A Multifunctional, Charge‐Neutral, Chiral Octahedral M₁₂L₁₂ Cage

Abstract

A chiral, octahedral M12L12 cage, which is charge neutral and contains an internal void of about 2000 Å3, is reported. The cage was synthesised as an enantiopure complex by virtue of amino‐acid‐based dicarboxylate ligands, which assemble around copper paddlewheels at the vertices of the octahedron. The cage persists in solution with retention of the fluorescence properties of the parent acid. The solid‐state structure contains large pores both within and between the cages, and displays permanent porosity for the sorption of gases with retention of crystallinity. Initial tests show some enantioselectivity of the cage towards guests in solution.

The rise of metal–organic polyhedra

“…Another linker type for octahedral MOPs includes naphthalene diimide-based linkers. 79,80 Mollick et al utilized linkers with a naphthalene diimide core and terminal amino acid moieties (B9 to B12), leading to bent angles of carboxylic acid groups. 79 Four Cu 2 -based octahedral MOPs were prepared with different amino acid moieties, alanine, valine, isoleucine, and phenylalanine, and increased chemical stability was shown.…”

Understanding Gas Storage in Cuboctahedral Porous Coordination Cages

“…34 Hybrid metal-organic cages—also known as metal organic polyhedra 35 have been shown to adopt analogous structures, such as octahedral and cuboctahedral cages (Figure 1), but have displayed relatively limited porosity. 36,37,38 We aim to both expand the scope of porous metal-organic molecular materials and utilize spectroscopic, computational, and diffraction methods to better understand adsorption phenomena in them. In addition to the benefits of porous molecules mentioned above, the cation sites in hybrid metal-organic porous molecules could serve as sites for selective gas adsorption, gas storage, small molecule activation, or redox chemistry.…”

Room-temperature preparation of a chiral covalent organic framework for the selective adsorption of amino acid enantiomers

“…9,10 Adsorption separation based on porous materials has shown advantages due to their strong chiral recognition ability, longterm stability, and less complexity. 11 The exploration of chiral-functionalized porous materials as adsorbents for the highly efficient resolution of enantiomers has received extensive attention; these materials include metalorganic frameworks, 12,13 porous organic cages, 14,15 metalorganic cages 16,17 and composite porous materials. 18 However, the type of adsorbents for enantioselective adsorption was far more enough due to its challengeable preparation.…”