Molecular Science
Online ISSN : 1881-8404
4 巻 , 1 号
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  • 長谷川 淳也
    2010 年 4 巻 1 号 p. A0031
    発行日: 2010年
    公開日: 2010/08/26
    ジャーナル フリー
    In visual systems and fluorescent proteins, controlling the photo-absorption/emission energy (color tuning) of the chromophore is the essentials to furnish a protein with the photo-functionality. Depending on the protein environment, the chromophores show a variety of colors, which are relevant to the character of the excited states and to the interactions between the chromophore and the environment. Here we summarize our recent studies on the spectral tuning mechanism of the human visual cone pigments and the fluorescent proteins. These studies elucidated a common feature in the color tuning, which also suggests a strategy to artificially control the color of proteins. We also explain our recent progress in developing the symmetry-adapted cluster-configuration interaction (SAC-CI) method and hybrid quantum mechanical/molecular mechanical (QM/MM) method particularly for studying the photo-functional proteins.
  • 山本 浩史
    2010 年 4 巻 1 号 p. A0032
    発行日: 2010年
    公開日: 2010/08/31
    ジャーナル フリー
    Two novel electronics based on molecular conductors are discussed. One is a crystalline supramolecular nanowire comprising conducting cation-radical molecules and halogen-bonded insulating networks. The way to utilize this nanowire for nano-size wiring in high-density memory is proposed. The other is a field effect transistor with highly correlated electrons on the conducting molecules. The Mott insulating state of organic interface is transformed into a metallic-like state by electrostatic doping, or band-filling control due to the capacitive effect of the transistor configuration. The Mott-transition transistor can be a new type of transistor driven by a phase transition.