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SYNTHESE DES COMPOSES POLYMETALLIQUES A COUPLAGE FERROMAGNETIQUE A DES FERROAIMANTS MOLECULAIRES

Objective


The goal of the work was to design molecules exhibiting a high spin in the ground state and then to synthesize molecular based systems exhibiting a spontaneous magnetization. To reach the first goal 2 alternative strategies were used. The first strategy consisted of achieving ferromagnetic interaction between nearest neighbour magnetic centres due to the strict orthogonality of the magnetic orbitals. The second strategy consisted of polarizing high local spins along one direction involving antiferromagnetic interactions with small local spins. It was found that it has not necessary to achieve ferromagnetic interactions to obtain a high spin molecule.

Work was also carried out on:
molecular based ferromagnets;
equally spaced chain compounds;
alternating bimetallic chain compounds;
rare earths containing magnetic species.

Results from the research gives new perspectives in the field of the molecular based ferromagnets and molecular compounds exhibiting spontaneous magnetization have been synthesized with critical temperatures up to 14K. Also, accurate information has been obtained on intrachain and interchain reactions.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

Centre National de la Recherche Scientifique (CNRS)
Address

91405 Orsay
France

Participants (1)

UNIVERSITY OF FLORENCE
Italy
Address
75/77,Via Gino Capponi 9
50121 Firenze