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Ion‐Pair Complexation with Dibenzo[21]Crown‐7 and Dibenzo[24]Crown‐8 bis‐Urea Receptors
Author(s) -
Mäkelä Toni,
Kiesilä Anniina,
Kalenius Elina,
Rissanen Kari
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201602362
Subject(s) - chemistry , rubidium , halide , crystallography , caesium , selectivity , crown ether , crystal structure , 18 crown 6 , affinities , ion , inorganic chemistry , stereochemistry , potassium , organic chemistry , catalysis
Synthesis and ion‐pair complexation properties of novel ditopic bis‐urea receptors based on dibenzo[21]crown‐7 ( R 1 ) and dibenzo[24]crown‐8 ( R 2 ) scaffolds have been studied in the solid state, solution, and gas phase. In a 4:1 CDCl 3 /[D 6 ]DMSO solution, both receptors clearly show positive heterotropic cooperativity toward halide anions when complexed with Rb + or Cs + , with the halide affinity increasing in order I −