Replacement of quinolines with isoquinolines affords target metal ion switching from Zn2+ to Cd2+ in the fluorescent sensor TQLN (N,N,N′,N′-tetrakis(2-quinolylmethyl)-2,6-bis(aminomethyl)pyridine)

Yuji Mikata; Ayaka Takekoshi; Minori Kaneda; Hideo Konno; Keiko Yasuda; Masato Aoyama; Satoshi Tamotsu

doi:10.1039/C6DT03948K

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Replacement of quinolines with isoquinolines affords target metal ion switching from Zn²⁺ to Cd²⁺ in the fluorescent sensor TQLN (N,N,N′,N′-tetrakis(2-quinolylmethyl)-2,6-bis(aminomethyl)pyridine)†

Yuji Mikata,

*^abc Ayaka Takekoshi,^c Minori Kaneda,^c Hideo Konno,^d Keiko Yasuda,^a Masato Aoyama^a and Satoshi Tamotsu^a

Author affiliations

* Corresponding authors

^a Department of Chemistry, Biology, and Environmental Science, Faculty of Science, Nara Women's University, Nara 630-8506, Japan
E-mail: mikata@cc.nara-wu.ac.jp

^b KYOUSEI Science Center, Nara Women's University, Nara 630-8506, Japan

^c Department of Chemistry, Faculty of Science, Nara Women's University, Nara 630-8506, Japan

^d National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan

Abstract

A quinoline-based heptadentate ligand, N,N,N′,N′-tetrakis(2-quinolylmethyl)-2,6-bis(aminomethyl)pyridine (TQLN), exhibits a Zn²⁺-specific fluorescence increase at 428 nm, which is assigned to excimer emission (I_Zn/I₀ = 38, I_Cd/I_Zn = 24%, ϕ_Zn = 0.069). In contrast, the isoquinoline counterpart 1-isoTQLN exhibits a Cd²⁺-specific fluorescence increase at 365 nm attributable to monomer emission (I_Cd/I₀ = 83, I_Zn/I_Cd = 19%, ϕ_Cd = 0.015).

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Article information

DOI: https://doi.org/10.1039/C6DT03948K
Article type: Communication
Submitted: 13 Oct 2016
Accepted: 08 Dec 2016
First published: 08 Dec 2016

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Dalton Trans., 2017,46, 632-637

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Replacement of quinolines with isoquinolines affords target metal ion switching from Zn²⁺ to Cd²⁺ in the fluorescent sensor TQLN (N,N,N′,N′-tetrakis(2-quinolylmethyl)-2,6-bis(aminomethyl)pyridine)

Y. Mikata, A. Takekoshi, M. Kaneda, H. Konno, K. Yasuda, M. Aoyama and S. Tamotsu, Dalton Trans., 2017, 46, 632 DOI: 10.1039/C6DT03948K

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Dalton Transactions