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SYNTHESIS AND PROPERTIES OF F-BLOCK ORGANOMETALLICS: EN ROUTE TO THE Φ-BOND

Project description

Characterising f-block organometallics with a focus on the enigmatic phi bond

The electronic structures and bonding of rare earth elements and actinides, also called f-elements, have garnered increasing attention recently. The f-elements have many applications in important high-tech fields, including optics, magnetism, catalysis, energy and quantum technologies. Phi (φ) bonds, a new, fourth type of chemical covalent bond involving f-orbitals, were predicted to exist but only recently discovered experimentally. Characterising φ-interactions will be fundamental to understanding and rational design of organometallics for future devices and technologies. The EU funded PhiBond project will synthesise compounds with high symmetry and leverage symmetry locking to shed light on enigmatic φ bonds.

Objective

If the f-elements; rare earths and actinides, have many applications in various fields (catalysis, materials for optics, for magnetism, for energy and quantum technologies), major fundamental questions yet remain to be discovered. The nature of the interactions between the f orbitals, which have a low radial extension, and their surroundings is still in question. Indeed, if the buried-character of f-electrons confers their compounds with some of their properties, this particularly harms the description of covalent bonds of φ-symmetry. More specifically, the interaction of two φ-symmetry metallic orbitals, which would lead to the description of φ-bonds, is sorely lacking in the landscape of molecular chemistry. In order to exacerbate the interactions with f- orbitals, we propose to use the argument of symmetry, locking the f orbitals in an ideal configuration, which will make the description of φ-interactions easier to study. We propose to use original large aromatic ligands in order to synthesize compounds of high symmetry. This approach notably differs from the current one, which aims to sterically hinder conventional ligands with large substituents. Once the symmetry is locked, we will vary the electron count and the redox state, as well as the ligand field by modulating the 4f- or 5f-ion used, including transuranic elements. The organometallic synthesis of the these original 4f- and 5f-compounds will be followed by experimental electronic density studies as well as adapted spectroscopy, which will shed light on the interactions of φ−symmetry. Unusual radioelements, uranium and more classical rare earth metal ions will thus lead to an overall assessment of the necessary requirements to enhance the interactions and move towards molecules containing several f-metal ions and a small intermetallic distance. The redox and physical properties of the latter compounds will be engineered with the aim of forming molecules containing metal-metal interactions of φ-symmetry.

Fields of science (EuroSciVoc)

CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: https://op.europa.eu/en/web/eu-vocabularies/euroscivoc.

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Host institution

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE CNRS
Net EU contribution
€ 1 999 226,00
Address
RUE MICHEL ANGE 3
75794 Paris
France

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Region
Ile-de-France Ile-de-France Hauts-de-Seine
Activity type
Research Organisations
Links
Total cost
€ 1 999 226,00

Beneficiaries (1)