Effective Suppression of O2 Quenching of Photo-Excited Ruthenium Complex Using RNA Aptamer

• Iljae Min

  RIKEN CEMS, 2-1 Hirosawa, Wako, Saitama 351-0198 , Japan

• Yusuke Tamaki

  Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550 , Japan

• Osamu Ishitani

  Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550 , Japan

• Takeshi Serizawa

  Department of Chemical Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550 , Japan

• Yoshihiro Ito

  RIKEN CEMS, 2-1 Hirosawa, Wako, Saitama 351-0198 , Japan

• Takanori Uzawa

  RIKEN CEMS, 2-1 Hirosawa, Wako, Saitama 351-0198 , Japan

抄録

Ruthenium polypyridyl complexes have been widely studied to convert light energy to chemical or electric energy for various applications. To practically use the complexes, it is necessary to suppress as much as possible the very effective deactivation of their triplet metal-to-ligand charge transfer (3MLCT) excited states by O2 (O2 quenching). In a previous study, we reported that an RNA aptamer can almost completely suppress the O2 quenching of [Ru(bpy)3]2+. Thus motivated, we here further investigate and clarify the generality of such O2-insensitization of a ruthenium complex using aptamer. Specifically, we demonstrate the O2-insensitization using another aptamer for a ruthenium complex, (4,4′-methylphosphonic acid-2,2′-bipyridine) bis(4,4′-dimethyl-2,2′-bipyridine) ruthenium (RuCP). We selected an RNA aptamer that binds to RuCP using SELEX. The aptamer binding to RuCP elongated the lifetime of the 3MLCT excited state of RuCP approximately 1.5 fold under aerobic conditions. The elongated lifetime of aptamer-bound RuCP was even longer than that of RuCP under anaerobic condition. We also found that a charge transfer can occur from a sacrificial electron donor to the aptamer-bound RuCP. Thus, we propose that RNA aptamer is one promising strategy to avoid the very effective deactivation of the 3MLCT excited states of ruthenium complexes while retaining their effective photo-redox properties.

収録刊行物

• Bulletin of the Chemical Society of Japan

  Bulletin of the Chemical Society of Japan 93 (11), 1386-1392, 2020-10-13

  Oxford University Press (OUP)

キーワード

• General Chemistry

詳細情報

• CRID: 1361412342208595200
• NII論文ID: 130007939826
• DOI: 10.1246/bcsj.20200121
• ISSN: 13480634
• ISSN: 00092673
• Web Site: https://academic.oup.com/bcsj/article-pdf/93/11/1386/56305499/bcsj.20200121.pdf
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