DS0304 -

Synthesis, study and functionalization of redox-active molecular nanomagnets – ACTIVE-MAGNET

Submission summary

The miniaturization of electronic components is a major challenge. In computer sciences, it is expected by 2019 that Moore’s law will not be able to be respected with classical “top-down” strategies for miniaturization (photolithography…). New approaches and new techniques need to be developed. For data storage and information processing, a potential solution to this large problem can come in the form of single-molecule magnets (SMMs) or single chain magnets (SCMs) as these materials show appealing and potentially useful properties at the molecular scale. Their ability to store information at a nanometric scale makes them ideal candidates for future information storage devices as they offer a potentially much higher information storage density. In addition, their quantum properties can also be used as “qubit” for future quantum computers.

This research project aims at the synthesis, the study and the functionalization of new redox-active SMMs or SCMs with enhanced properties, through a rational design of the molecular components. The redox activity will be provided either by the metal centre or the bridging ligand, or both. This will allow us to tune and sometimes to enhance significantly the magnetic properties of the resulting molecular architectures, with the goal of making molecular magnets with higher operating temperatures, which is a long standing challenge in this research area and a requirement for industrial applications.

The first step for this project will be to make a new class of ligand specially designed i) to act as a redox-active bridge between the metallic spin carriers with the possibility of being stabilized in a radical form, ii) to promote the formation of metal carbon bonds, iii) to stabilize delocalized mixed valence states to promote interesting electronic, optical and improved magnetic properties.

For the metallic spin carrier, the primary focus will be on using 4d/5d metal for several reasons, explained in this proposal, which make them ideal candidates to promote higher operating temperature for the SMMs and SCMs they will be part of.

Initially bimetallic “prototype” systems will be synthesised by reaction of the bridging ligand with “capped” metal centres. This will allow us to undertake complete magnetic and electronic studies of both the metal centres and ligand within the complex. The isolation of these prototype systems will allow the selection of the most interesting building blocks for the synthesis of polynuclear complexes as potential SMMs as well as one dimensional coordination networks with potential SCM properties, with a better understanding of their behaviour. All these new potential enhanced SMMs/SCMs will be fully characterized and investigated.

As well as creating a number of new potential SMMs/SCMs, the bridging ligand will be functionalized by different suitable groups in order to i) “tune” its redox/electronic properties, ii) to increase the solubility, iii) isolate magnetically the complexes or chains, iv) add liquid crystalline properties to the molecular assemblies toward organized magnetically active films.

All the new isolated complexes or chains will be fully characterized by a large number of techniques including X-ray diffraction, cyclic voltammetry, UV/Vis/NIR and IR spectrometry, NMR, calorimetry, SQUID magnetometry and EPR. This will give us a comprehensive understanding of all the properties of the new complexes.

The achievement of this innovative and ambitious research proposal should have a strong impact in the molecular magnetism community, and could contribute to the next generation of some basic components of computers.

Project coordination

Pierre Dechambenoit (Centre de Recherche Paul Pascal)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

CNRS AQUIT. CRPP Centre de Recherche Paul Pascal

Help of the ANR 239,436 euros
Beginning and duration of the scientific project: November 2016 - 42 Months

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