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Photoluminescence by Intercalation of a Fluorescent β-Diketone Dye into a Layered Silicate
Langmuir ( IF 3.7 ) Pub Date : 2017-11-16 00:00:00 , DOI: 10.1021/acs.langmuir.7b03460 Mutsumi Hirose 1 , Fuyuki Ito 2 , Tetsuya Shimada 3 , Shinsuke Takagi 3 , Ryo Sasai 4 , Tomohiko Okada 1
Langmuir ( IF 3.7 ) Pub Date : 2017-11-16 00:00:00 , DOI: 10.1021/acs.langmuir.7b03460 Mutsumi Hirose 1 , Fuyuki Ito 2 , Tetsuya Shimada 3 , Shinsuke Takagi 3 , Ryo Sasai 4 , Tomohiko Okada 1
Affiliation
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A β-diketone dye was packed into the two-dimensional nanospace of a synthetic smectite (Sumecton SA), which is a cation-exchangeable layered silicate, to induce strong emission owing to molecular packing of the dye. An emissive dye, 1-(4-methoxyphenyl)-3-(4-pyridyl)-1,3-propandione, was prepared through a Claisen condensation reaction; the dye exhibited aggregation-induced emission, which is enhanced emission owing to clustering of molecules to form aggregates in poor solvents or in the solid state. The dye was nonemissive in solution. However, strong green emission was observed because of the restriction of molecular motion when the protonated dye was accommodated into the interlayer nanospace of the silicate layers through cation-exchange reactions. The restricted motion was confirmed by the smaller nonradiative relaxation rate constant obtained by time-resolved luminescence and quantum yield measurements. A moderate dye packing (0.11 mmol/g) in the interlayer space is important to obtain enhanced emission, whereas the intercalation of a large amount of dye (0.27 mmol/g) resulted in concentration quenching. Therefore, the interlayer space of the layered silicate used here was responsible for the strong emission because of moderate packing of the accommodated β-diketones.
中文翻译：
通过将荧光β-二酮染料嵌入层状硅酸盐中来进行光致发光
将β-二酮染料填充到合成绿土（Sumecton SA）的二维纳米空间中，后者是一种阳离子可交换的层状硅酸盐，由于染料的分子堆积而引起强烈的发射。通过克莱森缩合反应制备了发光染料1-（4-甲氧基苯基）-3-（4-吡啶基）-1,3-丙二酮。染料表现出聚集诱导的发射，由于分子聚集在不良溶剂或固态下形成聚集体，因此发射增强。染料在溶液中不发光。然而，由于通过阳离子交换反应将质子化的染料容纳在硅酸盐层的层间纳米空间中时，由于分子运动的限制，观察到强烈的绿色发射。通过时间分辨的发光和量子产率测量获得的较小的非辐射弛豫速率常数证实了运动受限。在层间空间中适度的染料堆积（0.11 mmol / g）对于获得增强的发射很重要，而大量染料（0.27 mmol / g）的插入导致浓度猝灭。因此，由于所容纳的β-二酮的适度堆积，在此使用的层状硅酸盐的层间空间是强发射的原因。
更新日期：2017-11-16
中文翻译：
通过将荧光β-二酮染料嵌入层状硅酸盐中来进行光致发光
将β-二酮染料填充到合成绿土（Sumecton SA）的二维纳米空间中，后者是一种阳离子可交换的层状硅酸盐，由于染料的分子堆积而引起强烈的发射。通过克莱森缩合反应制备了发光染料1-（4-甲氧基苯基）-3-（4-吡啶基）-1,3-丙二酮。染料表现出聚集诱导的发射，由于分子聚集在不良溶剂或固态下形成聚集体，因此发射增强。染料在溶液中不发光。然而，由于通过阳离子交换反应将质子化的染料容纳在硅酸盐层的层间纳米空间中时，由于分子运动的限制，观察到强烈的绿色发射。通过时间分辨的发光和量子产率测量获得的较小的非辐射弛豫速率常数证实了运动受限。在层间空间中适度的染料堆积（0.11 mmol / g）对于获得增强的发射很重要，而大量染料（0.27 mmol / g）的插入导致浓度猝灭。因此，由于所容纳的β-二酮的适度堆积，在此使用的层状硅酸盐的层间空间是强发射的原因。
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