Epitaxial Templating of C60 with a Molecular Monolayer
Supporting data for manuscript "Epitaxial Templating of C60 with a Molecular Monolayer " DOI: 10.1021/acs.jpclett.6b01656 This data set contains all raw data used in preparation of the manuscript
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Full experimental procedures: Synthesis of Truxenone: 1,3-Indanedione (20.00g, 137 mmol) was added portion-wise to concentrated sulphuric acid (200 ml) under stirring. The reaction mixture was heated to 100°C for 3 hours and subsequently poured onto ice (1L). The crude product was isolated by filtration and washed with copious amounts of water and acetone. The title compound was obtained as a yellow solid (13.81 g, 35.9 mmol, 79% yield) after trituration with dichloromethane. After synthesis, Truxenone was triply purified by thermal gradient sublimation before use in ultra-high vacuum. Experimental conditions: All experiments were carried out at ambient temperature in a custom-built multi-chamber UHV system with a base pressure better than 3x10-10 mbar. Standard low-temperature effusion cells (Karl Eberl) were used at 150°C for Truxenone and 350°C for C60 layers. Low, medium and high coverage of C60 were realised by 5, 10 and 20 minutes of growth respectively. Only the highest coverage (20 minutes growth time) was reproduced on bare Cu (111) and is shown in figure S1. STM images were recorded with an STM/AFM (Omicron) operated in constant current mode using electrochemically etched polycrystalline tungsten tips. LEED patterns were collected with a SPECTALEED (Omicron) rear-view MCP-LEED with nano-amp primary beam current. A single crystal Cu (111) substrate (Surface Preparation Lab, NL cutting accuracy 0.1°) was prepared in vacuum by repeated cycles of argon ion sputtering and annealing (Ar+ energy 1.5keV temperature 550°C).