Add time:08/05/2019         Source:sciencedirect.com

The adsorption of the helically shaped polyaromatic hydrocarbon Heptahelicene (cas 16914-68-4) (C30H18) on Ni(1 1 1) was studied by means of STM, TPD, LEED, ToF–SIMS, XPS, and AES at temperatures between 130 and 1000 K. The molecule in the monolayer remains intact up to 500 K. Above that temperature a stepwise decomposition into carbon and hydrogen occurs; the latter desorbing subsequently as H2. At submonolayer coverages the molecules are adsorbed randomly. The saturated monolayer shows long-range order, but no differences between the structures generated by a pure enantiomer or the racemic mixture have been observed.

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