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Control of Spin Interactions in Helical Systems

English title Control of Spin Interactions in Helical Systems
Applicant Juricek Michal
Number 170534
Funding scheme SNSF Professorships
Research institution Institut für Chemie Universität Zürich
Institution of higher education University of Zurich - ZH
Main discipline Organic Chemistry
Start/End 01.04.2017 - 31.03.2021
Approved amount 1'599'956.00
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Keywords (10)

Organic radicals; Open-shell molecules; Spin-delocalization; Helical chirality; Spin coupling; Singlet-triplet gap; Magnetic properties; Conducting properties; Magneto-chiral effects; Spintronics

Lay Summary (German)

Lead
The goal of this project is to learn how to control bulk magnetic and conducting properties of materials made from organic molecules by taking control over the spin interaction between unpaired electrons.
Lay summary

Molecule-based systems that take advantage of the quantum property of electrons, called spin, may one day lead to the next breakthrough in fabrication of information processing devices, such as computers and smartphones. For designing and making such systems, materials that contain unpaired electrons are needed. Although past research in this field has relied almost exclusively on the use of inorganic materials, organic materials—on top of being cheaper and lighter—offer the possibility to create new functionalities by taking advantage of virtually an unlimited freedom one has when it comes to molecular design. Organic molecules that carry unpaired electrons could therefore serve as the basic functional unit of a material, where the spin interactions between unpaired electrons dictate its bulk properties and give rise to physical phenomena such as conductivity and magnetism. A combination of properties can give rise to new functionalities, as in the case of effects that arise from the interplay of chirality and magnetism. These effects, however, are rare and have only been observed on several occasions. To gain a better understanding of these effects, the aim of this project is to develop chiral spin model systems where these phenomena can be investigated systematically, that is, systems were spin interactions between unpaired electrons can be tuned precisely to match a desired feature. Because it remains difficult to control the coupling of spins of unpaired electrons in a bulk material, it is crucial to learn how to manipulate this delicate balance of interactions on a molecular level first. Ultimately, this investigation will deliver a set of principles, which will allow the design of chiral molecule-based materials, where magnetic and conducting properties can be switched on and off in the solid state by light.

Direct link to Lay Summary Last update: 30.03.2017

Responsible applicant and co-applicants

Employees

Publications

Publication
Molecular Magnetic Switches
Čavlović Daniel, Juríček Michal (2019), Molecular Magnetic Switches, in CHIMIA International Journal for Chemistry, 73(4), 313-316.
Helicenes as Chiroptical Photoswitches
Ravat Prince, Šolomek Tomáš, Juríček Michal (2019), Helicenes as Chiroptical Photoswitches, in ChemPhotoChem, 3(4), 180-186.
Dimethylcethrene: A Chiroptical Diradicaloid Photoswitch
Ravat Prince, Šolomek Tomáš, Häussinger Daniel, Blacque Olivier, Juríček Michal (2018), Dimethylcethrene: A Chiroptical Diradicaloid Photoswitch, in Journal of the American Chemical Society, 140(34), 10839-10847.
The Three C's of Cethrene
Juríček Michal (2018), The Three C's of Cethrene, in Chimia, 72(5), 322-327.
Cethrene: The Chameleon of Woodward–Hoffmann Rules
Šolomek Tomáš, Ravat Prince, Mou Zhongyu, Kertesz Miklos, Juríček Michal (2018), Cethrene: The Chameleon of Woodward–Hoffmann Rules, in The Journal of Organic Chemistry, 83(8), 4769-4774.
Configurational Stability of [5]Helicenes
Ravat Prince, Hinkelmann Rahel, Steinebrunner David, Prescimone Alessandro, Bodoky Ina, Juríček Michal (2017), Configurational Stability of [5]Helicenes, in Organic Letters, 19(14), 3707-3710.

