Molecular capsules formed by three different cucurbit[5]urils and some lanthanide ions

Abstract

Four molecular capsules based on three different cucurbit[5]urils, which are Dimethyl cucurbit[5]uril (DMeQ[5]), decamethylcucurbit[5]uril (Me 10Q[5]) and the normal cucurbit[5]uril, were synthesized and structurally characterized by single-crystal X-ray diffractions. They are {[Gd 2(H 2O) 9][DMeQ[5]@Cl]} 5+·5Cl −·13(H 2O) ( 1), {[Nd 2(H 2O) 8Cl][Me 10Q[5]@Cl]} 4+·4Cl −·9(H 2O) ( 2), {K(H 2O) 2Cl·{[[Dy 2(H 2O) 6Cl][Q [5]@Cl]} 2} 8+·2{[Dy 2(H 2O) 7Cl][Q[5]@Cl]} 4+·16Cl −·44(H 2O) ( 3) and 2{[Y 2(H 2O) 8][Me 10Q[5]@Cl]} 5+·10Cl −·48(H 2O) ( 4). In the crystal structure of these compounds, molecular capsules included a Cl − anion and lidded with lanthanide cations were observed.