Development of solid-state two-component supramolecular fluorescent host system

由于有机化合物的固态光学性质与其溶液性质不同，固态有机荧光主体体系近年来引起了人们的极大关注。特别是，从合成和功能的角度来看，由两个或两个以上有机分子组成的超分子有机荧光主体系统已经变得越来越受欢迎。在本研究中，我们报道了一种由两个有机分子组成的固态荧光主体体系，该体系可以包括多种客体分子。以2-噻吩甲酸为荧光单羧酸分子和(1R，…)为荧光单体，成功地构建了一种具有手性通道空腔的新型手性超分子荧光主体体系更多的2S)-2-氨基-1，2-二苯乙醇作为手性胺分子。超分子荧光主体体系是由酸和胺分子组成的一维柱状氢键和离子键网络自组装而成的。该一维柱通过自组装形成通道状空腔，通过调节填充柱的填充量，将客体分子一维包合在空腔中。此外，将外消旋或手性(R)-2-萘乙胺分别与2，6-萘二甲酸结合，制备了一种新型的外消旋或手性超分子荧光主体体系。得到的两种配合物具有相似的二维层状网络结构。客体分子被包含在二维层状网络结构组装而成的通道状空穴中，超分子络合物在固态下显示出荧光。这一性质进一步扩展了荧光主体系统的适用性，因为它们可以用作分子识别/相互作用的灵敏荧光指示剂。此外，对所得到的配合物的络合行为和光学性质的研究有望为新型固态超分子荧光主体系统的设计提供有用的信息。较少

Solid-state organic fluorescence host systems have attracted much attention in recent times because the solid-state optical properties of organic compounds are different from their solution-state properties. In particular, from the viewpoint of synthesis and functionality, supramolecular organic fluorescence host systems composed of two or more organic molecules have become increasingly desirable. The supramolecular organic fluorophore resulting from such a system possesses effective fluorescence properties due to the synergistic effects of the packing style and the optical properties of the component molecules in the supramolecular complex.In this study, we report a solid-state fluorescent host system composed of two organic molecules that can include a variety of guest molecules.A novel chiral supramolecular fluorescent host system having chiral channel-like cavities was successfully created by using 2-thiophenecarboxylic acid as the fluorescent mono-carboxylic acid molecule and (1R, … More 2S)-2-amino-1,2-diphenylethanol as the chiral amine molecule. The supramolecular fluorescence host system was formed by the self-assembly of a 1D columnar hydrogen- and ionic-bonded network composed of acid and amine molecules. Channel-like cavities were constructed by self-assembly of this 1D column, and guest molecules were included one-dimensionally along the cavity by tuning the packing of this column.In addition, a novel racemic or chiral supramolecular fluorescent host system was prepared by combining racemic or chiral (R)-2-naphthylethylamine with 2,6-naphthalenedicarboxylic acid, respectively. The two complexes obtained were found to have similar 2D layered network structures. Guest molecules were included in the channel-like cavities formed from the assembly of the 2D layered network structure.The supramolecular complexes showed fluorescence in the solid state. This property further extends the applicability of the fluorescent host systems, because they can be used as sensitive fluorescent indicators for molecular recognition/interactions. Moreover, a study of the complexation behavior and optical property of the obtained complexes is expected to provide useful information that can be applied to the design of novel solid-state supramolecular fluorescent host systems. Less