Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States.
ACS Nano. 2012 Apr 24;6(4):2925-30. doi: 10.1021/nn300949q. Epub 2012 Apr 2.
We demonstrate the one-dimensional confinement of weakly bound butyrophenone molecules between strongly bound complexes formed via reaction with oxygen on TiO(2)(110). Butyrophenone weakly bound to Ti rows through the carbonyl oxygen diffuses freely in one dimension along the rows even at 55 K, persisting for many minutes before hopping out of the 1-D well. Quantitative analysis yields an estimate of the migration barrier of 0.11 eV and a frequency factor of 6.5 × 10(9) Hz. These studies demonstrate that weakly bound organic molecules can be confined on a surface by creating molecular barriers, potentially altering their assembly.
我们展示了弱束缚的丁酰苯分子在通过与 TiO(2)(110)上的氧反应形成的强束缚复合物之间的一维限制。通过羰基氧弱束缚在 Ti 排上的丁酰苯在 55 K 下可以沿排一维自由扩散，在跳出一维势阱之前持续几分钟。定量分析得出迁移势垒的估计值为 0.11 eV，频率因子为 6.5×10(9) Hz。这些研究表明，通过创建分子势垒可以将弱束缚的有机分子限制在表面上，从而可能改变它们的组装方式。
