Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 99: Organic Molecules on Inorganic Substrates VI: Adsorption, Growth and Networks
O 99.1: Talk
Thursday, March 19, 2020, 10:30–10:45, GER 38
Electric Field/ Light-Induced Switching of Spiropyran Derivative on Graphite — •HIMANI MALIK1, THOMAS HALBRITTER2, ALEXANDER HECKEL2, and THIRUVANCHERIL G. GOPAKUMAR1 — 1Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016, India — 2Institute for organic chemistry and chemical biology, Goethe-University Frankfurt, Germany
Spiropyran (SP) and its derivatives are known for their switching ability by UV light. SP (closed form), shows reversible ring openings by cleavage of C-O bond and converted into merocyanine (MC, open form). The open form is planar, conjugated and possesses a large dipole moment due to the stabilization of a zwitterion form [1]. The closed and the open forms are distinguished on Au(111) surface as reported before [2]. In the current work, we discuss the self-assembly of SP derivative with a carboxylic group attached to the indoline ring. The carboxylic group offers strong hydrogen bonding interaction, which facilitates the formation of ordered patterns. We show the electrical field and light-induced switching of an adlayer of SP derivative. The SP films are prepared from the solution phase on highly oriented pyrolytic graphite. The microscopic structure and electronic properties are measured using scanning tunnelling microscopy and atomic force microscopy.
1.G. Cottone, et al., Chem. Phys. Lett 2004, 388, 218-222 2.C. Bronner, et al., J. Phys.: Conden. Matter 2011, 23, 484005-12