Supramolecular Recognition Forces:An Examination of Weak Metal-Metal Interactions in Host-Guest Formation

摘要

Molecular receptors consisting of two parallel-disposed terpy-M-Cl units (M = Pd~(2+),Pt~(2+)) are used to form host-guest adducts with aromatic molecules and with neutral square-planar Pt~(2+) complexes.Host-guest formation is controlled by several factors including pi-pi interactions and,in some cases,weak Pt-Pt interactions between the host and the guest.This latter interaction was examined by comparing the host-guest stability of adducts formed by isoelectronic Pt~(2+) and Au~(3+) complexes with the Pt~(2+) receptor.Consistently,the former is more stable.