The University of Osaka · Materials Science
Professor Shuichi Suzuki's research lab specializes in the design and characterization of organic and organometallic materials with unique electronic and magnetic properties. Key research directions include the synthesis and spectroscopic investigation of stable organic radicals, diradicals, and charge-separated states in molecular systems, with a focus on spin-coupling phenomena, electron transfer processes, and long-lived charge-separated states. The lab employs advanced analytical techniques such as EPR, NMR, MS, and UV/Vis spectroscopy to probe electronic structures and dynamics in solution and solid states, particularly in systems with extended π-conjugation and tailored symmetry. Their work contributes significantly to the development of functional materials for molecular electronics, artificial photosynthesis, and spintronics.
Figures are computed from collected data and may differ slightly.
We have demonstrated the first MS and NMR observation of a face-to-face pi-bonded dimer of an organic radical (pancake-bonded dimer coined by R. S. Mulliken) in solution, using tri-tert-butylated phenalenyl radical 1, a 3-fold symmetric neutral hydrocarbon. In addition to the direct detection of the dimer signal by cold-spray ionization mass spectrometry (CSI-MS), 1H and 13C NMR spectra in solution gave definitive evidence of a well-defined D3d dimer structure with a 12-center-2-electron-long C-
We report a highly efficient charge separation system, D-Pt-A, where D (triphenylamine) and A (naphthalenediimide) are bonded to the Pt moiety through highly twisted phenylene ethynylene linkages. The quantum yields for the formation of the charge-separated state were determined to be nearly unity. The lifetimes of D(+)-Pt-A(-) were approximately 1 micros at room temperature and much longer at low temperature. The spin-correlated radical ion pair was directly observed by means of time-resolved E
We report on the highly compact nitroxide-substituted nitronyl nitroxide 1 and iminonitroxide 2; they have isoelectronic structures with trimethylenemethane. These diradicals are stable under aerated conditions at room temperature and have large positive exchange interactions: J/k(B) = +390 K (H = -2JS(1)(/)(2)·S(1/2)) for 1 and J/k(B) ≈ +550 K for 2.
Spin-state conversion: Oxidation of trinitroxide-trioxytriphenylamine introduces extended π conjugation, resulting in a ground-state spin conversion from the antiferromagnetic coupling in the neutral spin-doublet state to the ferromagnetic coupling in the cation spin-triplet state. The reversible conversion between the two states was confirmed by a change in the UV/Vis absorption under electrochemical oxidative/reductive conditions. Detailed facts of importance to specialist readers are publishe
The recently reported efficient charge-separated system based on bipyridine-diacetylide platinum(ii) complexes was applied to photoelectric conversion systems herein, based on the design and synthesis of two triads: MTA-Pt-NDISAc (3, MTA: dimethoxytriphenylamine, Pt: platinum(ii) complex, NDISAc: thioacetate derivative linked to naphthalenediimide) and MTA-Pt-MNICOOH (4, MNICOOH: naphthaleneimide-4-carboxylic acid). The charge-separated (CS) states of triads 3 and 5 (MOM-protected 4) were effect
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