The role of the solvation shell decomposition of alkali metal ions in their selective complexation by resorcinarene and its cavitand
- Resource Type
- Authors
- Sándor Kunsági-Máté; Erzsébet Szász; Yin Li; Zsolt Csók; Koichi Iwata; László Kollár
- Source
- Supramolecular Chemistry. 24:374-378
- Subject
- chemistry.chemical_compound
Crystallography
Solvation shell
chemistry
Inorganic chemistry
Molecule
Cavitand
Qualitative inorganic analysis
General Chemistry
Resorcinarene
Alkali metal
Derivative (chemistry)
Ion
- Language
- ISSN
- 1029-0478
1061-0278
2-Methylresorcinarene and its methylene-bridged cavitand derivative as host compounds were investigated in selective complexation of alkali metal ions as guests in methanol media by photoluminescence measurements. These host molecules possess either flexible (2-methylresorcinarene) or rigid (cavitand) molecular skeleton. The Benesi–Hildebrand method and the van't Hoff theory have been applied to determine the stability constants and the thermodynamic parameters, respectively. Considerable interactions between 2-methylresorcinarene and Li+ or Na+ ions have been observed while the rigid cavitand derivative can interact only with K+ or Cs+ ions. Neither the complexes of 2-methylresorcinarene with K+ or Cs+ nor those of the cavitand derivative with Li+ or Na+ ions are stable at room temperature in methanol media. Quantum-chemical investigations justified that only solvated Li+ and Na+ ions can form stable complexes with 2-methylresorcinarene while unsolvated K+ and Cs+ ions form stable complexes with the meth...