Open AccessESI-MS detection of very weak π-Stacking interactions in the mixed-ligand sandwich complexes formed by substituted benzo-crown ethers and metal cations
Author(s) -
Rafał Frański,
Błażej Gierczyk
Publication year - 2010
Publication title -
journal of the american society for mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.961
H-Index - 127
eISSN - 1879-1123
pISSN - 1044-0305
DOI - 10.1016/j.jasms.2009.12.018
Subject(s) - chemistry , stacking , ligand (biochemistry) , metal , 15 crown 5 , crystallography , stereochemistry , crown ether , ion , organic chemistry , receptor , biochemistry
The stability of the mixed-ligand complex formed by amino-benzo-15-crown-5 and nitro-benzo-15-crown-5, with a metal cation, [NH(2)B15C5 + NO(2)B15C5 + K](+), was found to be enhanced by pi-stacking interactions. This conclusion was deduced by comparison of the abundance of the mixed-ligand complex with the abundances of homo-ligand complexes ([(NH(2)B15C5)(2) + K](+), [(NO(2)B15C5)(2) + K](+)), as well as with those of 1:1 complexes ([NH(2)B15C5 + K](+), [NO(2)B15C5 + K](+)). Some solvents and some metal cations with large radii were also found to prevent the existence of pi-stacking interactions.