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Spin-Delocalization with a Twist: Chiral Open-Shell Helices

Total Cost €


EC-Contrib. €






 INSPIRAL project word cloud

Explore the words cloud of the INSPIRAL project. It provides you a very rough idea of what is the project "INSPIRAL" about.

antiferromagnetic    tailor    single    molecule    magneto    multiple    solid    communicate    principles    made    unpaired    designing    material    tune    molecular    unexpectedly    batteries    shell    containing    character    optical    additionally    architectures    mode    phenomenon    crystallization    dictates    tuned    strength    interplay    synthesize    assemblies    helices    gives    molecules    overlap    atoms    arise    couples    abets    display    bistable    conductors    ferromagnetic    spin    spiral    chiral    distance    bonding    simultaneously    unusual    named    understand    governs    bulk    electronic    radical    govern    phenalenyl    oriented    intermolecular    provides    bond    versus    inspired    electrons    fundamental    space    materials    interaction    degree    interactions    units    backbone    pancake    pairs    difficult    enantiopure    spontaneous    coupling    varying    tuning    spins    racemic    helical    delocalization    intramolecular    assembly    model   

Project "INSPIRAL" data sheet

The following table provides information about the project.


Organization address
address: RAMISTRASSE 71
city: Zürich
postcode: 8006

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
telephone: n.a.
fax: n.a.

 Coordinator Country Switzerland [CH]
 Total cost 1˙499˙925 €
 EC max contribution 1˙499˙925 € (100%)
 Programme 1. H2020-EU.1.1. (EXCELLENT SCIENCE - European Research Council (ERC))
 Code Call ERC-2016-STG
 Funding Scheme ERC-STG
 Starting year 2017
 Duration (year-month-day) from 2017-04-01   to  2022-03-31


Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 
1    UNIVERSITAT ZURICH CH (Zürich) coordinator 1˙499˙925.00
2    UNIVERSITAT BASEL CH (BASEL) participant 0.00


 Project objective

Spin-delocalization in molecules containing unpaired electrons gives rise to an unusual intermolecular interaction, named as pancake bond. This bonding interaction couples unpaired electrons between multiple pairs of atoms from each face-to-face oriented spin units, such as phenalenyl radical, and abets formation of assemblies that display large antiferromagnetic interaction in the solid state. This phenomenon governs the potential use of such spin systems as molecular conductors, magneto-optical bistable materials, or molecular spin batteries. Formation of such assemblies during crystallization is spontaneous. It is therefore difficult to control and tune the antiferromagnetic interaction, which dictates the electronic properties of the solid material. Inspired by this challenge, the goal of this project is to develop systems, where the spin-interaction can be tuned within a single molecule to understand principles that govern an intermolecular assembly in the solid state and the bulk properties.

To achieve this goal, I propose to synthesize and study chiral open-shell helices, in which the intramolecular spin-interaction can be tuned by varying (1) the coupling mode, ferromagnetic versus antiferromagnetic, and (2) its strength. The helical character of these systems enables tuning of the coupling strength by control of the degree of overlap and distance between the spin units, which is difficult to achieve by a spontaneous assembly. Additionally, it provides access to both racemic and enantiopure solid-state architectures that can further impact the properties. Two model systems will be investigated: one in which spins communicate simultaneously through backbone and space, and one where spins communicate only through space. Understanding the principles of spin-interactions in these helical systems is of fundamental interest for designing molecules with tailor-made properties, as well as features that arise unexpectedly from the interplay of the spins in a spiral.


year authors and title journal last update
List of publications.
2019 Peter Ribar, Tomáš Šolomek, Michal Juríček
Gram-Scale Synthesis and Supramolecular Complex of Precursors of Clar’s Hydrocarbon Triangulene
published pages: 7124-7128, ISSN: 1523-7060, DOI: 10.1021/acs.orglett.9b02683
Organic Letters 21/17 2019-12-16
2019 Daniel Čavlović, Michal Juríček
Molecular Magnetic Switches
published pages: 313-316, ISSN: 0009-4293, DOI: 10.2533/chimia.2019.313
CHIMIA International Journal for Chemistry 73/4 2019-12-16
2019 Prince Ravat, Olivier Blacque, Michal Juríček
Benzo[ cd ]triangulene: A Spin 1/2 Graphene Fragment
published pages: , ISSN: 0022-3263, DOI: 10.1021/acs.joc.9b02163
The Journal of Organic Chemistry 2019-12-16
2019 Prince Ravat, Tomáš Šolomek, Michal Juríček
Helicenes as Chiroptical Photoswitches
published pages: 180-186, ISSN: 2367-0932, DOI: 10.1002/cptc.201800229
ChemPhotoChem 3/4 2019-12-16
2018 Tomáš Šolomek, Prince Ravat, Zhongyu Mou, Miklos Kertesz, Michal Juríček
Cethrene: The Chameleon of Woodward–Hoffmann Rules
published pages: 4769-4774, ISSN: 0022-3263, DOI: 10.1021/acs.joc.8b00656
The Journal of Organic Chemistry 83/8 2019-04-18
2018 Prince Ravat, Tomáš Šolomek, Daniel Häussinger, Olivier Blacque, Michal Juríček
Dimethylcethrene: A Chiroptical Diradicaloid Photoswitch
published pages: 10839-10847, ISSN: 0002-7863, DOI: 10.1021/jacs.8b05465
Journal of the American Chemical Society 140/34 2019-04-18
2018 Michal Juríček
The Three C\'s of Cethrene
published pages: 322-327, ISSN: 0009-4293, DOI: 10.2533/chimia.2018.322
CHIMIA International Journal for Chemistry 72/5 2019-04-18
2017 Ravat, Prince; Hinkelmann, Rahel; Steinebrunner, David; Prescimone, Alessandro; Bodoky, Ina; Juricek, Michal
Configurational Stability of [5]Helicenes
published pages: 3707-3710, ISSN: 1523-7052, DOI: 10.5167/uzh-139463
Organic Letters 19/14 2019-04-18

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