日本結晶成長学会誌
Online ISSN : 2187-8366
Print ISSN : 0385-6275
ISSN-L : 0385-6275
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選択された号の論文の9件中1~9を表示しています
特集:「有機結晶材料の新展開」
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  • 永井 邑樹, 君塚 信夫
    2021 年 48 巻 2 号 48-2-01
    発行日: 2021年
    公開日: 2021/07/31
    ジャーナル 認証あり

      Photoinduced phase transition phenomena displayed by organic photochromic compounds have attracted a great deal of recent attention for their application to functional materials. Photoinduced ionic crystal-to-ionic liquid phase transition was demonstrated for ionic azobenzene derivatives, which allowed high-density storage of photon energy as conformational energy in the liquid cis-isomer. It was discharged in the course of cis-to-trans thermal isomerization and succeeding crystallization of the trans-isomer. Reversible, photoinduced liquefaction was observed for a nonionic, methoxy derivative of arylazopyrazole as well. Notably, this arylazopyrazole molecule spontaneously forms polar crystals, and its photoinduced phase transition allowed optical switching of second harmonic generation. Besides, macroscopically oriented, large-area thin films of the polar crystal were obtained at the air-water interface by photoillumination of the aqueous cis-isomer.

解説
  • 鈴木 凌, 橘 勝
    2021 年 48 巻 2 号 48-2-02
    発行日: 2021年
    公開日: 2021/07/31
    ジャーナル 認証あり

      Nano/microcrystals of fullerenes such as C60 and C70 have attracted significant interest for their unique morphologies and properties. Solvated fullerene crystals with various morphologies called nanowhiskers, nanosheets, nanowires, nanorods, nanoballs, nanocubes etc. have been grown by various solution methods. A liquid-liquid interfacial precipitation (LLIP) method, using a mixture of solvents consisting of a good solvent and a poor solvent, shows great potential in the morphology control of the solvated crystals because of its facileness and versatility. The solvents play a crucial role in the control of the morphology and crystal structure with the physical properties. The subtle variation of the solvent type or solvent ratio can remarkably change the morphological and properties of the products. Recently, we found unique changes in the morphology and mechanical properties such as elastic properties in C60 nanocrystals grown by the LLIP method. In this review, we show the LLIP method and our recent results on the morphology transformation in C60 nanosheets and large elastic deformation in C60 nanowhiskers.

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  • 山本 俊介
    2021 年 48 巻 2 号 48-2-04
    発行日: 2021年
    公開日: 2021/07/31
    ジャーナル 認証あり

    Metal−organic frameworks (MOFs) / Porous coordination polymers (PCPs) have attracted considerable interest for molecule separation, gas storage, and sensing because of their specific structural properties such as regulated surface areas and large pore volumes. A key aspect of MOF studies is control of MOF construction in terms of geometry, crystallinity, and crystal faces. Recently, integration with MOFs and other materials has been studied for thin-film device applications. This article focuses on the preparation methods of MOF as films especially on surface-mounted MOFs (SURMOFs). The SURMOFs were prepared on self-assembled monolayers (SAMs) in early studies whereas recent studies have been paving the way for MOF growth directly on amorphous polymer surface. The applications of these MOF films were also discussed in terms of optoelectronic applications to show the excellence of MOF films as organic-inorganic hybrid functional materials.

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