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首页> 外文期刊>Journal of Materials Chemistry, C. materials for optical and electronic devices >A durable and fast-responsive photochromic and switchable luminescent polyviologen-polyoxometalate hybrid
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A durable and fast-responsive photochromic and switchable luminescent polyviologen-polyoxometalate hybrid

机译：耐用且响应迅速的光致变色和可切换的发光聚紫精-多金属氧酸盐混合物

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A novel photochromic and luminescent switchable hybrid of [(AV(2+))(p-AV)(EuW10O36)](n)center dot 2nH(2)O (1; AV(2+) = N,N'-bisaminopropyl-4,4'-bipyridinium bromide hydrobromide; p-AV = poly(1-ethyl-1'-butyl-4,4'-bipyridinium)) has been synthesized by combining a fluorescent POM with monomeric and in situ generated polymerized viologen molecules. Photochromic transformation of 1 from colorless to dark blue under UV-irradiation was observed due to its in situ generated polymeric viologen units, in which the coloration and decoloration time were both lower than 10 minutes. Especially, the decoloration process can be easily realized by exposure of 1 to humid air (95% relative humidity) within 5 minutes, which allows 1 to be used as a potential humidity sensitive material. The reversible coloration and decoloration process can be repeated for more than 40 cycles, which makes 1 an intriguing stable inorganic-viologen-based photochromic hybrid. Intermolecular fluorescence resonance energy transfer (FRET) from inorganic polyoxoanions to the organic photochromic component was observed and was responsible for the modulation of the red emission of 1 to its quenching state when it was under UV-irradiation. The photochromism and photomodulated fluorescence of 1 opens a new avenue for developing durable and quick-responsive smart optical materials based on polyoxometalate and viologen.
机译：[（AV（2 +））（p-AV）（EuW10O36）]（n）中心点2nH（2）O（1; AV（2+）= N，N'-双氨基丙基-4,4'-溴化吡啶鎓氢溴酸盐; p-AV =聚（1-乙基-1'-丁基-4,4'-联吡啶鎓））是通过将荧光POM与单体和原位生成的聚合紫精分子结合而合成的。由于其原位产生的聚合物紫精单元，其在着色和脱色时间均低于10分钟的情况下，在紫外线照射下观察到从无色到深蓝色的1的光致变色转变。尤其是，可以通过在1分钟内将1暴露于潮湿空气（相对湿度95％）中5分钟来轻松实现脱色过程，从而使1可用作潜在的湿度敏感材料。可逆的着色和脱色过程可以重复进行40个以上的循环，这使1成为一种有趣的稳定的基于无机-紫精的光致变色杂化材料。观察到从无机多氧阴离子到有机光致变色组分的分子间荧光共振能量转移（FRET），并导致其在紫外线照射下将红色发射1调节为猝灭状态。 1的光致变色和光调制荧光为开发基于多金属氧酸盐和紫精的耐用且快速响应的智能光学材料开辟了一条新途径。

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