Construction of Discrete Pentanuclear Platinum(II) Stacks with Extended Metal–Metal Interactions by Using Phosphorescent Platinum(II) Tweezers

Abstract

Abstract Discrete pentanuclear Pt II stacks were prepared by the host‐guest adduct formation between multinuclear tweezer‐type Pt II complexes. The formation of the Pt II stacks in solution was accompanied by color changes and the turning on of near‐infrared emission resulting from Pt⋅⋅⋅Pt and π–π interactions. The X‐ray crystal structure revealed the formation of a discrete 1:1 adduct, in which a linear stack of five Pt II centers with extended Pt⋅⋅⋅Pt interactions was observed. Additional binding affinity and stability have been achieved through a multinuclear host‐guest system. The binding behaviors can be fine‐tuned by varying the spacer between the two Pt II moieties in the guests. This work provides important insights for the construction of discrete higher‐order supramolecular metal‐ligand aggregates using a tweezer‐directed approach.