Abstract
Cyanide-bridged Fe-Co complex [Fe(Tp)(CN)3]2Co(bpe)⋅5H2O (1⋅5H2O; Tp = hydro-tris(pyrazolyl)borate; bpe = 1,2-bis(4-pyridyl)ethane) shows temperature- and light- induced metal-to-metal charge transfer (MMCT) involving spin state changes between magnetic \(\mathrm{Fe}^{\mathrm{III}}_{\phantom{\mathrm{III}}\mathrm{LS}}\mbox{--}\mathrm{Co}^{\mathrm{II}}_{\phantom{\mathrm{II}}\mathrm{HS}}\) (HS = high spin, LS = low spin) state and nonmagnetic \(\mathrm{Fe}^{\mathrm{II}}_{\phantom{\mathrm{II}}\mathrm{LS}}\mbox{--}\mathrm{Co}^{\mathrm{III}}_{\phantom{\mathrm{III}}\mathrm{LS}}\) state, while the dehydrated material 1 does not show any MMCT and holds \(\mathrm{Fe}^{\mathrm{III}}_{\phantom{\mathrm{III}}\mathrm{LS}}\mbox{--}\mathrm{Co}^{\mathrm{II}}_{\phantom{\mathrm{II}}\mathrm{HS}}\) state. We have investigated the magnetic properties of each spin state in 1 and 1⋅5H2O by means of magnetization and ESR measurement under pulsed high magnetic field. At low temperature below T N, in both 1 and 1⋅5H2O, the saturation magnetization in the induced ferromagnetic phase is well explained by S and g values derived from the magnetic susceptibility study. In the ESR of 1, we observed characteristic modes corresponding to a spin excitation in the induced ferromagnetic phase where its temperature dependence shows an evolution of spin correlation in the \(\mathrm{Fe}^{\mathrm{III}}_{\phantom{\mathrm{III}}\mathrm{LS}}\mbox{--}\mathrm{Co}^{\mathrm{II}}_{\phantom{\mathrm{II}}\mathrm{HS}}\) state at low temperature. We further found that the similar ESR modes grow in the light-induced state of 1⋅5H2O. The results strongly suggest that the light-induced magnetization in 1⋅5H2O is driven by a light-induced MMCT, which involves transition of spin multiplicity from the nonmagnetic \(\mathrm{Fe}^{\mathrm{II}}_{\phantom{\mathrm{II}}\mathrm{LS}}\mbox{--}\mathrm{Co}^{\mathrm{III}}_{\phantom{\mathrm{III}}\mathrm{LS}}\) to the magnetic \(\mathrm{Fe}^{\mathrm{III}}_{\phantom{\mathrm{III}}\mathrm{LS}}\mbox{--}\mathrm{Co}^{\mathrm{II}}_{\phantom{\mathrm{\mathrm{II}}}\mathrm{HS}}\) pair.
Similar content being viewed by others
References
O. Sato, J. Tao, Y.-Z. Zhang, Angew. Chem., Int. Ed. Engl. 46, 2152 (2007)
M.B. Duriska, S.M. Neville, B. Moubaraki, J.D. Cashion, G.J. Halder, K.W. Chapman, C. Balde, J.-F. Létard, K.S. Murray, C.J. Kepert, S.R. Batten, Angew. Chem., Int. Ed. Engl. 48, 2549 (2009)
M. Ohba, K. Yoneda, G. Agustí, M.C. Muñoz, A.B. Gaspar, J.A. Real, M. Yamasaki, H. Ando, Y. Nakao, S. Sakaki, S. Kitagawa, Angew. Chem., Int. Ed. Engl. 48, 4767 (2009)
O. Sato, T. Iyoda, A. Fujishima, K. Hashimoto, Science 272, 704 (1996)
S.-i. Ohkoshi, Y. Hamada, T. Matsuda, Y. Tsunobuchi, H. Tokoro, Chem. Mater. 20, 3048 (2008)
M.G. Hilfiger, M. Chen, T.V. Brinzari, T.M. Nocera, M. Shatruk, D.T. Petasis, J.L. Musfeldt, C. Achim, K.R. Dunbar, Angew. Chem., Int. Ed. Engl. 49, 1410 (2010)
V. Escax, G. Champion, M.-A. Arrio, M. Zacchigna, C.C.d. Moulin, A. Bleuzen, Angew. Chem., Int. Ed. Engl. 44, 4798 (2005)
O. Sato, Y. Einaga, A. Fujishima, K. Hashimoto, Inorg. Chem. 38, 4405 (1999)
Y. Moritomo, F. Nakada, H. Kamioka, Phys. Rev. B 75, 214110 (2007)
T. Liu, Y.-J. Zhang, S. Kanegawa, O. Sato, Angew. Chem., Int. Ed. Engl. 49, 8645 (2010)
L.M. Toma, R. Lescouëzec, J. Pasán, C. Ruiz-Pérez, J. Vaissermann, J. Cano, R. Carrasco, W. Wernsdorfer, F. Lloret, M. Julve, J. Am. Chem. Soc. 128, 4842 (2006)
H.-R. Wen, C.-F. Wang, Y. Song, S. Gao, J.-L. Zuo, X.-Z. You, Inorg. Chem. 45, 8942 (2006)
R. Lescouëzec, J. Vaissermann, C. Ruiz-Pérez, F. Lloret, R. Carasco, M. Julve, M. Verdaguer, Y. Dromzee, D. Gatteschi, W. Wernsdorfer, Angew. Chem. 115, 1521 (2003)
Acknowledgements
This work was partly supported by the Center for Integrated Nanotechnology Support at Tohoku University and also by “Nanotechnology Network Project” of the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of the Japanese Government.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Yoshii, S., Nojiri, H. & Sato, O. High-field ESR on Light-Induced Transition of Spin Multiplicity in FeCo Complex. J Low Temp Phys 170, 383–388 (2013). https://doi.org/10.1007/s10909-012-0793-2
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10909-012-0793-2