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

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)

Dalton Trans. 2017 Jan 17;46(3):632-637. doi: 10.1039/c6dt03948k.

Authors

Yuji Mikata¹, Ayaka Takekoshi², Minori Kaneda², Hideo Konno³, Keiko Yasuda⁴, Masato Aoyama⁴, Satoshi Tamotsu⁴

Affiliations

¹ Department of Chemistry, Biology, and Environmental Science, Faculty of Science, Nara Women's University, Nara 630-8506, Japan. [email protected] and KYOUSEI Science Center, Nara Women's University, Nara 630-8506, Japan and Department of Chemistry, Faculty of Science, Nara Women's University, Nara 630-8506, Japan.
² Department of Chemistry, Faculty of Science, Nara Women's University, Nara 630-8506, Japan.
³ National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.
⁴ Department of Chemistry, Biology, and Environmental Science, Faculty of Science, Nara Women's University, Nara 630-8506, Japan. [email protected].

PMID: 27981329
DOI: 10.1039/c6dt03948k

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).