Direct STM investigation of cinchona alkaloid adsorption on Cu(III).
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.
Xu
Qing-Min
QM
Wang
Dong
D
Han
Mei-Juan
MJ
Wan
Li-Jun
LJ
Bai
Chun-Li
CL
D000327:Adsorption; D002384:Catalysis; D002930:Cinchona Alkaloids / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D004566:Electrodes; D016252:Microscopy, Scanning Tunneling; D015394:Molecular Structure; D013237:Stereoisomerism
D002930:Cinchona Alkaloids; C041622:cinchonidine; D003300:Copper; C010086:cinchonine