Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 15: Solid-Liquid Interfaces 2: Structure and Spectroscopy
O 15.7: Vortrag
Montag, 5. September 2022, 16:45–17:00, S054
Dynamic Polymorph Formation of a Trimesic Acid Derivative at Solid-Liquid Interface — •Richa Arjariya1, Vipin Mishra1, Gagandeep Kaur1, Sandeep Verma1, Markus Lackinger2, and Thiruvancheril G Gopakumar1 — 1Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, UP-208016, India — 2Department of Physics, Technical University of Munich, James-Franck-Strasse 1, Garching 85748 and Deutsches Museum, Museumsinsel 1, Munich 80538, Germany
In this work we show the self-assembly of a tricarboxylic acid derivative of trimesic acid (BTA) at heptanoic acid-, nonanoic acid-graphite interface. At both interfaces BTA forms a trimer based-self-assembly, super-flower (SF) pattern. The spontaneously formed SF pattern is observed to be dynamically converting to a dimer-based assembly, chicken-wire pattern (CW), at heptanoic acid-graphite interface while scanning. Interestingly, at nonanoic acid-graphite interface, SF pattern remains stable and not converted to CW pattern. We attribute that the formation energy of both SF and CW patterns is comparable. The difference in the stability of different patterns in heptanoic acid and nonanoic acid is most likely related to the solubility of BTA in these solvents.[1,2]
1) T. N. Ha, T. G. Gopakumar, M. Hietschold, J. Phys. Chem. C, 2011, 115, 21743.
2) M. Lackinger, S. Griessl, W. M. Heckl, M. Hietschold and G. W. Flynn, Langmuir, 2005, 21, 11, 4984-4988