It is commonly assumed that recognition and discrimination of chirality, both in nature artificial systems, depend solely on spatial effects. However, recent studies have suggested charge redistribution chiral molecules manifests an enantiospecific preference electron spin orientation. We therefore reasoned the induced polarization may affect enantiorecognition through exchange interactions. Here we show experimentally interaction with a perpendicularly magnetized substrate enantiospecific....

The production of hydrogen through water splitting in a photoelectrochemical cell suffers from an overpotential that limits the efficiencies. In addition, hydrogen-peroxide formation is identified as competing process affecting oxidative stability photoelectrodes. We impose spin-selectivity by coating anode with chiral organic semiconductors helically aggregated dyes sensitizers; Zn-porphyrins and triarylamines. Hydrogen peroxide dramatically suppressed, while overall current cell,...

We demonstrate a facile route to obtain high and broad-band circular polarization of electroluminescence in single-layer polymer OLEDs. As light-emitting material we use donor–acceptor polyfluorene with enantiomerically pure chiral side-chains. show that upon thermal annealing the self-assembles into multidomain cholesteric film. By varying thickness emitting layer, achieve levels (up 40% excess right-handed polarization), which are highest reported for OLEDs not using dopants or alignment...

Abstract Organic semiconductors and organic–inorganic hybrids are promising materials for spintronic‐based memory devices. Recently, an alternative route to organic spintronic based on chiral‐induced spin selectivity (CISS) is suggested. In the CISS effect, chirality of molecular system itself acts as a filter, thus avoiding use magnets injection. Here, filtering in excess 85% helical π‐conjugated supramolecular nanofibers at room temperature reported. The high spin‐filtering efficiency can...

The theoretical explanation for the chiral-induced spin selectivity effect, in which electrons' passage through a chiral system depends on their and handedness of system, remains incomplete. Although most experimental work was performed at room temperature, proposed theories did not include vibrations. Here, we present temperature-dependent experiments model that captures all observations provides polarization values are consistent with results. includes vibrational contribution to orbit...

Photoelectrochemical (PEC) water splitting is a promising approach for generating hydrogen from water. In order to enhance PEC efficiency, it essential inhibit the production of peroxide byproduct and reduce overpotential required by an inexpensive catalyst with high current density. past, was shown that coating TiO2 electrodes chiral molecules or films enhances reduces H2O2 byproduct. This explained be result chiral-induced spin selectivity (CISS) effect induces correlation between...

DOI: 10.1002/adma.201405249 electrode. By controlling the direction of magnetization nickel, it is possible to inject electrons that have mainly one spin orientation and verify their transport through PCT by monitoring cyclic voltammetry (CV) curve in electrochemical cell which redox couple not chiral. The CV curves refl ect a steady state double layer formed near working Another method monitor selectivity chronoamperometry, monitors time-dependent current at fi xed potential. At beginning,...

This work demonstrates the chiral-induced spin selectivity effect for inorganic copper oxide films and exploits it to enhance chemical in electrocatalytic water splitting. Chiral CuO are electrodeposited on a polycrystalline Au substrate, their filtering electrons is demonstrated using Mott polarimetry analysis of photoelectrons. known act as an electrocatalyst oxygen evolution reaction; however, also generates side products such H2O2. We show that chiral selective O2; H2O2 generation...

We show that enantioselective reactions can be induced by the electron spin itself and it is possible to replace a conventional enantiopure chemical reagent spin-polarized electrons provide chiral bias for reactions. Three examples of chemistry resulting from electron-spin polarization are presented. One demonstrates association molecule with an achiral self-assembled monolayer film spin-polarized, while other two provided helicity drive both reduction oxidation in enantiospecific...

Enantiospecific crystallization of the three amino acids asparagine (Asn), glutamic acid hydrochloride (Glu·HCl) and threonine (Thr), induced by ferromagnetic (FM) substrates, is reported. The FM substrates were prepared evaporating nickel capped with a thin gold layer on standard silicon wafers. Magnets positioned underneath substrate either their North (N) or South (S) poles pointing up. Asymmetric induction, controlled magnetic was demonstrated for pure enantiomers then extended racemic...

Controlled reduction of oxygen is important for developing clean energy technologies, such as fuel cells, and vital to the existence aerobic organisms. The process starts with in a triplet ground state ends products that are all singlet states. Hence, spin constraints must be considered. Here, we show electron transfer efficiency from chiral electrodes (oxygen reaction) enhanced over achiral electrodes. We demonstrate lower overpotentials higher current densities catalysts versus ones. This...

It is shown that "spontaneous magnetization" occurs when chiral oligopeptides are attached to ferrocene and self-assembled on a gold substrate. As result, the electron transfer, measured by electrochemistry, shows asymmetry in reduction oxidation rate constants; this reversed between two enantiomers. The results can be explained induced spin selectivity of transfer. magnetization high anisotropy "easy axis" along molecular axis.

