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首页> 外文期刊>Journal of Materials Chemistry, C. materials for optical and electronic devices >The photomechanic effects of the molecular crystals based on 5-chloro-2-(naphthalenylvinyl)benzoxazols fueled by topo-photochemical reactions
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The photomechanic effects of the molecular crystals based on 5-chloro-2-(naphthalenylvinyl)benzoxazols fueled by topo-photochemical reactions

机译：基于5-氯-2-（萘基乙烯基）苯并恶唑的分子晶体的光学对效应通过Topo-Phercence反应燃料

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摘要

The photo-reactive 5-chloro-2-(naphthalenylvinyl)benzo[d]oxazols (BOV1N, BOV1NF, BOV1NM, BOV2N, and BOV2NM) have been prepared. Interestingly, their molecular crystals exhibit significant photomechanic effects and the H-1 NMR spectral changes for the microcrystals before and after UV irradiation suggest that photodimerization is the driving force for the light-induced macroscopic mechanic movements. The needle-like crystals of BOV1N bend away from the UV light upon irradiation for several seconds. Such rapid elastic deformation could be repeated several times. It should be noted that -type and -type cyclobutane derivatives D-BOV1N (the dimer of BOV1N) are afforded as the main product and byproduct, respectively, after the microcrystals were exposed to 365 nm light for 5 min. Since the photo-induced [2+2] cycloaddition shortens the distance of the olefin pairs and makes the terminal units stretch outside the molecular long axle, the strain in the phototropic surface of the crystal can be yielded and accumulated. The release of the accumulated strain leads to the bending of the needle-like crystals backwards to the UV light. Thus, it was reasonable that the thinner fibers exhibited more rapid and significant movements on account of the high topo-photochemical reaction efficiency. The molecular crystals of BOV1NF, BOV2N, and BOV2NM exhibited similar photomechanic effects. We also found that the UV irradiation parallel to the long axis of crystals would not drive the crystals to move. On the contrary, the light-induced slipping and swinging of the needle-like crystal of BOV1NM is observed due to the low dimerization efficiency. Thus, the molecular crystals based on the naphthylvinylbenzoxazole derivatives become new platforms for the efficient light-mechanical energy conversion.
机译：已经制备了光反应5-氯-2-（萘基乙烯基）苯并[D]恶唑（BoV1N，BoV1NF，BoV1nm，BoV2N和BoV2nm）。有趣的是，它们的分子晶体表现出显着的光电力学效应和UV辐射前后微晶的H-1 NMR光谱变化表明光电二聚体是光致宏观机械运动的驱动力。 BoV1N的针状晶体在照射时从UV光弯曲几秒钟。这种快速的弹性变形可以重复几次。应当注意，在微晶暴露于365nm光5分钟后，分别是主要产物和副产物的-TTYPE和型环丁烷衍生物D-BoV1N（BoV1N二聚体）作为主要产物和副产物。由于光诱导的[2 + 2]环加成缩短了烯烃对的距离，并且使端子单元在分子长轴外延伸展，因此可以产生和积累晶体的光致表面中的应变。累积应变的释放导致针状晶体向后弯曲到UV光。因此，较薄的纤维是合理的，较薄的纤维由于高热量的光化学反应效率而言表现出更快速和显着的运动。 BoV1NF，BoV2N和BoV2NM的分子晶体表现出类似的光电力学效应。我们还发现平行于长轴的紫外线照射不会驱动晶体移动。相反，由于低二聚体效率，观察到BoV1nm的针状晶体的光引起的滑动和摆动。因此，基于萘基苯基苯并恶唑衍生物的分子晶体成为有效的光学能量转换的新平台。

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