A Diarylethene Cocrystal that Converts Light into Mechanical Work
A Diarylethene Cocrystal that Converts Light into Mechanical Work
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DOI：
10.1021/ja105356w
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发表时间：
2010-10-13
影响因子：
15
通讯作者：
Irie, Masahiro
中科院分区：
文献类型：
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作者：
Morimoto, Masakazu;Irie, Masahiro
研究了由光致变色二乙烯衍生物、1,2-二（2-甲基-5-（1-萘基）-3-噻吩基）全氟环戊烯（10）和全氟萘（FN）组成的矩形板双组分共晶的光力学效应。10的水晶。长度为1-5 mm的FN在紫外线和可见光交替照射下表现出可逆的弯曲运动。可逆弯曲可重复250次以上。原位x射线晶体分析表明，晶体的变形是由于二乙基乙烯分子在光环化时的形状变化引起的单元胞b轴的伸长，b轴与板晶的长轴相对应。在4.7 K时也观察到晶体的弯曲运动，并且对弯曲的动态测量证明了晶体在低温下发生了微秒级的各向异性膨胀。分子晶体悬臂梁由10。FN可以在紫外线照射下举起比晶体重200-600倍的金属球。紫外线照射产生的最大应力估计为44 MPa，是肌肉的100倍（类似于0.3 MPa），与压电晶体，如锆钛酸铅（PZT）（类似于50 MPa）相当。
The photomechancial effect of a rectangular plate two-component cocrystal composed of a photochromic diarylethene derivative, 1,2-bis(2-methyl-5-(1-naphthyl)-3-thienyl)perfluorocyclopentene (1o), and perfluoronaphthalene (FN) has been examined. The crystal of 1o.FN with the size of 1-5 mm in length exhibits reversible bending motion upon alternate irradiation with ultraviolet (UV) and visible light. The reversible bending could be repeated over 250 times. In situ X-ray crystallographic analysis revealed that the deformation of the crystal is due to the elongation of the b-axis of the unit cell, which corresponds to the long axis of the plate crystal, induced by the shape change of component diarylethene molecules upon photocyclization. The bending motion was observed even at 4.7 K, and dynamic measurement of the bending proved that the anisotropic expansion of the crystal takes place in the microsecond time scale at the low temperature. Molecular crystal cantilevers made of 1o.FN can lift metal balls, the weight of which is 200-600 times heavier than the weight of the crystal, upon UV irradiation. The maximum stress generated by UV irradiation was estimated to be 44 MPa, which is 100 times larger than that of muscles (similar to 0.3 MPa) and comparable to that of piezoelectric crystals, such as lead zirconate titanate (PZT) (similar to 50 MPa).