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首页> 外文期刊>Chemistry: A European journal >Surprising properties of a furo-furanone
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Surprising properties of a furo-furanone

机译：呋喃呋喃酮的惊人特性

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The electronic absorption, fluorescence, and excitation spectra of furo[3,4-c]furanone (1) have been measured in different solvents at different concentrations. We observed a complex dependence of absorption and excitation spectra as a function of the concentration in CH_2Cl_2 and THF due to aggregate formation. Interestingly, the fluorescence spectra were not affected. Resolving the puzzle was made possible by the fact that 1 fits perfectly into the channels of zeolite L (ZL) micro-crystals to form 1-ZL guest-host com-posites. The geometry of the ZL channel system ensures a well-defined orientation of the embedded dye molecules, thereby leading to a preferred orientation of their electronic transition dipole moment (ETDM) and thus to objects with pronounced optical an-isotropy properties. This enabled us to understand that in solution the mono-mers that are present at low concentration form an aggregate in which the molecules sit on top of each other and arrange into a J-type aggregate configuration at higher concentrations. The signature of the latter is observed in the 1-ZL composites. This seems to be the first example in which the insertion of molecules into a nanochannel micro-crystal has helped in understanding the weak intermolecular interactions that take place in solution.
机译：呋喃并[3,4-c]呋喃酮（1）的电子吸收，荧光和激发光谱已在不同浓度的不同溶剂中进行了测量。我们观察到由于聚集体的形成，吸收光谱和激发光谱与CH_2Cl_2和THF中的浓度呈函数关系。有趣的是，荧光光谱没有受到影响。解决方案之所以成为可能，是因为1完全适合于沸石L（ZL）微晶体的通道，从而形成1-ZL客体-主体复合物。 ZL通道系统的几何结构确保了嵌入染料分子的明确定义的取向，从而导致其电子跃迁偶极矩（ETDM）的优选取向，从而导致具有明显的光学各向异性的物体。这使我们能够理解，在溶液中以低浓度存在的单体形成一种聚集体，其中分子彼此重叠，并以较高浓度排列成J型聚集体构型。在1-ZL复合材料中观察到后者的特征。这似乎是第一个例子，其中将分子插入纳米通道微晶体中有助于理解溶液中发生的弱分子间相互作用。

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