Programmable spin-state switching in a mixed-valence spin-crossover iron grid

Takuto Matsumoto, Graham N. Newton, Takuya Shiga, Shinya Hayami, Yuta Matsui, Hiroshi Okamoto, Reiji Kumai, Youichi Murakami and Hiroki Oshio ()
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Takuto Matsumoto: Graduate School of Pure and Applied Sciences, University of Tsukuba
Graham N. Newton: Graduate School of Pure and Applied Sciences, University of Tsukuba
Takuya Shiga: Graduate School of Pure and Applied Sciences, University of Tsukuba
Shinya Hayami: Graduate School of Science and Technology, Kumamoto University
Yuta Matsui: Graduate School of Frontier Sciences, The University of Tokyo
Hiroshi Okamoto: Graduate School of Frontier Sciences, The University of Tokyo
Reiji Kumai: Photon Factory and Condensed Matter Research Center, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
Youichi Murakami: Photon Factory and Condensed Matter Research Center, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
Hiroki Oshio: Graduate School of Pure and Applied Sciences, University of Tsukuba

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract Photo-switchable systems, such as discrete spin-crossover complexes and bulk iron–cobalt Prussian blue analogues, exhibit, at a given temperature, a bistability between low- and high-spin states, allowing the storage of binary data. Grouping different bistable chromophores in a molecular framework was postulated to generate a complex that could be site-selectively excited to access multiple electronic states under identical conditions. Here we report the synthesis and the thermal and light-induced phase transitions of a tetranuclear iron(II) grid-like complex and its two-electron oxidized equivalent. The heterovalent grid is thermally inactive but the spin states of its constituent metal ions are selectively switched using different laser stimuli, allowing the molecule to exist in three discrete phases. Site-selective photo-excitation, herein enabling one molecule to process ternary data, may have major ramifications in the development of future molecular memory storage technologies.

Date: 2014
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DOI: 10.1038/ncomms4865

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