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Sequential Recognition of Zinc and Pyrophosphate Ions in a Terpyridine‐Functionalized Single Nanochannel
Author(s) -
Zhang Yuqi,
Zhou Ru,
Zhao Zhiju,
Kong XiangYu,
Xie Ganhua,
Liu Qian,
Li Pei,
Zhang Zhen,
Xiao Kai,
Liu Zhengping,
Wen Liping,
Jiang Lei
Publication year - 2017
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201600923
Subject(s) - pyrophosphate , terpyridine , chemistry , ionic bonding , ion , molecular recognition , zinc , metal ions in aqueous solution , molecule , inorganic chemistry , supramolecular chemistry , covalent bond , metal , organic chemistry , enzyme
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 Zn 2+ to form TPYD–Zn 2+ complexes in preference over other metal ions, and subsequently, the resulting Zn 2+ ‐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 Zn 2+ . 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 Zn 2+ 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.