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Single-molecule magnets based on the orbitally-degenerate spin centers and stable organic radicals complexes

Coordinatore	NIKOLAEV INSTITUTE OF INORGANIC CHEMISTRY THE SIBERIAN BRANCH OF THE RUSSIAN ACADEMY OF SCIENCES    more  Organization address address: PR AKAD LAVRENTIEVA 3 city: NOVOSIBIRSK postcode: 630090 contact info Titolo: Dr. Nome: Sergey N. Cognome: Konchenko Email: send email Telefono: 73833365831 Fax: 73833309489
Nazionalità Coordinatore	Russian Federation [RU]
Totale costo	15˙000 €
EC contributo	15˙000 €
Programma	FP7-PEOPLE Specific programme "People" implementing the Seventh Framework Programme of the European Community for research, technological development and demonstration activities (2007 to 2013)
Code Call	FP7-PEOPLE-2011-IIF
Funding Scheme	MC-IIFR
Anno di inizio	2014
Periodo (anno-mese-giorno)	2014-09-01   -   2015-08-31

 Partecipanti

#	participant	country	role	EC contrib. [€]
1	NIKOLAEV INSTITUTE OF INORGANIC CHEMISTRY THE SIBERIAN BRANCH OF THE RUSSIAN ACADEMY OF SCIENCES  Organization address address: PR AKAD LAVRENTIEVA 3 city: NOVOSIBIRSK postcode: 630090 contact info Titolo: Dr. Nome: Sergey N. Cognome: Konchenko Email: send email Telefono: 73833365831 Fax: 73833309489	RU (NOVOSIBIRSK)	coordinator	15˙000.00

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 Obiettivo del progetto (Objective)

The finding some polynuclear complexes can behave like magnets on the molecular level attracted much attention, opening perspectives for their applications in processing devices or for high density information storage carriers. To manifest single-molecule magnet (SMM) behaviour a polynuclear complex should have a high-spin ground-state and strong negative anisotropy (D). The energy barrier, U, separating two spin orientations (up-down) is proportional to the product of │D│ and square of spin, S. Therefore the larger the D and S values are the higher the U barriers should be and the longer the magnetization might be blocked. However, such single-molecule magnetization is so far only observed at temperatures too low to allow an application. The project aims to rise the blocking temperature by increasing the U. Our approach is based on heterospin polynuclear complexes assembling involving orbitally-degenerated 4d, 5d metal centres (Os, Ru) and 3d metal ions or/and nitroxide radicals. If the utilisation of the first guaranties the strong anisotropy, the use of the stable radicals as ligands and bridges assures well isolated high spin ground-state owing to the strong exchange interactions between spin carriers. The synthesis work will be complemented with structural analysis and magnetic studies of these systems to elucidate the magnetic interactions as well the magnetic anisotropy in conjunction with theoretical magneto-structural analysis. A major goal of the project is to discover some rules for the rational design of polynuclear cluster systems with elevated blocking temperatures. The project results will document the coordination chemistry of 4d and 5d ions with nitroxides, a field lacking of fundamental results. The complexes will bring experimental opportunity to test and improve theoretical models. The project might be considered as a step toward molecular spintronics. Prototypes of devices could be envisioned if the right property shows up at liquid nitrogen.