Sequential Recognition of Zinc and Pyrophosphate Ions in a Terpyridine-Functionalized Single Nanochannel

详细信息    查看全文

• 作者：Prof. Yuqi Zhang ; Ru Zhou ; Dr. Zhiju Zhao ; Dr. Xiang-Yu Kong ; Ganhua Xie ; Dr. Qian Liu ; Pei Li ; Zhen Zhang ; Kai Xiao ; Prof. Zhengping Liu ; Prof. Liping Wen and Prof. Lei Jiang
• 刊名：ChemPhysChem
• 出版年：2017
• 出版时间：January 18, 2017
• 年：2017
• 卷：18
• 期：2
• 页码：253-259
• 全文大小：1321K
• ISSN：1439-7641

文摘

A highly selective recognition system for zinc(II) and pyrophosphate ions is constructed using a single conical nanochannel covalently functionalized with N′-{4-[(2,2′:6′,2′′-terpyridine)-4-yl]benzyl}ethane-1,2-diamine (TPYD). The immobilized TPYD acts as a specific coordination site for Zn²⁺ to form TPYD–Zn²⁺ complexes in preference over other metal ions, and subsequently, the resulting Zn²⁺-coordinated nanochannel can be used as a selective recognition element for the pyrophosphate ion based on the coordination reaction between hydroxyl oxygen atoms of pyrophosphate and Zn²⁺. Ion recognition is monitored by measuring the current–voltage curves of the solutions. The ionic current of the TPYD-functionalized system at −2.0 V undergoes a clear decrease after exposure to Zn²⁺ ions and is followed with an obvious increase after subsequent treatment with a pyrophosphate solution. The change of ionic current can be primarily attributed to the variation of charge density of the nanochannel. This functionalized single nanochannel might provide a simple and universal means to recognize other targets by modifying different functional molecules onto the inner surfaces of nanochannels.