Essential aspects of the chiral induced spin selectivity (CISS) effect and their implications for spin-controlled chemistry asymmetric electrochemical reactions are described. The generation oxygen through electrolysis is discussed as an example in which chirality-based spin-filtering selection rules can be used to improve reaction's efficiency selectivity. Next discussion shifts illustrate how molecules (CISS properties) allows one use electron a bias inducing promoting enantiospecific...

Efficient photo-electrochemical production of hydrogen from water is the aim many studies in recent decades. Typically, one observes that electric potential required to initiate process significantly exceeds thermodynamic limit. It was suggested by controlling spins electrons are transferred solution anode, and ensuring they coaligned, threshold voltage for can be decreased voltage. In present study, using anodes coated with chiral conductive polymer, enhanced, reduced, as compared achiral...

Spin based properties, applications, and devices are typically related to inorganic ferromagnetic materials. The development of organic materials for spintronic applications has long been encumbered by its reliance on electrodes polarized spin injection. discovery the chirality-induced selectivity (CISS) effect, in which chiral molecules serve as filters, defines a marked departure from this paradigm because it exploits soft materials, operates at ambient temperature, eliminates need...

We describe the spin polarization–induced chirogenic electropolymerization of achiral 2-vinylpyridine, which forms a layer enantioenhanced isotactic polymer on electrode. The product formed is enantioenriched in asymmetric carbon polymer. To confirm chirality film electrode, we also measured its electron polarization properties as function thickness. Two methods were used: First, was by applying magnetic contact atomic force microscopy, and second, magnetoresistance assessed sandwich-like...

This article reports on a facile and fast strategy for the self-assembled monolayer (SAM) functionalization of nickel surfaces, employing cyclic voltammetry (CV) cycling suitable tailored solution containing species to be adsorbed. Results are presented ultrathin films formed Ni by 1-hexadecanethiol (C16), L-cysteine (L-cys), poly{methyl (2R)-3-(2,2'-bithiophen-4-ylsulfanyl)-2-[(tert-butoxycarbonyl)amino]propanoate} (PCT-L) thiophene-based chiral polymer. The effective formation high-quality...

Studies on conjugated polymers seldom report their NMR characterization in solution. This paper shows how experiments, both 1H and routine 2D spectra, can help gaining a further insight into the aggregation behavior of could be used to flank more employed solid-state other spectroscopy microscopy techniques understanding processes. allows distinguishing, within class poorly solvatochromic polymers, those highly prone form π-stacked aggregates from ones that have low tendency toward π-stacking.

The steady-state charge and spin transfer yields were measured for three different Ru-modified azurin derivatives in protein films on silver electrodes. While the charge-transfer exhibit weak temperature dependences, consistent with operation of a near activation-less mechanism, selectivity electron improves as increases. This enhancement is explained by vibrationally induced exchange interaction between Cu(II) its chiral ligands. These results indicate that distinct mechanisms control...

Abstract Monolayers of chiral molecules can preferentially transmit electrons with a specific spin orientation, introducing as efficient filters. This phenomenon is established chirality‐induced selectivity (CISS) and was demonstrated directly for the first time in self‐assembled monolayers (SAMs) double‐stranded DNA (dsDNA) 1 . Here, we discuss SAMs peptide nucleic acid (dsPNA) system which allows systematic investigations influence various molecular properties on CISS. In photoemission...

It is established that electron transmission through chiral molecules depends on the electron's spin. This phenomenon, termed chiral-induced spin selectivity (CISS), effect has been observed in molecules, supramolecular structures, polymers, and metal-organic films. Which preferred handedness of system tunneling direction electrons. Molecular motors based overcrowded alkenes show multiple inversions helical chirality under light irradiation thermal relaxation. The authors found here...

Significance In contrast to conventional electronics, spintronics devices exploit the electron spin as an additional degree of freedom. The chirality-induced selectivity (CISS) effect, in which chiral molecules act filters transport, provides a pathway control spins molecules. We describe approach that integrates both spin-polarizing and spin-propagating functionality into organic structures feature low charge transport resistances. Binding ligands molecular wires controls polarized...

The spin–spin interactions between chiral molecules and ferromagnetic metals were found to be strongly affected by the induced spin selectivity effect. Previous works unraveled two complementary phenomena: magnetization reorientation of thin film upon adsorption different interaction rate opposite enantiomers with a magnetic substrate. These phenomena all observed when easy axis ferromagnet was out plane. In this work, effects direction, on both molecular monolayer tilt angle substrate, are...

In this paper we present the synthesis and characterization of two novel copolymers obtained from a bithiophene unit carrying octylsulfanyl side chains thienothiophene units substituted with keto (PK) or ester (PE) groups. Their structural, electrochemical photophysical properties were investigated by gel permeation chromatography (GPC), thermogravimetric analysis (TGA), NMR, UV-visible-NIR spectroscopy, cyclic voltammetry (CV) atomic force microscopy (AFM). They possess good solubility in...