Alkali cation ‘conformational templation’ in 1,5-bridged calix[8]arenes: a single crystal X-ray proof

✍ Scribed by Grazia M.L. Consoli; Francesca Cunsolo; Corrada Geraci; Enrico Gavuzzo; Placido Neri

• Book ID: 104232404
• Publisher: Elsevier Science
• Year: 2002
• Tongue: French
• Weight: 136 KB
• Volume: 43
• Category: Article
• ISSN: 0040-4039
• DOI: 10.1016/s0040-4039(01)02364-4

✦ Synopsis

X-Ray crystallography proves that alkali cations can act as conformational templates for 1,5-bridged calix[8]arenes 1H 6 -3H 6 , folding their skeleton in a 'tub-shaped' conformation composed of four 3/4-cone clefts. This templation occurs even for neutral 1H 6 to give a (1H 6 Cs) + •Cl -complex, where Cs + was found perfectly fitting inside the eight calix[8]arene oxygens cavity. Conventional 'electrostatic' coordination with O atoms occurs whereas cation-p interactions can be excluded.