Light-driven rotary molecular motors on gold nanoparticles.
作者
Pollard, Michael M.;ter Wiel, Matthijs K. J.;van Delden, Richard A.;Vicario, Javier;Koumura, Nagatoshi;van den Brom, Coenraad R.;Meetsma, Ajke;Feringa, Ben L.;
[摘要]：We report the synthesis of unidirectional light-driven rotary mol. motors based on chiral over-crowded alkenes and their immobilization on the surface of gold nanoparticles through two anchors. Using a combination of 1H and 13C NMR, UV/Vis and CD spectroscopy, we show that these motors preserve their photochem. and thermal behavior after they have been attached to gold nanoparticles. Furthermore, we describe the synthesis of 2H- and 13C-labeled derivs. that were used to verify the unidirectionality of the rotary cycle of these motors both in soln. and while grafted to gold nanoparticles. Taken together, these data support the conclusion that these motors maintain their unidirectional rotary cycle when grafted to the surface of small (ca. 2 nm) gold nanoparticles. Thus, continuous irradn. of the system under appropriate conditions leads to unidirectional rotation of the upper half of the mols. relative to the entire nanoparticle.
