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Coumarin-Rhodamine CR1 was synthesized by reaction of 7-diethylamino-2-oxo-2H-chromen-3-carboxylic chloride and N-(Rhodamine-6G)lactamethylenediamine and recrystallized from ethanol as yellow crystals. Single-crystal X-ray structural analysis confirms the coexistence of two fluorophores in CR1 , whereby the Rhodamine 6G moiety is in a luminescence-inactive ringclosed tautomeric form. Europium compound CR1-Eu (1) was prepared by refluxing ligand CR1 and [Eu(tta)3] in THF (tta=1,1,1-trifluoro-3-(2-thenoyl)acetone) and purified by recrystallization as an amorphous yellow powder. Elemental analysis and 1H NMR spectroscopic characterization suggest the chemical formula [Eu(tta)2(CR1)2](tta) for 1 . Fourier transform IR spectroscopic studies on 1 and CR1 showed a significant change in the stretching bands of the carbonyl group at 1699 and 1685 cm1, which suggests participation of the carbonyl groups in coordination to EuIII. Additionally, the ESI-MS spectrum of 1 (Supporting Information Figure S4) exhibited only one intense peak at m/z 1993.61, which was assigned to the [Eu(tta)2(CR1)2]+ cation according to the exact comparison of the intense peak with the simulation based on natural isotopic abundances, which indicates formation of complex 1 and its stability in solution. 化合物名称就不用翻译了 |
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inter_dudu(金币+15,VIP+0): 8-27 09:57
inter_dudu(金币+15,VIP+0): 8-27 09:57
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通过-diethylamino-2-oxo-2H-chromen-3-carboxylic chloride 和 N-(Rhodamine-6G)lactamethylenediamine之间的反应，并用乙醇进行重结晶合成得到黄色晶体Coumarin-Rhodamine CR1。 X-射线单晶结构分析确认了在CR1中两个荧光团的共存 。据此说明Rhodamine 6G基团是一个不发光的闭环异构体。通过分馏THF中的配位基 CR1和[Eu(tta)3]并进行重结晶而制备得到非结晶体黄色粉末的Europium compound CR1-Eu (1) 。通过元素分析和1H核磁共振光谱鉴定假设化学式 [Eu(tta)2(CR1)2](tta) 为1.对1和CR1通过傅里叶变换红外光谱的研究发现一个重大的变在1699 and 1685 cm1的羰基伸缩振动带上，这可能说明协调EuIII时有羰基的参与。而且1的电喷雾质谱（如图S4提供的信息）呈现出只有一个大峰在m/z 1993.61处,然后根据精确地以此大峰与基于天然同位素丰度的模拟峰进行比较，说明复合物1的形成及其在溶液中的稳定性，从而认为此峰为[Eu(tta)2(CR1)2]+ 阳离子。 LZ自己明鉴下。。。。 |
2楼2009-08-27 09:52:10
