作者:Jos C. M. Kistemaker、Peter Štacko、Diederik Roke、Alexander T. Wolters、G. Henrieke Heideman、Mu-Chieh Chang、Pieter van der Meulen、Johan Visser、Edwin Otten、Ben L. Feringa
DOI:10.1021/jacs.7b04412
日期:2017.7.19
design of two motors which show opposite rotation with respect to a methyl substituent. A third-generation molecularmotor with the potential to be the fastest based on overcrowded alkenes to date was used to visualize the equal rate of rotation of both its rotor units. The autonomous rotational behavior perfectly followed the predicted model, setting the stage for more advanced motors for functional
Fine Tuning of the Rotary Motion by Structural Modification in Light-Driven Unidirectional Molecular Motors
作者:Javier Vicario、Martin Walko、Auke Meetsma、Ben L. Feringa
DOI:10.1021/ja058303m
日期:2006.4.1
The introduction of bulky substituents at the stereogeniccenter of light-driven second-generation molecular motors results in an acceleration of the speed of rotation. This is due to a more strained structure with elongated C=C bonds and a higher energy level of the ground state relative to the transition state for the rate-limiting thermal isomerization step. Understanding the profound influence
Tuning the Rotation Rate of Light-Driven Molecular Motors
作者:Jurica Bauer、Lili Hou、Jos C. M. Kistemaker、Ben L. Feringa
DOI:10.1021/jo500411z
日期:2014.5.16
promising artificial molecular motors because of their ability to undergo repetitive light-drivenunidirectional rotary motion around the central C═C bond. The exceptional features of these molecules render them highly useful for a number of applications in nanotechnology. Many of these applications, however, would benefit from higher rotation rates. To this end, a new molecular motor was designed,
Fluorine-Substituted Molecular Motors with a Quaternary Stereogenic Center
作者:Peter Štacko、Jos C. M. Kistemaker、Ben L. Feringa
DOI:10.1002/chem.201700581
日期:2017.5.11
A series of unprecedented second generation molecular motors featuring a quaternary stereogeniccenter substituted with a fluorine atom has been synthesized. It is demonstrated that a seemingly benign replacement of the stereogenic hydrogen for a fluorine atom, regarded as a common substituent in pharmacology, resulted in a dramatic change in the energetic profile of thermal helix inversion. The barrier
Asymmetric Synthesis of Second-Generation Light-Driven Molecular Motors
作者:Thomas van Leeuwen、Wojciech Danowski、Edwin Otten、Sander J. Wezenberg、Ben L. Feringa
DOI:10.1021/acs.joc.7b00852
日期:2017.5.19
enantiomeric homogeneity of light-driven molecular motors based on overcrowded alkenes is crucial in their application as either unidirectional rotors or as chiral multistate switches. It was challenging to obtain these compounds as single enantiomers via the established synthetic procedures due to loss of optical purity in the key step, i.e., the Barton-Kellogg olefination reaction. Searching for strategies