Host-Guest Encapsulation to Promote the Formation of a Multicomponent Trigonal-Prismatic Metallacage.

An inclusion complex of a trigonal-prismatic metallacage with two coronene guests was constructed by multicomponent coordination-driven self-assembly from a 90° platinum(II) acceptor [ cis -Pt(PEt 3 ) 2 (OTf) 2 ], disodium terephthalate, and 2,4,6-tri(4-pyridyl)-1,3,5-triazine in the presence of excess coronene. This platinum(II)-based trigonal prism was found to be a highly matched host to simultaneously encapsulate two coronene molecules. The encapsulation of coronene can effectively promote the formation of a pure single-prismatic metallacage and can stabilize the self-assembled structure via strong π-π-stacking interactions between coronene and the metallacage.