Formation of [3]Catenanes from 10 Precursors via Multicomponent Coordination-Driven Self-Assembly of Metallarectangles

We describe the formation of a suite of [3]­catenanes
via multicomponent
coordination-driven self-assembly and host–guest complexation
of a rectangular scaffold comprising a 90° Pt-based acceptor
building block with a pseudorotaxane bis­(pyridinium)­ethane/dibenzo-24-crown-8
linear dipyridyl ligand and three dicarboxylate donors. The doubly
threaded [3]­catenanes are formed from a total of 10 molecular components
from four unique species. Furthermore, the dynamic catenation process
is reversible and can be switched off and on in a controllable manner
by successive addition of KPF6 and 18-crown-6, as monitored
by 1H and 31P NMR spectroscopy.