Expanding the Coordination Cage: A Ruthenium(II)−Polypyridine Complex Exhibiting High Quantum Yields under Ambient Conditions

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• 作者：Frank Schramm ; Velimir Meded ; Heike Fliegl ; Karin Fink ; Olaf Fuhr ; Zhirong Qu ; Wim Klopper ; Stephen Finn ; Tia E. Keyes ; Mario Ruben
• 刊名：Inorganic Chemistry
• 出版年：2009
• 出版时间：July 6, 2009
• 年：2009
• 卷：48
• 期：13
• 页码：5677-5684
• 全文大小：858K
• 年卷期：v.48,no.13(July 6, 2009)
• ISSN：1520-510X

文摘

A mononuclear ruthenium(II) polypyridyl complex with an enlarged terpyridyl coordination cage was synthesized by the formal introduction of a carbon bridge between the coordinating pyridine rings. Structurally, the ruthenium(II) complex shows an almost perfect octahedral N6 coordination around the central Ru^II metal ion. The investigation of the photophysical properties reveals a triplet metal-to-ligand charge transfer emission with an unprecedented quantum yield of 13% and a lifetime of 1.36 μs at room temperature and in the presence of air oxygen. An exceptional small energy gap between light absorption and light emission, or Stokes shift, was detected. Additionally, time-dependent density functional theory calculations were carried out in order to characterize the ground state and both the singlet and triplet excited states. The exceptional properties of the new compound open the perspective of exploiting terpyridyl-like ruthenium complexes in photochemical devices under ambient conditions.