Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom.
J Chem Phys. 2012 Aug 21;137(7):074703. doi: 10.1063/1.4743901.
Exposing a Au{111} surface to NO(2) and then to CO at temperatures around 120 K in ultra-high vacuum gives rise to molecular overlayers in which the two species are co-adsorbed, which we have investigated using low-temperature scanning tunnelling microscopy. Under NO(2)-rich conditions, a (√7 × √7)R19.1° phase with 3:1 NO(2):CO stoichiometry forms. Under CO-rich conditions, this phase co-exists with other phases having 2:1 and 1:1 NO(2):CO stoichiometries and different symmetries, and with bare Au surface. Structural models for these phases are discussed. Individual domains of the (√7 × √7)R19.1° phase are chiral, by virtue of the arrangement of their achiral components, an observation that may have more general implications.
在超高真空条件下，将 Au{111}表面暴露于 NO(2)和 CO 中，温度约为 120 K，会导致两种物质共吸附的分子覆盖层，我们使用低温扫描隧道显微镜对其进行了研究。在富含 NO(2)的条件下，形成了具有 3:1 NO(2):CO 化学计量比的(√7 × √7)R19.1°相。在 CO 丰富的条件下，该相与具有 2:1 和 1:1 NO(2):CO 化学计量比和不同对称性的其他相以及裸露的 Au 表面共存。讨论了这些相的结构模型。(√7 × √7)R19.1°相的各个畴是手性的，这是由于其非手性成分的排列，这一观察结果可能具有更普遍的意义。
