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News from an Old Ligand: The Triple‐Decker Ion Triple, Tris([18]Crown‐6)‐disodium Bis(tetraphenycyclopentadienide)
Author(s) -
Bock Hans,
Hauck Tim,
Näther Christian,
Havlas Zdenek
Publication year - 1997
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.199706381
Subject(s) - dication , ion , ligand (biochemistry) , chemistry , ring (chemistry) , crystallography , triple bond , crown (dentistry) , tris , sodium , stereochemistry , materials science , polymer chemistry , double bond , organic chemistry , receptor , biochemistry , composite material
Three [18]crown‐6 ligands and two sodium ions surprisingly form a triple‐decker sandwich dication, pictured schematically on the right. Due to sixfold O‐coordination of each sodium ion to the outer crown ethers, but only two Na + ċ O contacts each to the central ligand, the outer macrocyclic rings are distorted to a hemispherical conformation, whereas the central ring adopts a rectangular shape.