Red/Near-Infrared Luminescence Tuning of Group-14 Element Complexes of Dipyrrins Based on a Central Atom

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• 作者：Masaki Yamamura ; Marcel Albrecht ; Markus Albrecht ; Yoshinobu Nishimura ; Tatsuo Arai ; Tatsuya Nabeshima
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：February 3, 2014
• 年：2014
• 卷：53
• 期：3
• 页码：1355-1360
• 全文大小：317K
• ISSN：1520-510X

文摘

A dipyrrin complex has been one of the most utilized fluorescent dyes, and a variety of dipyrrin complexes show intriguing functions based on the various coordination structures of the central element. We now report the synthesis, structure, and photophysical properties of germanium and stannane complexes of the N2O2-type tetradentate dipyrrin, L路Ge and L路Sn, which are heavier analogues of the previously reported dipyrrin silicon complex, L路Si. The central group-14 atoms of the monomeric complexes have geometries close to trigonal bipyramidal (TBP), in which the contribution of the square-pyramidal (SP) character becomes higher as the central atom is heavier. Interestingly, L路Sn formed a dimeric structure in the crystal. All complexes L路Si, L路Ge, and L路Sn showed a fluorescence in the red/NIR region. Fluorescence quantum yields of L路Ge and L路Sn are higher than that of L路Si. These results indicated that the central atom on the dipyrrin complexes contributes not only to the geometry difference but also to tuning the fluorescence properties.