6,7,9,10,17,18,20,21,28,29,31,32,39,40,42,43-Hexadecahydro-16,44:22,38-di(ethanooxyethano)-5,8,11,19,27,30,33,41-octaoxa-16,22,38,44-tetraazatetrabenzo[h,q,z,i ₁]cyclohexatriacontine: a benzoannelated tricyclic cryptand

Abstract

Key indicatorsSingle-crystal X-ray study T = 120 K Mean (C-C) = 0.002 Å R factor = 0.043 wR factor = 0.127 Data-to-parameter ratio = 15.5For details of how these key indicators were automatically derived from the article, see

A Structure-Adaptive Ligand: The Conformation Changes to Fit with the Lengths and Angles of Tetravalent Bis-Paraquat Guests

“…Cryptands are macrocyclic molecules with two or more cyclic structures and have donor atoms such as O, N, and S in each linker. Their selectivity and binding ability toward metal cations are higher than those of the corresponding crown ethers with the same membered ring. , Recently, many tricyclic cryptands with a flexible linker have been reported, and crown ether parts of those cryptands were 18- or 21-membered rings. − These tricyclic cryptands cannot form inclusion complexes with organic cationic guests like paraquat derivatives. However, almost all of them show specific complexing ability toward the cationic guests. , It is known that paraquat dications and dibenzyl ammonium salts form stable complexes with cryptands with eight or more ether oxygen atoms in the crown ether moieties.…”