Highly Sensitive and Selective Difunctional Ruthenium(II) Complex-Based Chemosensor for Dihydrogen Phosphate Anion and Ferrous Cation

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• 作者：Ze-Bao Zheng ; Zhi-Ming Duan ; Ying-Ying Ma ; Ke-Zhi Wang
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：March 4, 2013
• 年：2013
• 卷：52
• 期：5
• 页码：2306-2316
• 全文大小：512K
• 年卷期：v.52,no.5(March 4, 2013)
• ISSN：1520-510X

文摘

The anion-interaction properties of a Ru(II) complex of [Ru(bpy)₂(Htppip)](ClO₄)₂路H₂O路DMF (RuL) {bpy =2,2鈥?bipyridine and Htppip =2-(4-(2,6-di(pyridin-2-yl)pyridin-4-yl)phenyl)-1H-imidazo[4,5-f][1,10]phenanthroline} were thoroughly investigated in CH₃CN and CH₃CN/H₂O (50:1, v/v) solutions by UV鈥搗isible absorption, emission, and ¹H NMR spectra. These analyses revealed that RuL acts as an efficient 鈥渢urn on鈥?emission sensor for H₂PO₄^{鈥?/sup>, and a 鈥渢urn off鈥?sensor for F鈥?/sup> and OAc鈥?/sup>; in addition, RuL exhibited slightly disturbed emission spectra in the presence of the other anions studied (Cl鈥?/sup>, Br鈥?/sup>, I鈥?/sup>, NO₃鈥?/sup>, and ClO₄鈥?/sup>). The cation-sensing properties of RuL were also studied in both neat CH₃CN and aqueous 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid buffer (pH = 7.2)/CH₃CN (71/1, v/v) solutions. RuL was found to exhibit a colorimetric sensing ability that was highly selective for Fe2+, as evidenced by an obvious color change from pale yellow to light red-purple to the naked eye over the other cations studied (Na+, Mg2+, Ba2+, Mn2+, Fe3+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+, Hg2+, and Ag+). To obtain insights into the possible binding modes and the sensing mechanisms, 1H NMR spectral analysis, luminescence lifetime measurements, and density functional theoretical calculations were also performed.}