Photophysical Properties and Singlet Oxygen Production by Ruthenium(II) Complexes of Benzo[i]dipyrido[3,2-a:2′,3′-c]phenazine: Spectroscopic and TD-DFT Study

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• 作者：Simon P. Foxon ; Mohammed A. H. Alamiry ; Mike G. Walker ; Anthony J. H. M. Meijer ; Igor V. Sazanovich ; Julia A. Weinstein ; James A. Thomas
• 刊名：Journal of Physical Chemistry A
• 出版年：2009
• 出版时间：November 19, 2009
• 年：2009
• 卷：113
• 期：46
• 页码：12754-12762
• 全文大小：432K
• 年卷期：v.113,no.46(November 19, 2009)
• ISSN：1520-5215

文摘

The photophysical properties of a series of Ru^II complexes containing benzo[i]dipyrido[3,2-a:2′,3′-c]phenazine (dppn) as a ligand are reported. Transient absorption spectroscopy studies indicate that, in contrast to related Ru(dppz) complexes (dppz = dipyrido[3,2-a:2′,3′-c]phenazine), the excited state of all the dppn systems is a long-lived ππ* triplet state. Computational studies (DFT and TD-DFT) confirm that the excited state is based on the dppn ligand. Near-infrared luminescence studies reveal that the complexes are efficient singlet oxygen sensitizers with yields of 70−83%.