Systematic Study of the Luminescent Europium-Based Nonanuclear Clusters with Modified 2-Hydroxybenzophenone Ligands

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• 作者：Bin Zhang ; Ting Xiao ; Chunmei Liu ; Qian Li ; Yanyan Zhu ; Mingsheng Tang ; Chenxia Du ; Maoping Song
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：December 2, 2013
• 年：2013
• 卷：52
• 期：23
• 页码：13332-13340
• 全文大小：374K
• 年卷期：v.52,no.23(December 2, 2013)
• ISSN：1520-510X

文摘

The reaction of 2-hydroxybenzophenone derivatives with europium ions has afforded a new family of luminescent nonanuclear Eu(III) clusters. Crystal structure analysis of the clusters reveals that the metal core comprises two vertex-sharing square pyramidal units. Most of these complexes show emissions typical of Eu³⁺ ion under visible light excitation (400鈥?20 nm) at room temperature. Photophysical characterization and DFT study reveal a correlation between luminescent efficiencies of Eu(III) complexes and the electronic features of the ligands, which can be tuned by the nature of substituents in the 4-position of the ligands. The ligands with a fluorine substituent possess more suitable triplet energy levels, resulting in more intensive luminescence.