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Radical Solutions for Hysteresis in Single-Molecule Magnets

Objective

Single-molecule magnets (SMMs) display magnetic hysteresis that is molecular in origin, and these materials have huge potential to be developed as nano-scale devices. The big challenge is to create SMMs that function without the need for liquid-helium cooling.

This project will develop new SMMs that combine the strong magnetic anisotropy of lanthanide ions with a series of novel radical ligands. Our innovative SMMs will have controllable molecular and electronic structures, which will ultimately enable hysteresis at unprecedented temperatures.

Highly unusual di- and tri-metallic Ln-SMMs are proposed in which the metals are bridged by radicals with heavy Group 15 (phosphorus-bismuth) and Group 16 (sulphur-tellurium) donor atoms. Trimetallic SMMs will also be based on hexaazatriphenylene (HAT) radicals, and dimetallic SMMs will also be based on nindigo radicals, both of which are nitrogen-donor ligands.

The SMM field is dominated by systems with diamagnetic ligands. Our radical ligands have never been used in SMM studies: their diffuse unpaired spin provides a way of switching off the quantum tunnelling mechanisms that otherwise prevent hysteresis. We will exploit the rich electrochemistry of the target ligands: heavy p-block radicals have huge spin densities on the donor atoms; HAT radicals can have up to three unpaired electrons; reduced or oxidized nindigo radicals allow access to redox-switchable SMMs. In the HAT-bridged SMMs, the use of ligands with more than one unpaired electron is unprecedented. The heavy p-block ligands are themselves are novel.

The PI’s approach to SMMs has already established new directions in lanthanide chemistry and in molecular magnetism. He now proposes a new, radical approach to SMMs with potential to re-define the state of the art, and to extend the frontiers of a vibrant multi-disciplinary field. Achieving the aims will provide a major step towards using SMMs for applications at practical temperatures.

Field of science

  • /natural sciences/chemical sciences/electrochemistry
  • /natural sciences/chemical sciences/inorganic chemistry/metals

Call for proposal

ERC-2014-CoG
See other projects for this call

Funding Scheme

ERC-COG - Consolidator Grant

Host institution

THE UNIVERSITY OF SUSSEX
Address
Sussex House Falmer
BN1 9RH Brighton
United Kingdom
Activity type
Higher or Secondary Education Establishments
EU contribution
€ 1 050 608,57

Beneficiaries (3)

THE UNIVERSITY OF SUSSEX
United Kingdom
EU contribution
€ 1 050 608,57
Address
Sussex House Falmer
BN1 9RH Brighton
Activity type
Higher or Secondary Education Establishments
KATHOLIEKE UNIVERSITEIT LEUVEN
Belgium
EU contribution
€ 17 153,75
Address
Oude Markt 13
3000 Leuven
Activity type
Higher or Secondary Education Establishments
THE UNIVERSITY OF MANCHESTER

Participation ended

United Kingdom
EU contribution
€ 516 439,98
Address
Oxford Road
M13 9PL Manchester
Activity type
Higher or Secondary Education Establishments