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Selective Reactions and Adsorption Geometries of a Multifunctional Molecule: cis-2-Butene-1,4-diol on Si(100)-2 Ã 1.
- Source :
-
Langmuir . Jan2010, Vol. 26 Issue 2, p1019-1023. 5p. - Publication Year :
- 2010
-
Abstract
- The adsorption geometry of cis-2-butene-1,4-diol (BEDO, HOCH2CHî»CHCH2OH) on Si(100)-2à 1 was studied using scanning tunneling microscopy (STM), high resolution X-ray photoemission spectroscopy (XPS), and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy. Bias-voltage-dependent STM images exhibited features characteristic of two distinct BEDO adsorption geometries. One feature was a bright protrusion located on the center of a single dimer, indicating an on-top configuration. The low bias-voltage STM image clearly showed dark features indicative of the formation of SiâH bonds on adjacent dimers in the same dimer row. The other feature was a bright protrusion bridged on end between two adjacent dimers in the same dimer row, indicating an end-bridge configuration. Accompanying this feature, two dark features attributed to SiâH bonds were observed on opposite positions to the bridged protrusion. From the XPS results, the Si 2pcore level spectra revealed that the dimer atoms are involved in the formation of SiâO and SiâH bonds. On the other hand, carbon K-edge NEXAFS spectra showed that the Cî»C bond does not participate in the adsorption reaction and remains as an unreacted group. Collectively, the experimental results indicate that the adsorption of BEDO on Si(100)-2à 1 occurs through the formation of two SiâO bonds via nucleophilic reaction between the two OH groups of BEDO and two SiâSi dimers. Importantly, the maintenance of the Cî»C bond means that the Cî»C functional group can be utilized as a new reaction site for further surface chemical reactions. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 07437463
- Volume :
- 26
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Langmuir
- Publication Type :
- Academic Journal
- Accession number :
- 47752221
- Full Text :
- https://doi.org/10.1021/la902570y