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Quinoline- and isoquinoline-derived ligand design on TQEN (N,N,N′,N′-tetrakis(2-quinolylmethyl)ethylenediamine) platform for fluorescent sensing of specific metal ions and phosphate species

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Abstract

Rational molecular structure alterations of TQEN (N,N,N′,N′-tetrakis(2-quinolylmethyl)ethylenediamine) produced variable fluorescent sensors for specific metal ions and phosphate species. Utilization of methoxy-substituted quinoline and isoquinoline chromophores, conformational restriction and multidentate coordination structure allow discrimination between Zn2+ and Cd2+. Pyrophosphate (P2O74−, PPi) and phosphate (PO43−) also are selectively detected with dinuclear Zn2+ complexes of tetrakisquinoline-based ligands. Differential stability and structure of the metal complexes, as well as resulting fluorescence enhancement mechanism, such as intramolecular excimer formation via change in coordination geometry, play key roles in the discrimination of target ions.

Graphical abstract: Quinoline- and isoquinoline-derived ligand design on TQEN (N,N,N′,N′-tetrakis(2-quinolylmethyl)ethylenediamine) platform for fluorescent sensing of specific metal ions and phosphate species

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Article information


Submitted
29 Aug 2020
Accepted
09 Oct 2020
First published
12 Oct 2020

Dalton Trans., 2020, Advance Article
Article type
Frontier

Quinoline- and isoquinoline-derived ligand design on TQEN (N,N,N′,N′-tetrakis(2-quinolylmethyl)ethylenediamine) platform for fluorescent sensing of specific metal ions and phosphate species

Y. Mikata, Dalton Trans., 2020, Advance Article , DOI: 10.1039/D0DT03024D

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