X-ray crystallography proves that alkali cations can act as conformational template for 1,5-bridged calix[8]arenes, folding their skeleton in a tub- shaped conformation composed by four 3/4-cone clefts. This templation occurs even for neutral 1,5-bridged calix[8]arenes, to give a (1,5- bridgedcalix[8]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 are excluded.
Alkali cation "conformational templation" in 1,5-bridged calix[8]arenes: a single crystal x-ray proof
Cunsolo F;Geraci C;
2002
Abstract
X-ray crystallography proves that alkali cations can act as conformational template for 1,5-bridged calix[8]arenes, folding their skeleton in a tub- shaped conformation composed by four 3/4-cone clefts. This templation occurs even for neutral 1,5-bridged calix[8]arenes, to give a (1,5- bridgedcalix[8]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 are excluded.File in questo prodotto:
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