Most chemically fueled molecular switches suffer from the problem of waste accumulation inhibiting the system. Herein, we present a 180° rotating molecular switch based on reversible (de)hydrogenation avoiding waste accumulation. Catalyzed by an iridium complex, switching from a pressure of argon to a pressure of hydrogen triggers a reversible change in the system from alcohol to ketone, promoting
Designed Molecular Switches: Controlling the Conformation of Benzamido-diphenylacetylenes
作者:Ian M. Jones、Andrew D. Hamilton
DOI:10.1021/ol101397y
日期:2010.8.20
With the goal of creating a molecular switch, the hydrogen-bonded diphenylacetylene structure has been modified such that an equilibrium now exists between two intramolecular H-bonded states. Through X-ray crystallography and H-1 NMR analysis it is shown that this equilibrium can be biased in a predictable manner by modulating the relative acidity of the amide NH's.
pH-Dependent Conformational Switching in 2,6-Benzamidodiphenylacetylenes
作者:Ian M. Jones、Hannah Lingard、Andrew D. Hamilton
DOI:10.1002/anie.201106241
日期:2011.12.23
The conformational equilibrium of a pH-dependent switch based on an intramolecularly H-bonded diphenylacetylene can be predictably biased by using electron-donating or -withdrawing groups. Furthermore, protonation of the electron-donating dimethylamino group converts it into an electron-withdrawing dimethylammonium cation with a concomitant switch in conformation.