jp9b11867_si_001.pdf (3.74 MB)
Solution-Mediated Annealing Pathways Are Critical for Supramolecular Ordering of Complex Macrocycles at Surfaces
journal contribution
posted on 2020-03-12, 12:34 authored by Henry
D. Castillo, Jing Yang, Sibali Debnath, James R. Dobscha, Colleen Q. Trainor, Riley D. Mortensen, Krishnan Raghavachari, Amar H. Flood, Peter J. Ortoleva, Steven L. TaitSelf-organizations
of supramolecular assemblies at surfaces typically
achieve highly ordered two-dimensional packing structures due to the
negotiation of various intermolecular interactions into a minimum
free energy configuration. As we advance these systems toward the
long-term goal of achieving programmable surface functionality, however,
we consider systems of greater complexity in molecular building-block
architecture and in growth conditions. Here, we study the polymorphic
self-assembly of tricarbazolo triazolophane macrocycles (tricarb)
at the solution/solid interface to determine the underlying pathway
that tricarb follows when it transitions between two structures. Tricarb
species, depending on peripheral functionalization, self-assemble
into kinetically trapped disordered structures or thermodynamically
favored ordered honeycomb structures. Experiments varying pre- and
post-deposition conditions (solubility, concentration, and temperature)
suggest that a solution-mediated annealing pathway, as opposed to
an on-surface rearrangement, is key to a transition from disordered
structures to honeycomb. Molecular dynamic simulations provide nanoscale
insights into the roles of peripheral groups and solvent molecules
in self-assembly. Substituents on the exterior of the molecule not
only affect solubility but also stabilize tricarb–tricarb hydrogen-bonded
structures. Peripheral groups influence the formation/re-formation
and strength of adsorbate–adsorbate contacts and also limit
solvent interactions about a macrocyclic core. The combination of
simulation and experiment demonstrates the role of the solution-mediated
annealing pathway in the self-assembly of complex supramolecular systems.
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surface functionalitygrowth conditionssupramolecular assembliesSurfaces Self-organizationssolution-mediated annealing pathwayhoneycomb structuresnanoscale insightsSupramolecular Orderingmacrocyclic corepost-deposition conditionsbuilding-block architectureon-surface rearrangementsupramolecular systemspolymorphic self-assemblyTricarb speciesComplex MacrocyclesPeripheral groups influencetricarbazolo triazolophane macrocyclesSolution-Mediated Annealing Pathwaysenergy configuration
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