Spin Filtering in Supramolecular Polymers Assembled from Achiral Monomers Mediated by Chiral Solvents

Mondal, Amit Kumar; Preuss, Marco D.; Ślęczkowski, Marcin L.; Das, Tapan Kumar; Vantomme, Ghislaine; Meijer, E. W.; Naaman, Ron

doi:10.1021/jacs.1c02983

Cited by 79 publications

(88 citation statements)

References 43 publications

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“…These experimental and computational data that characterize the chiro-optic properties associated with the low-energy electronic states of chiral PZn n SAc-B R/S wires, coupled with the fact that the magnetic dipole operator is the same as the one that factors into the SOC Hamiltonian, suggest a pathway to realize SOCs that are large relative to those determined for soft material benchmarks ( 10 – 13 ) and thus facilitate enhanced CISS-derived spin polarization. While there is no theoretical model that explicitly links chiro-optic response with charge polarization–induced spin-polarization magnitudes in a comprehensive and fully quantitative way, a qualitative connection along these lines has been noted ( 38 – 42 ).…”

Section: Resultsmentioning

confidence: 99%

Twisted molecular wires polarize spin currents at room temperature

Zhu

Tassinari

et al. 2022

Proc. Natl. Acad. Sci. U.S.A.

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Significance In contrast to conventional electronics, spintronics devices exploit the electron spin as an additional degree of freedom. The chirality-induced spin selectivity (CISS) effect, in which chiral molecules act as spin filters in electron transport, provides a pathway to control spins in molecules. We describe an approach that integrates both spin-polarizing and spin-propagating functionality into organic structures that feature low charge transport resistances. Binding chiral ligands to molecular wires controls polarized spin handedness, regulates spin currents, generates large NIR rotational strengths, and provides a mechanism to flip the favored spin orientation for spin transmission through chiral organic molecules. This work points the way to materials that provide both high spin selectivity and large-magnitude spin currents via the CISS mechanism.

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Section: Resultsmentioning

confidence: 99%

Twisted molecular wires polarize spin currents at room temperature

Zhu

Tassinari

et al. 2022

Proc. Natl. Acad. Sci. U.S.A.

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“…It explains not only why it is so efficient in biological processes such as photosynthesis or respiration, but also the reasons for preferred enantioselective recognition in living organisms ( Michaeli et al, 2016 ). In addition, other processes in which electrons are transferred in a way that only one spin state prevails are interesting for many applications in chemistry and electronics, since it enables the fabrication of electronic devices using chiral organic molecules instead of ferromagnets ( Dor et al, 2013 ; Mathew et al, 2014 ; Koplovitz et al, 2017 ; Mtangi et al, 2017 ; Mondal et al, 2021 ).…”

Section: Main Supramolecular Structures Where Ciss Effect Has Been Studiedmentioning

confidence: 99%

“…(E) Supramolecular polymers where self-assembled helical structures (M or P) are formed from achiral molecules in the presence of chiral solvents. Adapted with permission from Mondal et al 2021 . Copyright 2021 American Chem Society.…”

Section: Main Supramolecular Structures Where Ciss Effect Has Been Studiedmentioning

confidence: 99%

“…More recently, spin polarization was identified in achiral polymers with a preferred helical arrangement induced by the use of chiral solvents. The authors used triphenylene-2,4,10-tricarboxamide derivatives, whose supramolecular chirality is biased to get either P - or M -helices when using chiral solvents ( Mondal et al, 2021 ) ( Figure 2E ). The inversion of supramolecular chirality by means of temperature and solvent when using the same enantiomer affects spin selectivity, and confirms the importance of supramolecular orientation in selective spin transport.…”

Section: Main Supramolecular Structures Where Ciss Effect Has Been Studiedmentioning

confidence: 99%

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The Importance of Spin State in Chiral Supramolecular Electronics

2021

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The field of spintronics explores how magnetic fields can influence the properties of organic and inorganic materials by controlling their electron’s spins. In this sense, organic materials are very attractive since they have small spin-orbit coupling, allowing long-range spin-coherence over times and distances longer than in conventional metals or semiconductors. Usually, the small spin-orbit coupling means that organic materials cannot be used for spin injection, requiring ferromagnetic electrodes. However, chiral molecules have been demonstrated to behave as spin filters upon light illumination in the phenomenon described as chirality-induced spin selectivity (CISS) effect. This means that electrons of certain spin can go through chiral assemblies of molecules preferentially in one direction depending on their handedness. This is possible because the lack of inversion symmetry in chiral molecules couples with the electron’s spin and its linear momentum so the molecules transmit the one preferred spin. In this respect, chiral semiconductors have great potential in the field of organic electronics since when charge carriers are created, a preferred spin could be transmitted through a determined handedness structure. The exploration of the CISS effect in chiral supramolecular semiconductors could add greatly to the efforts made by the organic electronics community since charge recombination could be diminished and charge transport improved when the spins are preferentially guided in one specific direction. This review outlines the advances in supramolecular chiral semiconductors regarding their spin state and its influence on the final electronic properties.

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“…A promising way out of this dilemma is to use Au/Co/Au/chiral-molecules heterostructures, where the spin-state of the electrons within helical molecules adsorbed at the surface of a magnetic substrate can be quantified by means of the magneto-resistance (MR). 5,[20][21][22] The chemically inert Au-capping layer on top of the magnetic layer allows the use of established chemical concepts, e.g. the thiol-mediated chemisorption of molecules and, secondly, non-spin-polarized tips can be used to probe the spin-polarization.…”

Section: Introductionmentioning

confidence: 99%

Cooperative effect of electrons spin polarization in a hybrid nanostructure of a magnetic thin film with adsorbed chiral molecules studied with non-spin-polarized scanning tunneling microscopy

Ha¹,

Rasabathina²,

Hellwig³

et al. 2022

Preprint

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Polyalanine molecules (PA) with an α-helix conformation gathered recently a lot of interest as the propagation of electrons through the chiral backbone structure comes along with spin polarization of the transmitted electrons. By means of scanning tunneling microscopy and spectroscopy at ambient conditions, PA molecules adsorbed on surfaces of epitaxial magnetic Al 2 O 3 /Pt/Au/Co/Au nanostructures with perpendicular anisotropy were studied. Thereby, a correlation between the PA molecules ordering at the surface with the electron tunneling across this hybrid system as a function of the substrate magnetization orientation as well as the coverage density and helicity of the was observed. The highest spin polarization values, P, were found for well-ordered self-assembled monolayers and with a defined chemical coupling of the molecules to the magnetic substrate surface, showing that the current induced spin selectivity is a cooperative effect. Thereby, P deduced from the electron transmission along unoccupied molecular orbitals of the helical molecules is larger as compared to values derived from the occupied molecular orbitals. Apparently, the larger orbital overlap is resulting in a higher electron mobility yielding a higher P value. By switching the magnetization direction of the Co-layer, it was demonstrated that the non-spin-polarized STM can be used to study chiral molecules with a sub-molecular resolution, to detect properties of buried magnetic layers and to detect the spin polarization of the molecules from the change of the magnetoresistance of such hybrid structures.

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Spin Filtering in Supramolecular Polymers Assembled from Achiral Monomers Mediated by Chiral Solvents

Cited by 79 publications

References 43 publications

Twisted molecular wires polarize spin currents at room temperature

Twisted molecular wires polarize spin currents at room temperature

The Importance of Spin State in Chiral Supramolecular Electronics

Cooperative effect of electrons spin polarization in a hybrid nanostructure of a magnetic thin film with adsorbed chiral molecules studied with non-spin-polarized scanning tunneling microscopy

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