pH-Dependent Spectroscopic and Luminescent Properties, and Metal-Ion Recognition Studies of Re(I) Complexes Containing 2-(2鈥?Pyridyl)benzimidazole and 2-(2鈥?Pyridyl)benzimidazolate

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• 作者：Biing-Chiau Tzeng ; Bo-So Chen ; Chang-Kai Chen ; Yuan-Ping Chang ; Wen-Chian Tzeng ; Tsung-Yi Lin ; Gene-Hsiang Lee ; Pi-Tai Chou ; Yu-Jie Fu ; A. Hsiu-Hua Chang
• 刊名：Inorganic Chemistry
• 出版年：2011
• 出版时间：June 20, 2011
• 年：2011
• 卷：50
• 期：12
• 页码：5379-5388
• 全文大小：1140K
• 年卷期：v.50,no.12(June 20, 2011)
• ISSN：1520-510X

文摘

A series of Re(I) complexes, [Re(CO)₃Cl(HPB)] (1), [Re(CO)₃(PB)H₂O] (2), [Re(CO)₃(NO₃)(PB-AuPPh₃)] (3), and [Re(CO)₃(NO₃)(PB)Au(dppm-H)Au]₂ (4) [HPB = 2-(2鈥?pyridyl)benzimidazole; dppm = 2,2鈥?bis(diphenylphosphinomethane)], have been synthesized and characterized by X-ray diffraction. Complex 1, which exhibits interesting pH-dependent spectroscopic and luminescent properties, was prepared by reacting Re(CO)₅Cl with an equimolar amount of 2-(2鈥?pyridyl)benzimidazole. The imidazole unit in complex 1 can be deprotonated to form the imidazolate unit to give complex 2. Addition of 1 equiv of AuPPh₃(NO₃) to complex 2 led to the formation of a heteronuclear complex 3. Addition of a half an equivalent of dppm(Au(NO₃))₂ to complex 2 yielded 4. In both 3 and 4, the imidazolate unit acts as a multinuclear bridging ligand. Complex 4 is a rare and remarkable example of a Re₂Au₄ aggregate in combination with 渭₃-bridging 2-(2鈥?pyridyl)benzimidazolate. Finally, complex 2 has been used to examine the Hg²⁺-recognition event among group 12 metal ions. Its reversibility and selectivity toward Hg²⁺ are also examined.