Orientational Growth of Flexible van der Waals Supramolecular Networks

The capacity for nanopatterning and functionality is a promising facet of supramolecular self-assembly. However, the formation of molecular frameworks entirely dependent on van der Waals (vdW) interactions is infrequently explored. Herein, 2D vdW supramolecular structures are synthesized through the self-assembled cocrystallization of C60 and decanethiol (DT) molecules on Au(111) surface. Notably, the system eliminates the need of functional groups for specific bonding between adjacent units. The conformation C60/DT is delicately manipulated by adjusting molecular coverage and annealing temperature. The absence of directional bonding between C60 and DT molecules facilitates the formation of a variety of stable phases at room temperature (RT), such as 1) porous C60 networks with thiol-filled pores and 2) self-synthesized (C60)n nanochains with thiol spacers interspersed between the chains are achieved and visualized by scanning tunneling microscopic imaging under RT. This innovative integration of the vdW interaction unveils new avenues for developing supramolecular patterns characterized by their comparatively weak but exceptionally adaptable bonding. A bicomponent coassembled 2D structure on Au(111) controlled by collective van der Waals (vdW) interactions is explored by scanning tunneling microscopy. The 2D vdW supramolecular structures are synthesized through the self-assembled cocrystallization of C60 and decanethiol molecules on Au(111) surface at room temperature.image (c) 2023 WILEY-VCH GmbH