We show that enantioselective reactions can be induced by the electron spin itself and that it is possible to replace ac onventional enantiopure chemical reagent by spinpolarized electrons that provide the chiral bias for enantioselective reactions.Three examples of enantioselective chemistry resulting from electron-spin polarization are presented. One demonstrates the enantioselective association of ac hiral molecule with an achiral self-assembled monolayer film that is spin-polarized, while the other two show that the chiral bias provided by the electron helicity can drive both reduction and oxidation in enantiospecific electrochemical reactions.Ineach case,the enantioselectivity does not result from enantiospecific interactions of the molecule with the ferromagnetic electrode but from the polarized spin that crosses the interface between the substrate and the molecule.F urthermore,t he direction of the electron-spin polarization defines the handedness of the enantioselectivity.T his work demonstrates an ew mechanism for realizing enantioselective chemistry.
Conducting polyaniline is deposited into a G-quadruplex-crosslinked pNIPAM copolymer undergoing switchable stimuli-responsive solution/hydrogel/solid transitions.
We study GaAs/AlGaAs
devices hosting a two-dimensional electron
gas and coated with a monolayer of chiral organic molecules. We observe
clear signatures of room-temperature magnetism, which is induced in
these systems by applying a gate voltage. We explain this phenomenon
as a consequence of the spin-polarized charges that are injected into
the semiconductor through the chiral molecules. The orientation of
the magnetic moment can be manipulated by low gate voltages, with
a switching rate in the megahertz range. Thus, our devices implement
an efficient, electric field-controlled magnetization, which has long
been desired for their technical prospects.
We show that enantioselective reactions can be induced by the electron spin itself and that it is possible to replace ac onventional enantiopure chemical reagent by spinpolarized electrons that provide the chiral bias for enantioselective reactions.Three examples of enantioselective chemistry resulting from electron-spin polarization are presented. One demonstrates the enantioselective association of ac hiral molecule with an achiral self-assembled monolayer film that is spin-polarized, while the other two show that the chiral bias provided by the electron helicity can drive both reduction and oxidation in enantiospecific electrochemical reactions.Ineach case,the enantioselectivity does not result from enantiospecific interactions of the molecule with the ferromagnetic electrode but from the polarized spin that crosses the interface between the substrate and the molecule.F urthermore,t he direction of the electron-spin polarization defines the handedness of the enantioselectivity.T his work demonstrates an ew mechanism for realizing enantioselective chemistry.
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