Publications (6)38.92 Total impact
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Article: Optical Nonlinearity in (EDT-DSDTFVO)2·FeBr4, an Intriguing Molecular Material with Metallic Conductivity, Magnetoresistance Effects, and Quadratic Nonlinear Optical Properties
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ABSTRACT: The quadratic ( E2) nonlinear optical (NLO) properties of (EDT-DSDTFVO)2·FeBr4 have been investigated: an efficiency equal to 3−6 times that of urea in second-harmonic generation at 1.907 μm has been observed by a powder test, and an effective (deff) nonlinear optical susceptibility (χ(2)) tensor component equal to 110 pm/V at 1.064 μm has been determined by confocal μ-SHG in the backscattering geometry. The origin of this effect is ascribable to the presence of strongly interacting EDT-DSDTFVO species organized in non-centrosymmetric stacks in solid state. A computational (ZINDO) investigation carried out on a [(EDT-DSDTFVO)4]2+ tetrameric entity at the fractional (ρ = 0.5) oxidation state leads to a static molecular hyperpolarizability (β0) equal to 854 × 10−30 cm5 esu−1 per tetrameric unit. (EDT-DSDTFVO)2·FeBr4 is the first multifunctional molecular material exhibiting simultaneously conducting, magnetic, and NLO effects. The possibilities of using such absorbent species as micrometer size materials with efficient NLO properties are thoroughly evaluated.11/2010; -
Article: An antiferromagnetic molecular metal based on a new bent-donor molecule.
Journal of the American Chemical Society 11/2007; 129(42):12618-9. · 9.91 Impact Factor -
Article: Weak ferromagnetism in a semiconducting (ethylenedithiodiselena- dithiafulvalenoquinone-1,3-diselenolemethide)2.FeBr4 salt.
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ABSTRACT: The 2:1 salts of a new bent donor molecule, ethylenedithiodiselenadithiafulvalenoquinone-1,3-diselenolemethide (EDT-DSDTFVODS) and either an FeBr(4)- or a GaBr(4)- ion exhibit semiconducting properties and had small activation energies. The Fe(III) d spins of the FeBr(4)- salt are initially subject to a strong antiferromagnetic interaction and afterward exhibited a weak ferromagnetism at 3.8 K with a very small remanent magnetization of ca. 4 x 10(-2) mu(B) and a spin-flop near 25 kOe along the intercolumnar direction.Inorganic Chemistry 11/2007; 46(21):8478-80. · 4.60 Impact Factor -
Article: A metallic (EDT-DSDTFVSDS)2.FeBr4 salt: antiferromagnetic ordering of d spins of FeBr4- ions and anomalous magnetoresistance due to preferential pi-d interaction.
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ABSTRACT: The 2:1 salt of a new donor molecule, EDT-DSDTFVSDS with FeBr4- ion, (EDT-DSDTFVSDS)2.FeBr4 showed an essentially metallic behavior despite a small upturn in the electrical resistance below ca. 30 K (electrical conductivities at 290 and 4.2 K are 200 and 170 S cm-1, respectively). The Fe(III) d spins of the FeBr4- ions in this salt were subject to antiferromagnetic ordering at 3.3 K by virtue of a strong pi-d interaction (Jpid) which is comparable to that in a molecular metallic conductor, lambda-(BETS)2.FeCl4, and of a very weak d-d interaction (Jdd). This strong pi-d interaction was evidenced by a large and negative magnetoresistance effect (ca. 20% at 5 T) as well as by the appearance of a large dip in the resistance at the magnetic field (ca. 2.0 T) parallel to the easy axis for the spin-flop transition of the Fe(III) d spins.Journal of the American Chemical Society 10/2006; 128(36):11746-7. · 9.91 Impact Factor -
Article: Magnetoresistance effects evidencing the pi-d interaction in metallic organic conductors, (EDT-DSDTFVO)2*MX4 (M = Fe, Ga; X = Cl, Br).
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ABSTRACT: The 2:1 salts of a new donor molecule, EDT-DSDTFVO with MX4- (M = Fe, Ga; X = Cl, Br) ions, were prepared. The crystal structures of the donor molecules had a beta-type packing motif. All the salts essentially exhibited metallic behaviors despite the small upturns in the resistances below 30-70 K. A large negative magnetoresistance (MR) effect [-14.7% (rho(perpendicular)) at 4.0 K and 5 T] was observed in the FeCl4- salt, while a positive MR effect [+4.0% (rho(perpendicular)) at 4.0 K and 5 T] was observed in the GaCl4- salt, suggesting that there is a pi-d interaction in the FeCl4- salt. The pressure application suppressed the resistivity upturns, increased the negative MR effect (-17.7% at 9.5 kbar) in the FeCl4- salt, and decreased the positive MR effect (+3.3% at 15 kbar) in the GaCl4- salt.Inorganic Chemistry 08/2006; 45(15):5712-4. · 4.60 Impact Factor -
Article: Stable metallic behavior and antiferromagnetic ordering of Fe(III) d spins in (EDO-TTFVO)2.FeCl4.
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ABSTRACT: We report the crystal structure and physical properties of the 2:1 FeCl4- salt of a new donor molecule, EDO-TTFVO. Crystal structure analysis of this salt revealed that the donor molecules formed a beta' '-type two-dimensional conducting layer, and there is a short S...Cl contact between the donor molecules and the FeCl4- ions, which is expected to mediate a strong pi-d interaction. This salt showed a stable metallic conducting behavior down to 0.3 K and an antiferromagnetic ordering at TN approximately 3.0 K, indicating that this salt becomes a new antiferromagnetic molecular metal at ambient pressure. The appearance of the magnetic ordering is considered to originate from the strong pi-d interactions between the donor molecules and the FeCl4- ions because the field dependence of magnetoresistances was remarkably affected below the antiferromagnetic transition temperature.Journal of the American Chemical Society 11/2005; 127(41):14166-7. · 9.91 Impact Factor
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Institutions
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2006–2007
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Osaka Prefecture University
- Graduate School of Science
Sakai, Osaka-fu, Japan
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