Nanoparticles of a spin transition compound

Details Nanoparticles of a spin transition compound Nanoparticles of a spin transition compound

C - Chemistry, Metallurgy

07

F

C07F 15/02 (2006.01) B82B 1/00 (2006.01) G02F 1/01 (2006.01) G11B 7/24 (2006.01)

Patent

CA 2632704

The invention relates to a material composed of nanoparticles essentially comprising a spin transition compound. The compound is of the formula [(Fe1-yMyL3)wL3][X2/x(1-z/x~)Y2z/x~]w, in which L represents a 1,2,4-triazole ligand which bears a substituent R on the nitrogen in position 4; X is an anion of valency x, 1 <= x <= 2; Y is an anion which is other than X and is of valency x~, 1 <= x' <= 2; R is an alkyl group or a group R1R2N in which R1 and R2 each independently of one another represent H or an alkyl radical; M is a metal having a 3d4, 3d5, 3d6 or 3d7 configuration, other than Fe; 0<=y<=1; 0<=z<=2; 3<=w<=1500. Applications: thermochromic pigment, data storage, optical limiters, contrast agent.

L'invention concerne un matériau constitué par des nanoparticules comprenant essentiellement un composé à transition de spin. Le composé répond à la formule : [(Fe1-yMyL3)wL3][X2/x(1-z/x~)Y2z/x~]w, dans laquelle L représente un ligand 1,2,4-triazole portant un substituant R sur l'azote en position 4; X est un anion ayant la valence x, 1 <= x <= 2 ; Y est un anion différent de X ayant la valence x', 1 <= x' <= 2 ; R est un groupe alkyle ou un groupe R1R2N dans lequel R1 et R2 représentent chacun indépendamment de l'autre H ou un radical alkyle ; M est un métal ayant une configuration 3d4, 3d5, 3d6 ou 3d7, autre que Fe ; 0<=y<=1 ; 0<=z<=2 ; 3<=w<=1500. Applications : pigment thermochrome, stockage de données, limitateurs optiques, agent de contraste.

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