2.2.2-Cryptand as a bidentate ligand in rare-earth metal chemistry

Abstract

Crystal structures demonstrate that 2.2.2-cryptand can function as a κ2-O,O′ bidentate ligand to rare-earth metal ions.

Oxa‐TriQuinoline: A New Entry to Aza‐Oxa‐Crown Architectures**

“…[2][3][4][5] Reactions driven by the size-specific capture of Group IA and IIA metal cations with crown ethers were soon expanded, spurring decades of advancements in hostguest and supramolecular chemistry harnessing more general non-covalent interactions. The incorporation of multiple oxygen atoms is a key structural feature for designing cation-trapping macrocycles, for example, sophisticated cage-like cryptands, [6][7][8][9][10][11] calix[n]arenes with phenols, [12][13][14][15][16][17][18] Kläui oxygen tripodal ligands, [19][20][21][22] polyorganostannates, [23,24] tris(methoxysilyl)crystallogenides, [25,26] and cyclic peptides, [13,[27][28][29] as well as recently developed polyketones [30][31][32] featuring multiple carbonyl oxygen atoms. In addition to oxygen-based macrocycles, nitrogen counterparts such as porphyrins have emerged in nature that accommodate a variety of transition metals to significantly expand the scope of vital biocatalytic transformations.…”

Oxa-TriQuinoline: A New Entry to Aza-Oxa-Crown Architectures

“…[2][3][4][5] Chemistry driven by the size-specific capture of group-IA and -IIA metal cations with crown ethers was soon expanded, spurring decades of advancements in host-guest and supramolecular chemistry harnessing more general non-covalent interactions. The incorporation of multiple oxygen atoms is a key structural feature for designing cation-trapping macrocycles, e.g., sophisticated cage-like cryptands, [6][7][8][9][10][11] calix[n]arenes with phenols, [12][13][14][15][16][17][18] Kläui oxygen tripodal ligands, [19][20][21][22] polyorganostannates, 23,24 tris(methoxysilyl)crystallogenides, 25,26 and cyclic peptides, 13,[27][28][29] as well as recently developed polyketones [30][31][32] featuring multiple carbonyl oxygen atoms. In addition to oxygen-based macrocycles, nitrogen counterparts such as porphyrins have emerged in nature that accommodate a variety of transition metals to significantly expand the scope of vital biocatalytic transformations.…”

Oxa‐TriQuinoline: A New Entry to Aza‐Oxa‐Crown Architectures**

“…[2][3][4][5] Reactions driven by the size-specific capture of Group IA and IIA metal cations with crown ethers were soon expanded, spurring decades of advancements in hostguest and supramolecular chemistry harnessing more general non-covalent interactions. The incorporation of multiple oxygen atoms is a key structural feature for designing cation-trapping macrocycles, for example, sophisticated cage-like cryptands, [6][7][8][9][10][11] calix[n]arenes with phenols, [12][13][14][15][16][17][18] Kläui oxygen tripodal ligands, [19][20][21][22] polyorganostannates, [23,24] tris(methoxysilyl)crystallogenides, [25,26] and cyclic peptides, [13,[27][28][29] as well as recently developed polyketones [30][31][32] featuring multiple carbonyl oxygen atoms. In addition to oxygen-based macrocycles, nitrogen counterparts such as porphyrins have emerged in nature that accommodate a variety of transition metals to significantly expand the scope of vital biocatalytic transformations.…”