作者：Baoli Dong,　Mingliang Wang*, Chunxiang Xu*, Qi Feng, and Yan Wang
关键字：Solid-State Fluorescence, Conjugated Molecule
论文来源：期刊
具体来源：Cryst. Growth Des. 12(12), 5986?5993, 2012
发表时间：2012年
1-(5-(Anthracen-9-yl)-3-(4-methoxyphenyl)-4,5-dihydropyrazol-1-yl)ethanone was synthesized and crystallized to provide three types of crystals with different fluorescent colors and host–guest structures. Crystal structure analysis reveals that this compound possesses twisted π-conjugated structure and different degrees of distortion depending on guest molecules in the three crystal structures. The anthracene fluorophore stacking modes are regulated from monomer arrangement to face-to-face π-stacked arrangement by means of the entrapment of organic acid molecules in the lattice. The vibrational spectroscopy, thermal behaviors, diffuse reflectance absorption spectroscopy, solid-state fluorescence properties, and fluorescence quantum yields and lifetimes of the three types of crystals were investigated. Such properties are closely related to the fluorophore stacking modes and intermolecular electronic interactions in crystals. The π-stacked geometries of anthracene fluorophores are responsible for the red-shifted emissions and longer fluorescence lifetimes. It indicates that the optical properties of organic materials could be modulated by entrapping different guest molecules in lattice.