Effective Suppression of O2 Quenching of Photo-Excited Ruthenium Complex Using RNA Aptamer
著者
和文:
Min Iljae,
Tamaki Yusuke,
石谷治,
Serizawa Takeshi,
Ito Yoshihiro,
Uzawa Takanori.
英文:
Min Iljae,
Tamaki Yusuke,
Ishitani Osamu,
Serizawa Takeshi,
Ito Yoshihiro,
Uzawa Takanori.
言語
English
掲載誌/書名
和文:
英文:
Bulletin of the Chemical Society of Japan
巻, 号, ページ
Vol. 93
No. 11
pp. 1386-1392
出版年月
2020年10月
出版者
和文:
英文:
公益社団法人 日本化学会
会議名称
和文:
英文:
開催地
和文:
英文:
アブストラクト
<p>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.</p>
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