Langmuir 2004-04-13

Direct STM investigation of cinchona alkaloid adsorption on Cu(III).

Qing-Min Xu, Dong Wang, Mei-Juan Han, Li-Jun Wan, Chun-Li Bai

Index: Langmuir 20(8) , 3006-10, (2004)

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Abstract

Scanning tunneling microscopy (STM) combined with cyclic voltammetry has been employed to investigate the adsorption of cinchonine on Cu(111). Similar to cinchonidine, cinchonine forms a long-range ordered adlayer with (4 x 4) symmetry on the substrate. The structural details on molecular adsorption were obtained by high-resolution STM images. On the basis of the previous results and obtained STM images, the quinoline ring is proposed to lie parallel to Cu(111) and serve as an anchoring group. The chiral quinuclidine moiety extends out of the surface to facilitate the interaction with the prochiral reactants.

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