| 研究実績の概要 |
We succeeded in establishing for the first time reproducible synthetic procedures of phase-pure highly-crystalline metal-doped PAHs, which emerge as candidates of new exotic electronic states of matter, including three-dimensional quantum spin liquids arising purely from carbon pi-electrons for the first time. Our methodology led to entirely new chemical approaches to produce intercalated PAHs with controlled oxidation states. The new synthetic routes allowed the isolation of unique materials, including the isolation of a S = 1/2 quantum spin-liquid state arising for the first time purely from pi-electrons. These results provide the seeds of new ideas to transform thinking about the scientific area of quantum magnetism in molecular systems and open a new branch of molecular science in the same way that, 10 years ago, the discovery of the Cs3C60 superconductor led to the renaissance of fullerene superconductivity.
As a direct application of our generic synthetic routes, we have now developed the synthesis of the first unsolvated alkali metal rubrene and tetracene phases. The crystal chemistry of the potassium rubrene phase contrasts with that of earlier structures allowing us to take the first step towards establishing structure-composition relationships in this class of materials. On the other hand, K2tetracene is isostructural with K2pentacene with the K+ cations residing in two sites that are not disordered due to the limited sites on which they can be accommodated.
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