Tetrairon(III) complexes known as “ferric stars” have been functionalized with azobenzene groups to investigate the effect of light-induced trans–cis isomerization on single-molecule magnet (SMM) behaviour. According to DC magnetic data and EPR spectroscopy, clusters dispersed in polystyrene (4% w/w) exhibit the same spin (S = 5) and magnetic anisotropy as bulk samples. Ligand photoisomerization, achieved by irradiation at 365 nm, has no detectable influence on static magnetic properties. However, it induces a small but significant acceleration of magnetic relaxation as probed by AC susceptometry. The pristine behaviour can be almost quantitatively recovered by irradiation with white light. Our studies demonstrate that magnetic and optical bistability can be made to coexist in SMM materials, which are of current interest in molecular spintronics.

Magnetic and optical bistability in tetrairon(iii) single molecule magnets functionalized with azobenzene groups / Thazhe Kootteri Prasad;Giordano Poneti;Lorenzo Sorace;Maria Jesus Rodriguez-Douton;Anne-Laure Barra;Petr Neugebauer;Luca Costantino;Roberta Sessoli;Andrea Cornia. - In: DALTON TRANSACTIONS. - ISSN 1477-9226. - STAMPA. - 41:(2012), pp. 8368-8378. [10.1039/c2dt30172e]

Magnetic and optical bistability in tetrairon(iii) single molecule magnets functionalized with azobenzene groups

PONETI, GIORDANO;SORACE, LORENZO;SESSOLI, ROBERTA;
2012

Abstract

Tetrairon(III) complexes known as “ferric stars” have been functionalized with azobenzene groups to investigate the effect of light-induced trans–cis isomerization on single-molecule magnet (SMM) behaviour. According to DC magnetic data and EPR spectroscopy, clusters dispersed in polystyrene (4% w/w) exhibit the same spin (S = 5) and magnetic anisotropy as bulk samples. Ligand photoisomerization, achieved by irradiation at 365 nm, has no detectable influence on static magnetic properties. However, it induces a small but significant acceleration of magnetic relaxation as probed by AC susceptometry. The pristine behaviour can be almost quantitatively recovered by irradiation with white light. Our studies demonstrate that magnetic and optical bistability can be made to coexist in SMM materials, which are of current interest in molecular spintronics.
2012
41
8368
8378
Thazhe Kootteri Prasad;Giordano Poneti;Lorenzo Sorace;Maria Jesus Rodriguez-Douton;Anne-Laure Barra;Petr Neugebauer;Luca Costantino;Roberta Sessoli;Andrea Cornia
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/771462
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