ON/OFF Red Emission from Azaporphine in a Coordination Cage in Water
ON/OFF Red Emission from Azaporphine in a Coordination Cage in Water
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DOI：
10.1021/ja904875y
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发表时间：
2009-09-09
影响因子：
15
通讯作者：
Fujita, Makoto
中科院分区：
文献类型：
--
作者：
Ono, Kosuke;Klosterman, Jeremy K.;Fujita, Makoto
红色发光分子作为化学传感器、生物标签和新的光源材料具有重要的应用，但受到溶解性和形成非发光聚集体的倾向的严重限制。在这里，我们提出了一个不寻常的例子，其中的协调笼螯合和保持红色发射性能的四氮杂啡（TAP）在水溶液中。此外，高度阳离子宿主内的封装降低了TAP内部质子的pK（a），导致形成酸/碱开/关荧光开关。
Red-emissive molecules have important applications as chemosensors, biological tags, and new light source materials but are severely limited by solubility and the tendency to form nonemissive aggregrates. Here we present an unusual example where a coordination cage sequesters and maintains the red-emissive properties of tetraazaporphine (TAP) in aqueous solution. Additionally, encapsulation within the highly cationic host lowers the pK(a) of the TAP interior protons, leading to the formation of an acid/base ON/OFF fluorescent switch.