Toward Metal Complexes That Can Directionally Walk Along Tracks: Controlled Stepping of a Molecular Biped with a Palladium(II) Foot
详细信息 查看全文
- 作者：Jonathon E. Beves ; Victor Blanco ; Barry A. Blight ; Romen Carrillo ; Daniel M. D’Souza ; David Howgego ; David A. Leigh ; Alexandra M. Z. Slawin ; Mark D. Symes
- 刊名：Journal of the American Chemical Society
- 出版年：2014
- 出版时间：February 5, 2014
- 年：2014
- 卷：136
- 期：5
- 页码：2094-2100
- 全文大小：447K
- ISSN：1520-5126
文摘
We report on the design, synthesis, and operation of a bimetallic molecular biped on a three-foothold track. The 鈥渨alker鈥?features a palladium(II) complex 鈥渇oot鈥?that can be selectively stepped between 4-dimethylaminopyridine and pyridine ligand sites on the track via reversible protonation while the walker remains attached to the track throughout by means of a kinetically inert platinum(II) complex foot. The substitution pattern of the three ligand binding sites, together with the kinetic stability of the metal鈥搇igand coordination bonds, affords the two positional isomers a high degree of metastability, meaning that altering the chemical state of the track does not automatically instigate stepping in the absence of an additional stimulus (heat in the presence of a coordinating solvent). The use of metastable metal complexes for foot鈥搕rack interactions offers a promising alternative to dynamic covalent chemistry for the design of small-molecule synthetic molecular walkers.