Sequential recognition of zinc and pyrophosphate ions in a terpyridine-functionalized single nanochannel

Yuqi Zhang, Ru Zhou, Zhiju Zhao, Xiang-Yu Kong, Ganhua Xie, Qian Liu, Pei Li, Zhen Zhang, Kai Xiao, Zhengping Liu, Liping Wen, Lei Jiang

Research output: Contribution to journalArticleResearchpeer-review

10 Citations (Scopus)

Abstract

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 -2.0V 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.

Original languageEnglish
Pages (from-to)253-259
Number of pages7
JournalChemPhysChem
Volume18
Issue number2
DOIs
Publication statusPublished - 18 Jan 2017
Externally publishedYes

Keywords

  • Asymmetric nanochannels
  • Chemical functionalization
  • Pyrophosphate
  • Recognition
  • Zinc

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