na+, and K+, and, more importantly, exhibits an unprecedented cation-dependent NLO activity.