Solid State Optical Properties of 4-Alkoxy-pyridine Butadiene Derivatives: Reversible Thermal Switching of Luminescence
Solid State Optical Properties of 4-Alkoxy-pyridine Butadiene Derivatives: Reversible Thermal Switching of Luminescence
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DOI：
10.1021/jp800298b
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发表时间：
2008-05
影响因子：
3.7
通讯作者：
N. S. S. Kumar-N.-S.-S.-Kumar-2107468207;S. Varghese;N. Rath;Suresh Das
中科院分区：
文献类型：
--
作者：
N. S. S. Kumar-N.-S.-S.-Kumar-2107468207;S. Varghese;N. Rath;Suresh Das
本文报道了一系列烷氧基苯基吡啶基丁二烯衍生物的合成及其在溶液和固体中的光学性质。所有衍生物在溶液中几乎无荧光，但在固态下显示出良好的荧光。通过研究这些分子的X射线晶体结构，研究了分子堆积在控制固态荧光中的作用。其中一种衍生物4-（（1 E，3E）-4-（4-丁氧基苯基）丁-1，3-二烯基）吡啶表现出多晶型，不同的多晶型物表现出视觉上可区分的荧光。在自然状态下，它以呈现蓝色荧光的多晶型物存在，而它的冷却熔体发出黄色光。这种差异可能是由于在分子包装的材料从人字形的砖石安排，导致从单体的J-型聚集体荧光的变化的转换。该多晶型物具有较好的稳定性（>6个月），但可在一定条件下转化为黄色荧光。
The synthesis and optical properties of a series of alkoxyphenyl-pyridyl butadiene derivatives in solution and in the solid state are described. All the derivatives were practically nonfluorescent in solution but showed good fluorescence in the solid-state. The role of molecular packing in controlling the solid-state fluorescence was investigated by studying the X-ray crystal structure of these molecules. One of the derivatives, 4-((1E,3E)-4-(4-butoxyphenyl)buta-1,3-dienyl)pyridine exhibited polymorphism, with the different polymorphs exhibiting visually distinguishable fluorescence. In the natural state it existed as a polymorph exhibiting blue fluorescence, while it’s cooled melt emitted yellow light. The difference could be attributed to a transformation in the molecular packing of the material from a herringbone to a brickstone arrangement, resulting in a change from monomer to J-type aggregate fluorescence. The polymorph exhibiting yellow fluorescence was fairly stable (>6 months) but could be conver...