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SELF ASSEMBLY OF MOLECULES ON SURFACES

TMA


Molecular self-assembly utilizes non-covalent interactions such as hydrogen bonds to yield supramolecular aggregates with defined structure. Surface supported 2D self-assembly of trimesic acid (TMA - 1,3,5-tricarboxybenzene) on graphite results in well ordered, crystalline nanoporous networks:

STM Image of TMA on graphite

Picture 1: STM image (acquired in UHV)  and  corresponding model

Further Reading:


Self-Assembled Two-Dimensional Molecular Host-Guest Architectures From Trimesic Acid

Stefan Griessl, Markus Lackinger, Michael Edelwirth, Michael Hietschold, and Wolfgang M. Heckl, Single Mol., 2002, 3(1), 25-31.


Self-assembly of trimesic acid at the liquid-solid interface – a study of solvent induced polymorphism

Markus Lackinger, Stefan Griessl, Wolfgang M. Heckl, Michael Hietschold, and George W. Flynn, Langmuir, 2005, 21, 4984-4988.

Coronene and Buckyballs


These nanoporous TMA networks can be used as host-system for controlled co-adsorption of size and geometry matched molecular guests:

Picture 2: Coronene (left) and C60 (right) as molecular guests in the TMA network


Further Reading:


Incorporation and Manipulation of Coronene in an Organic Template Structure

Stefan Griessl, Markus Lackinger, Ferdinand Jamitzky, Thomas Markert, Michael Hietschold, and Wolfgang M. Heckl, Langmuir, 2004, 20, 9403-9407.


Room Temperature STM Manipulation of Single C60 Molecules at the Liquid Solid Interface - Playing Nano-Soccer

Stefan Griessl, Markus Lackinger, Ferdinand Jamitzky, Thomas Markert, Michael Hietschold, and Wolfgang M. Heckl, J. Phys. Chem. B, 2004, 108, 11556-11560.

Tayloring of the molecular structure


Tailoring the molecular structure by introducing additional spacer units between the central phenyl ring and the peripheral carboxylic groups, results in enlarged lattice parameters and pore size respectively:

Picture 3: Tayloring of the molecular structure


Further Reading:


Solvent Induced Polymorphism in Supramolecular 1,3,5-Benzenetribenzoic Acid Monolayers

Lorenz Kampschulte, Markus Lackinger, Anne-Kathrin Maier, Ravuri S. K. Kishore, Stefan Griessl, Michael Schmittel, and Wolfgang M. Heckl, J. Phys. Chem. B, 2006, 110, 10829-10836.


Aromatic interaction vs. hydrogen bonding in self-assembly at the liquid–solid interface

Rico Gutzler, Sophie Lappe, Kingsuk Mahata, Michael Schmittel, Wolfgang M. Heckl and Markus Lackinger, Chem. Commun., 2009, 680–682.

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