Solid-State physical chemistry based on metal-complexes and coordination compounds.
Design of conducting/magnetic functional materials based on metal complexes
Development of soft-materials conducting ferromagnets aimed at achieving molecular spintronics
Design of new molecular nano-sized magnets
Development of multi-redox systems in molecular condensed systems
Design of redox-active porous molecular materials and host-guest chemistry for controlling electron conducting and magnetic correlation
Design of metal-complex-based electrodes toward the development of high-performance secondary cells
Overview of Research
We are studying on solid-state physical chemistry based on metal complexes or coordination compounds, in which our goal is directed to control synergistically electronic and magnetic properties/behavior on molecular frameworks and finally to create new soft molecular materials with unique phenomena. The techniques of crystal engineering or molecular self-assembling with metal complexes enables us to create diverse molecular frameworks and supramolecular architectures. Of course, many of metal complexes have such traits as high redox activity, high charge-transfer activity between metal ion and ligands, and paramagnetism with a large anisotropy controllable by ligand-fields around metal ion chosen. We will be able to tune these characteristics and design “functional” and “dynamical” molecular frameworks as if they were simply constructed by Lego blocks. “Molecules” including metal complexes have the high design performance and flexibility in their type diversity, so it is our new challenge to manipulate on-demand electrons/spins on multi-dimensional frameworks constructed by metal complexes.
W. Kosaka, K. Yamagishi, J. Zhang, H. Miyasaka, “Gate-Opening Gas Adsorption and Host-Guest Interacting Gas Trapping Behavior of Porous Coordination Polymers under Applied AC Electric Fields,” J. Am. Chem. Soc., 136, 12304–12313 (2014).
H. Miyasaka, “Control of Charge Transfer in Donor/Acceptor Metal–Organic Frameworks,”Acc. Chem. Res.,46, 248–257 (2013).
M. Nishio, N. Hoshino, W. Kosaka, T. Akutagawa, H. Miyasaka, “Carrier Concentration Dependent Conduction in Insulator-Doped Donor/Acceptor Chain Compounds,” J. Am. Chem. Soc.,135, 17715-17718 (2013).
W. Kosaka, K. Yamagishi, A. Hori, H. Sato, R. Matsuda, S. Kitagawa, M. Takata, H. Miyasaka, “Selective NO Trapping in the Pores of Chain-Type Complex Assemblies Based on Electronically Activated Paddlewheel-Type [Ru2II,II]/[Rh2II,II] Dimers,” J. Am. Chem. Soc.,135, 18469-18480 (2013).
H. Miyasaka, N. Motokawa, T. Chiyo, M. Takemura, M. Yamashita, H. Sagayama, and T. Arima, “Stepwise Neutral-Ionic Phase Transitions in a Covalently-Bonded Donor/Acceptor Chain Compound,” J. Am. Chem. Soc., 133, 5338–5345 (2011).
H. Miyasaka, N. Motokawa, S. Matsunaga, M. Yamashita, K. Sugimoto, T. Mori, N. Toyota, and K. R. Dunbar, “The Control of Charge-Transfer in a Series of Ru2II,II/TCNQ Two-Dimensional Networks by Tuning the Electron-Affinity of TCNQ Units: A Route to Synergistic Magnetic/Conducting Materials”, J. Am. Chem. Soc.,132, 1532–1544 (2010).
N. Motokawa, S. Matsunaga, S. Takaishi, H. Miyasaka, M. Yamashita, K. R. Dunbar, “Reversible Magnetism between an Antiferromagnet and a Ferromagnet Related to Solvation/Desolvation in a Robust Layered [Ru2]2TCNQ Charge-Transfer System,” J. Am. Chem. Soc., 132, 11943–11951 (2010).
R. Clérac, H. Miyasaka, M. Yamashita, C. Coulon, “Evidence for Single Chain Magnet Behavior in a MnIII-NiII Chain Desighed with High Spin Magnetic Units: A Route to High Temperature Metastable Magnets,” J. Am. Chem. Soc.,124, 12837-12844 (2002).