Toward metal complexes that can directionally walk along tracks: controlled stepping of a molecular biped with a palladium(II) foot.
J Am Chem Soc
; 136(5): 2094-100, 2014 Feb 05.
Article
in En
| MEDLINE
| ID: mdl-24446768
ABSTRACT
We report on the design, synthesis, and operation of a bimetallic molecular biped on a three-foothold track. The "walker" features a palladium(II) complex "foot" 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-ligand 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-track interactions offers a promising alternative to dynamic covalent chemistry for the design of small-molecule synthetic molecular walkers.
Full text:
1
Database:
MEDLINE
Main subject:
Palladium
/
Platinum
/
Pyridines
/
Coordination Complexes
Language:
En
Journal:
J Am Chem Soc
Year:
2014
Type:
Article
Affiliation country:
United kingdom