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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.
Liu et al. (Thu,) studied this question.