Collaboration

Group / person Country
Types of collaboration
Dr Tomáš Šolomek, University of Basel Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Professor Miklos Kertesz, Georgetown University, Washington D.C. United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Professor Ali Coskun, University of Fribourg Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Professor Araceli Campana, University of Granada Spain (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Exchange of personnel
Professor Gunnar Jeschke, ETH Zurich Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
Professor Karl-Heinz Ernst, Empa, Dübendorf Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
Invited Lecture (AIBN, University of Queensland, Department Seminar) Individual talk When spins do the twist 20.12.2018 Brisbane, Australia Juricek Michal;
Singapore International Chemistry Conference (SICC) Talk given at a conference Chiral diradicaloid switches operated by light 16.12.2018 Singapore, Singapore Juricek Michal;
SCS Fall Meeting Poster A chiroptical and magnetic diradicaloid photoswitch 07.09.2018 Lausanne, Switzerland Cavlovic Daniel;
SCS Fall Meeting Poster [85] & [95]Cethrenes: Chiroptical & magnetic switches 07.09.2018 Lausanne, Switzerland Pastierik Tomáš;
International Symposium on the Synthesis and Application of Curved Organic π-Molecules & Materials (CURO-π3) Talk given at a conference Cethrenes: Magnetic & chiroptical switches 05.09.2018 Oxford, Great Britain and Northern Ireland Juricek Michal;
International Symposium on Reactive Intermediates and Unusual Molecules (ISRIUM) Talk given at a conference Chameleonic electrocyclic reactions of helical diradicaloids – 'cethrenes' 15.07.2018 Ascona, Switzerland Juricek Michal;
Doktorandentag UZH Poster [85] & [95]Cethrenes: Chiroptical & magnetic switches 03.07.2018 Zurich, Switzerland Pastierik Tomáš;
Doktorandentag UZH Poster A chiroptical and magnetic diradicaloid photoswitch 03.07.2018 Zurich, Switzerland Cavlovic Daniel;
Invited Lecture (Department Seminar, University of Tübingen) Individual talk When spins do the twist: Design & function of diradicaloid photoswitches 12.06.2018 Tübingen, Germany Juricek Michal;
GRK 2112 Symposium "Molecular Biradicals: Structure, Properties and Reactivity" Talk given at a conference Singlet Diradicaloid Cethrene: The Chameleon of Woodward–Hoffmann Rules 27.02.2018 Würzburg, Germany Juricek Michal;
CMSZH Graduate School Retreat Talk given at a conference On the Road 18.01.2018 Evolène, Switzerland Juricek Michal;
International Symposium on Novel Aromatic Compounds (ISNA) Talk given at a conference Chiroptical Biradicaloid Switches 23.07.2017 Stony Brook, NY, United States of America Juricek Michal;
A Golden Age for Chemistry Talk given at a conference Group Therapy 9 25.06.2017 Nottingham, Great Britain and Northern Ireland Juricek Michal;
International Symposium on Reactive Intermediates and Unusual Molecules (ISRIUM) Talk given at a conference When Spins do the Twist: Unusual Reactivity of Helical Biradicaloids 18.06.2017 Sorrento, Italy Juricek Michal;


Communication with the public

Communication Title Media Place Year
Talks/events/exhibitions Science Info Day, MNF, UZH German-speaking Switzerland 2019
New media (web, blogs, podcasts, news feeds etc.) Communication of research news on Twitter feed Twitter International 2017

Awards

Title Year
Best Poster Award at Doktorandentag, UZH 2018
Best Poster Award at Doktorandentag, UZH 2018
Best Presentation Award at ISRIUM, ETH Zurich and Congressi Stefano Franscini 2018
SCS-DSM Award for Best Poster Presentation in Organic Chemistry, SCS Fall Meeting, Lausanne 2018

Associated projects

Number Title Start Funding scheme
148043 Quantum Information Processing Devices: Emergence of High-Spin Nanographenes 01.11.2013 Ambizione

Abstract

Multifunctional molecule-based systems that take advantage of electron spin in addition to electron charge may one day lead to the next breakthrough in fabrication of information processing devices. For designing and making such systems, materials that contain unpaired electrons are needed. Although past research in this field has relied almost exclusively on the use of inorganic materials, organic materials-on top of being cheaper and lighter-offer the possibility to create new functionalities by taking advantage of virtually an unlimited freedom one has when it comes to molecular design. Organic molecules that carry unpaired electrons can serve as the basic functional unit of a spintronic (= spin + electronic) material, where the spin interactions between unpaired electrons dictate its bulk properties and give rise to physical phenomena such as conductivity and magnetism. A combination of properties can give rise to new functionalities, as in the case of effects that arise from the interplay of chirality and magnetism. These effects, however, are rare and have only been observed on several occasions. To gain a better understanding of these effects, the aim of this project is to develop chiral spin model systems where these phenomena can be investigated systematically, that is, systems were spin interactions between unpaired electrons can be tuned precisely to match a desired feature. Because it remains difficult to control the coupling of spins of unpaired electrons in a bulk material, it is crucial to learn how to manipulate this delicate balance of interactions on a molecular level first. Ultimately, this investigation will deliver a set of principles, which will allow the design of chiral molecule-based materials, where spin interactions and the resulting properties can be switched on and off in the solid state by an external stimulus such as light.
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