Two-Dimensional Cysteine and Cystine Cluster Networks on Au(111) Disclosed by Voltammetry and in Situ Scanning Tunneling Microscopy
Microscopic structures for molecular monolayers of L-cysteine and L-cystine assembled on Au(111) have been disclosed by employing electrochemistry and in situ scanning tunneling microscopy (STM). High-resolution STM images show that the adlayers of both cyteine and cystine exhibit highly-ordered net...
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Published in | Langmuir Vol. 16; no. 18; pp. 7229 - 7237 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
American Chemical Society
05.09.2000
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Online Access | Get full text |
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Summary: | Microscopic structures for molecular monolayers of L-cysteine and L-cystine assembled on Au(111) have been disclosed by employing electrochemistry and in situ scanning tunneling microscopy (STM). High-resolution STM images show that the adlayers of both cyteine and cystine exhibit highly-ordered networklike clusters with (3√3 × 6)R30° structure. By combining the surface coverage estimated from voltammetric data, each cluster is demonstrated to include six individual cysteine molecules or three cystine molecules. As a comparison, no cluster structure is observed for the 1-butanethiol adlayer prepared and examined under the same conditions as those for cysteine and cystine. This suggests that intermolecular and intramolecular hydrogen bonds among adsorbed cysteine or cystine molecules could be responsible for the origin of the cluster−network structures for the adlayers. Several models are proposed and used to explain the in situ STM observations in detail. |
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Bibliography: | istex:D28767235D1E11B61E9CA7271E97A09E6B7371B5 ark:/67375/TPS-BRH5MVDN-7 |
ISSN: | 0743-7463 1520-5827 |
DOI: | 10.1021/la000246h |