Open AccessHost‐Guest Chemistry of Truncated Tetrahedral Imine Cages with Ammonium Ions
Author(s) -
Lauer Jochen C.,
Pang Ziwei,
Janßen Paul,
Rominger Frank,
Kirschbaum Tobias,
Elstner Marcus,
Mastalerz Michael
Publication year - 2020
Publication title -
chemistryopen
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 29
ISSN - 2191-1363
DOI - 10.1002/open.201900357
Subject(s) - chemistry , imine , host–guest chemistry , ion , tetrahedron , dichloromethane , crystallography , computational chemistry , organic chemistry , solvent , crystal structure , supramolecular chemistry , catalysis
Three shape‐persistent [4+4] imine cages with truncated tetrahedral geometry with different window sizes were studied as hosts for the encapsulation of tetra‐ n ‐alkylammonium salts of various bulkiness. In various solvents the cages behave differently. For instance, in dichloromethane the cage with smallest window size takes up NEt 4 + but not NMe 4 + , which is in contrast to the two cages with larger windows hosting both ions. To find out the reason for this, kinetic experiments were carried out to determine the velocity of uptake but also to deduce the activation barriers for these processes. To support the experimental results, calculations for the guest uptakes have been performed by molecular mechanics’ simulations. Finally, the complexation of pharmaceutical interested compounds, such as acetylcholine, muscarine or denatonium have been determined by NMR experiments.