Development of Multifunctional Organic Materials (Superconductors, Spin Liquids, Novel Phase Transition Systems, etc)

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Systematic uniaxial strain study of κ-(BEDT-TTF)_2X revealed the relationship between the anisotropy of the triangular spin lattice and superconducting transition temperature. We discovered the spin liquid behavior in the Mott insulator κ-(BEDT-TTF)_2Cu_2(CN)_3 which has the nearly regular triangular spin lattice.We demonstrated the ultra-fast and highly efficient photo-induced metal-insulator transition system in (EDO-TTF)_2PF_6, where one photon converts ca. 500 molecules to highly conducting state within 1.5 ps. TP-EDOT, a new donor having thiopyrane and dithiol rings, gave a Mott insulator exhibiting a unique magnetic structure.A (C_<60>^-)_2 dimer bound by two C-C bonds was prepared for the first time in an ionic {(MDABCO^+)・Co^<II>TMPP}_<2・ (C_<60>^-)_2・(C_6H_4Cl_2)_<2.5>・(C_6H_5CN)_<1.5>, the magnetic behavior of which was interpreted by the singlet-triplet model. A reversible formation of a coordination Co-C(C_<60>^-) bond was found in {(MDABCO^+)・Co^<II>OEP・(C_<60>^-)}・ (C_6H_ … More 5CN)_χ・(C_6H_4Cl_2)_<1-χ>, The bond formation was accompanied by a paramagnetic-diamagnetic transition.1-Alkyl(C_nH_<2n+1>)-3-methylimidazolium (C_nMI) cations afforded 8 and 4 paramagnetic ionic liquids based on Fe^<III>X_4 (X : Cl, Br) anions and organic anions with TEMPO radical moiety, respectively. Au^I(CN)_2 salts composed of C_nMI cations having elongated alkyl chains (n 【greater than or equal】 4) emitted blue lights in liquid form at room temperature. Also, we obtained a new C_4MI salt formed with pyrene-based anion, which melts at 43 ℃ and exhibits a blue-green emission in the liquid state.We prepared indoline-TCNQ intramolecular charge transfer compounds having various substituents to establish the methodologies to control and estimate their charge transfer degree. Chemical modification on pyrimido-fused TTF derivatives yielded conductive single-component organic compounds. Complex formation between cytosine and TCNQ derivatives afforded charge transfer salts exhibiting self-assembled structures and high conductivity. Less