Abstract
In this work, we are presenting magnetic field dependent electrochemical method to grow enantiopure monolayer. Thiol gold monolayer formation by redox reaction is studied on gold coated ferromagnetic surface. Infrared and photoemission spectroscopies are used to probe the quality of the monolayers, grown using different direction of magnetization of surface. Commercially available chiral molecules, L-cysteine along with dsDNA are used as control molecules for the measurements. Since it is established by aligning the electron spin within the surface, it helps to adsorb specific enantiomer of molecules, we have shown how direction of the magnet helps to grow good quality monolayer. Potential application of this work is in improving quality of monolayer and chiral separation.
Highlights
It was discovered that electron spin during its transfer can be controlled by chiral molecules which is known as Chiral Induced Spin Selectivity (CISS), recently it is established, charge distribution within chiral molecules is spin specific phenomena, which is known as spin polarization [1,2,3,4,5]
It is believed that the enantiospecific interaction between ferromagnetic surface with chiral molecule is a combined effect of dipole electric field and exchange interaction
The Cyclic voltammetry (CV) response shows continues increase of the area under curve which is due to formation ionic layers at the surface–electrolyte interface, where the most-near to surface molecules participate in monolayer formation
Summary
It was discovered that electron spin during its transfer can be controlled by chiral molecules which is known as Chiral Induced Spin Selectivity (CISS), recently it is established, charge distribution within chiral molecules is spin specific phenomena, which is known as spin polarization [1,2,3,4,5]. It is believed that the enantiospecific interaction between ferromagnetic surface with chiral molecule is a combined effect of dipole electric field and exchange interaction. The interaction between the surface and spin polarized molecules is electrostatic, and exchange-interaction In these interactions, unpaired electrons of specific spin, plays vital role in selection of handedness of the molecules. This concept becomes more significant when it comes to the electrochemical method, where the electric field helps to polarize the molecule, and drives them toward the surface. The magnetic field on the ferromagnetic surface works as catalyst and help in enantiospecific recognition of molecules and improve their adsorption. We compare the quality of the monolayer of enantiomer by switching the spin of the working electrode, showing a change in the IR and X-ray photoemission spectra
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