1000-Fold Enhancement of Luminescence Lifetimes via Energy-Transfer Equilibration with the T1 State of Zn(TPP)

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• 作者：Brian W. Cohen ; Benjamin M. Lovaasen ; Cheslan K. Simpson ; Scott D. Cummings ; Richard F. Dallinger ; Michael D. Hopkins
• 刊名：Inorganic Chemistry
• 出版年：2010
• 出版时间：July 5, 2010
• 年：2010
• 卷：49
• 期：13
• 页码：5777-5779
• 全文大小：673K
• 年卷期：v.49,no.13(July 5, 2010)
• ISSN：1520-510X

文摘

The new zinc porphyrin/tungsten alkylidyne dyad Zn(TPP)−C≡CC₆H₄C≡W(dppe)₂Cl (1) possesses novel photophysical properties that arise from a tunable excited-state triplet−triplet equilibrium between the porphyrin and tungsten alkylidyne units. Dyad 1 exhibits ³(d_xy ← π*(WCR)) phosphorescence with a lifetime that is 20 times longer than that of the parent chromophore W(CC₆H₄CCPh)(dppe)₂Cl (2). The triplet−triplet equilibrium can be tuned by the addition of ligands to the Zn center, resulting in phosphorescence lifetimes for 1(L) that are up to 1300 times longer than that of 2. The “lifetime reservoir” effect exhibited by 1(L) is approximately 1 order of magnitude larger than previously reported examples of the phenomenon.