Macrobicyclic Polyethers as Second Sphere Ligands for Tetraammineplatinum(<scp>II</scp>)

Abstract

A T-arrangement of two benzene rings contributes—aside from H-bridges—to the stabilization of a 2:1 adduct of the molecular receptor 2 with [Pt(NH3)4]2⊕ in the solid state (X-ray structure analysis); in [D6]acetone only a 1:1 adduct is present (1H-NMR). With the same cation, 1 forms only 1:1 adducts in solution and in the solid state. Thus, small changes in the ligands can drastically alter its bonding properties (1, R  H; 2, R  Me).