A Tripodal [2]Rotaxane on the Surface of Gold
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- 作者：Kirill Nikitin ; Elena Lestini ; Mariachiara Lazzari ; Silvano Altobello ; Donald Fitzmaurice
- 刊名：Langmuir
- 出版年：2007
- 出版时间：November 20, 2007
- 年：2007
- 卷：23
- 期：24
- 页码：12147 - 12153
- 全文大小：155K
- 年卷期：v.23,no.24(November 20, 2007)
- ISSN：1520-5827
文摘
Tripodal [2]rotaxane, 3, and the structurally related axle, 2, incorporating a viologen moiety, a crown ether, andthree thiol anchoring groups have been synthesized. Analogous monopodal derivatives, 1, have also been prepared.Self-assembled monolayers of the above tripodal and monopodal systems on gold have been studied by cyclic voltammetry.It has been shown that a thiol anchoring group is required to attach the monopodal viologen 1 to the surface of goldand that the maximum surface coverage of 1 corresponds to 2.7 × 10-10 mol·cm-2. The adsorbed monopodal viologen1 does not thread bis-p-phenylene-34-crown-10 ether, 6. However, the tripodal axle 2 adsorbed on the surface of goldthreads the crown ether 6 to form a hetero [2]rotaxane. In the case of the tripodal axle 2, the surface coverage is 7× 10-11 mol·cm-2, while for the tripodal [2]rotaxane 3 the surface coverage reaches 1.1 × 10-10 mol·cm-2.