Recognition of Lanthanide Metal Cations by t-DSMI@Alkyl-Substituted Cucurbit[6]uril Probes

摘要

The binding behavior of three different methyl-substituted cucurbit[6]urils(SQ[6]s),namely hexamethylcucurbit[3,3]uril(Me6Q[3,3]),tri-hydroxylated symmetrical hexamethylcucurbit [3,3]uril((OH)3Me6Q[3,3]),and symmetrical tetramethylcucurbit [6]uril(TMeQ[6])with trans-4-[4-(dimethylamino)styryl]-1-methylpyridinium iodide(t-DSMI)have been investigated.The results showed that the guest t-DSMI exhibits dramatic fluorescence enhancement upon interacting with the three SQ [6]s to form 1:1 inclusion complexes.Upon addition of lanthanide metal cations to the three t-DSMI@SQ[6] probes,the fluorescence of the guest was quenched to varying degrees.On this basis,it is possible to discriminate lanthanide metal cations with different ionic radii by principal component analysis(PCA).