Photoinduced metal-to-metal charge transfer toward single-chain magnet.

Single-chain magnets (SCMs) that exhibit slow relaxation of their magnetization are attracting considerable attention. To tune the properties of such materials with external stimuli such as light, heat, and pressure is a challenge. Through the exploitation of light and heat induced transformation between diamagnetic Fe(II)(LS)(mu-CN)Co(III)(LS) (LS = low spin) units and paramagnetic Fe(III)(LS)(mu-CN)Co(II)(HS) (HS = high spin) units, we show the photoswitched transformation from a paramagnetic state to an antiferromagnetic ordered SCM state and the thermally induced reverse transformation, thus providing an effective way to control the spin topology of the SCM via light or a thermally induced metal-to-metal charge transfer.

[1]  M. Yamashita,et al.  Three-dimensional antiferromagnetic order of single-chain magnets: a new approach to design molecule-based magnets. , 2010, Chemistry.

[2]  J. Long,et al.  [ReCl4(CN)2]2-: a high magnetic anisotropy building unit giving rise to the single-chain magnets (DMF)4MReCl4(CN)2 (M = Mn, Fe, Co, Ni). , 2010, Journal of the American Chemical Society.

[3]  M. Yamashita,et al.  Coordination assemblies of [Mn4] single-molecule magnets linked by photochromic ligands: photochemical control of the magnetic properties. , 2009, Journal of the American Chemical Society.

[4]  W. Wernsdorfer,et al.  Realization of a magnet using an antiferromagnetic phase of single-chain magnets. , 2009, Physical review letters.

[5]  M. Yamashita,et al.  Slow dynamics of the magnetization in one-dimensional coordination polymers: single-chain magnets. , 2009, Inorganic chemistry.

[6]  Tomoyuki Matsuda,et al.  Crystal Structure, Charge-Transfer-Induced Spin Transition, and Photoreversible Magnetism in a Cyano-Bridged Cobalt−Tungstate Bimetallic Assembly , 2008 .

[7]  R. Clérac,et al.  Magnetic and optical bistability driven by thermally and photoinduced intramolecular electron transfer in a molecular cobalt-iron prussian blue analogue. , 2008, Journal of the American Chemical Society.

[8]  O. Sato,et al.  Control of magnetic properties through external stimuli. , 2007, Angewandte Chemie.

[9]  F. Varret,et al.  Photoinduced ferrimagnetic systems in Prussian blue analogues C(I)xCo4[Fe(CN)6]y (C(I) = alkali cation). 3. Control of the photo- and thermally induced electron transfer by the [Fe(CN)6] vacancies in cesium derivatives. , 2001, Journal of the American Chemical Society.

[10]  A. Caneschi,et al.  Cobalt(II)-Nitronyl Nitroxide Chains as Molecular Magnetic Nanowires The financial support of Italian MURST and CNR and of Brazilian CNPq and FUJB is acknowledged. The support from the European Community through the TMR program 3MD (contract no ERB4061PL97-0197) is also acknowledged. , 2001, Angewandte Chemie.

[11]  Arnold L. Rheingold,et al.  Reduced Anionic Mn12 Molecules with Half-Integer Ground States as Single-Molecule Magnets , 1999 .