Dissipative Catalysis with a Molecular Machine
We report on catalysis by a fuel‐induced transient state of a synthetic molecular machine. A [2]rotaxane molecular shuttle containing secondary ammonium/amine and thiourea stations is converted between catalytically inactive and active states by pulses of a chemical fuel (trichloroacetic acid), whic...
Saved in:
Published in | Angewandte Chemie International Edition Vol. 58; no. 29; pp. 9876 - 9880 |
---|---|
Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
WEINHEIM
Wiley
15.07.2019
Wiley Subscription Services, Inc John Wiley and Sons Inc |
Edition | International ed. in English |
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | We report on catalysis by a fuel‐induced transient state of a synthetic molecular machine. A [2]rotaxane molecular shuttle containing secondary ammonium/amine and thiourea stations is converted between catalytically inactive and active states by pulses of a chemical fuel (trichloroacetic acid), which is itself decomposed by the machine and/or the presence of additional base. The ON‐state of the rotaxane catalyzes the reduction of a nitrostyrene by transfer hydrogenation. By varying the amount of fuel added, the lifetime of the rotaxane ON‐state can be regulated and temporal control of catalysis achieved. The system can be pulsed with chemical fuel several times in succession, with each pulse activating catalysis for a time period determined by the amount of fuel added. Dissipative catalysis by synthetic molecular machines has implications for the future design of networks that feature communication and signaling between the components.
An out‐of‐equilibrium state of a synthetic molecular machine is used to control catalysis. A rotaxane is transiently converted from a catalytically inactive state into an active form by CCl3CO2H. Deprotonation by the rotaxane promotes decarboxylation of the acid, thereby returning the system to its original state and stopping catalysis. This process allows temporal control of a coupled biomimetic reduction reaction. |
---|---|
Bibliography: | UKRI ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1433-7851 1521-3773 1521-3773 |
DOI: | 10.1002/anie.201905250 |