Publication Date:
2010-05-15
Description:
Direct studies of how organic molecules diffuse on metal oxide surfaces can provide insights into catalysis and molecular assembly processes. We studied individual catechol molecules, C6H4(OH)2, on a rutile TiO2(110) surface with scanning tunneling microscopy. Surface hydroxyls enhanced the diffusivity of adsorbed catecholates. The capture and release of a proton caused individual molecules to switch between mobile and immobile states within a measurement period of minutes. Density functional theory calculations showed that the transfer of hydrogen from surface hydroxyls to the molecule and its interaction with surface hydroxyls substantially lowered the activation barrier for rotational motion across the surface. Hydrogen bonding can play an essential role in the initial stages of the dynamics of molecular assembly.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Li, Shao-Chun -- Chu, Li-Na -- Gong, Xue-Qing -- Diebold, Ulrike -- New York, N.Y. -- Science. 2010 May 14;328(5980):882-4. doi: 10.1126/science.1188328.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics and Engineering Physics, Tulane University, New Orleans, LA 70118, USA. sli1@tulane.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20466928" target="_blank"〉PubMed〈/a〉
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
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Chemistry and Pharmacology
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Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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