Title of article :
Synthesis and complexing properties of 1,5:3,7-doubly bridged calix[8]arenes with mixed spanning elements
Author/Authors :
Gregoli، نويسنده , , Maria Luisa and Russo، نويسنده , , Laura and Stefio، نويسنده , , Ivan and Gaeta، نويسنده , , Carmine and Arnaud-Neu، نويسنده , , Françoise and Hubscher-Bruder، نويسنده , , Véronique and Khazaeli-Parsa، نويسنده , , Poupak and Geraci، نويسنده , , Corrada and Neri، نويسنده , , Placido، نويسنده ,
Abstract :
Two different bridges were introduced at the 1,5:3,7-positions of p-tert-butylcalix[8]arene 1 using a two-step alkylation procedure. A probable cation template effect in the introduction of the second bridge was evidenced. The obtained bis-bridged derivatives 3 possess encapsulating properties toward alkali cations modulated by the length and nature of the bridges.
Keywords :
Calixarenes , intramolecular bridging , association constants , Ionophores
