Fluorescence Color Modulation by Intramolecular and Intermolecular π−π Interactions in a Helical Zinc(II) Complex

作者：Shin Mizukami, Hirohiko Houjou, K. Sugaya, Emiko Koyama, Hideo Tokuhisa, Takeshi Sasaki, Masatoshi Kanesato · 发表于：Chemistry of Materials · 年份：2004 · DOI：10.1021/cm049744s · 被引用次数：257 · 研究领域：Molecular Sensors and Ion Detection、Metal complexes synthesis and properties、Luminescence and Fluorescent Materials

When a fluorescent compound shows unique optical properties, an elucidation of the mechanism may lead to an important development of novel sensing strategies. A helical 3,3‘-di- tert -butylsalen−zinc(II) complex, [Zn 2 L 1 2 ], has a red-shifted fluorescence as compared to that of [Zn L 2 2 ], a half-structured mononuclear complex of [Zn 2 L 1 2 ]; in addition, [Zn 2 L 1 2 ] exhibits a fluorescence color change from green to light blue under external stimulations. We investigated the origins of these phenomena by spectroscopy, fluorescence lifetime measurement, fluorescence microscopy, X-ray powder diffraction, and X-ray single-crystal analysis. From the experimental data, we concluded that intramolecular and intermolecular π−π interactions are critical elements that determine the shifts of the fluorescence to a longer wavelength.