A Terthiophene-Containing Alkynylplatinum Terpyridine Pacman Complex: Controllable Folding/Unfolding Modulated by Weak Intermolecular Interactions

Folded and unfolded solid-state structures of a bimetallic alkynylplatinum terpyridine complex with a flexible terthiophene linker have been obtained. Weak intermolecular interactions including pi-pi stacking and C-H center dot center dot center dot O and C-H center dot center dot Cl interactions as well as Cl-pi interactions stabilize the folded structure. In solution, folding is studied by electronic absorption spectroscopy and H-1 and NOESY NMR experiments.