Regensburg 2019 – scientific programme
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O: Fachverband Oberflächenphysik
O 15: Metal Substrates II: Adsorption and Reactivity
O 15.10: Talk
Monday, April 1, 2019, 17:15–17:30, Kunsthalle
Solvent Induced Growth Polymorphs of 1,3-Dithia Derivatives of Ferrocene on HOPG — •Thiruvancheril G. Gopakumar1, Prithwidip Saha1, Vinithra Gurunarayanan1, Vladimir V. Korolkov2, Prema G. Vasudev3, Ramesh Ramapanicker1, and Peter H. Beton2 — 1Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India — 2School of Physics and Astronomy, The University of Nottingham, Nottingham NG7 2RD, United Kingdom — 3Molecular and Structural Biology Department, CSIR-Central Institute of Medicinal & Aromatic Plants, Lucknow UP-226015, India
Ferrocene (Fc) and its derivatives have attracted interest in electronic applications[1] due to its tunable of electronic properties. In this work we have studies the microscopic structure of ultra-thin films of two 1,3-dithia derivatives of Ferrocene (Fcs) on the basal plane of highly oriented pyrolytic graphite (HOPG) using AFM and STM at ambient conditions. Films are prepared by drop-casting Fcs dissolved in different solvents. Upon deposition of Fcs from methanol and DCM, two types of molecular growth polymorphs are observed. When Fcs are deposited from ethanol, acetone, DMF and toluene, one of the growth polymorphs is exclusively observed. The formation of growth polymorphs are understood using the boiling point of solvents and the solubility of Fcs in solvents.[2] Solvents with high boiling point prompts the formation of energetically favorable growth.
[1] N.Nerngchamnong et al. Nat. Nanotechnol. 2013, 8, 113. [2] P. Saha et al. J. Phys. Chem. C, 2018, 122, 19067.