Ion-Pair Complexation with Dibenzo[21]Crown-7 and Dibenzo[24]Crown-8 bis-Urea Receptors.

: 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 CDCl3 /[D6 ]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(-)

Keywords:

• Inorganic chemistry
• Organic chemistry
• Urea
• Supramolecular chemistry
• Crown Compounds
• Hydrogen bond
• Chemistry
• Ion
• Receptor
• Cooperativity
• Halide
• Rubidium
• Crystal structure
• Caesium
• Selectivity

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