Stereospecific change in conformation upon complexation of an exoditopic tetraamide host with a bis(ammonium) guest:chiral recognition and strong CD signaling

摘要

Upon complexation of a rectangular-shaped achiral macro-cyclic host with chiral guests,twisting deformation occurs to induce exciton-type bisignated CD,whereas a chiral rectangular host undergoes a similar structural change only with the matching enantiomer of a chiral guest.