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N,N,N′,N′ ‐Tetrakis(3‐isoquinolylmethyl)‐2,6‐lutidylenediamine (3‐isoTQLN): A Fluorescent Zn 2+ /Cd 2+ Dual Sensor as a Hybrid of 2‐Quinolyl/1‐Isoquionolyl Counterparts TQLN/1‐isoTQLN
Author(s) -
Mikata Yuji,
Takekoshi Ayaka,
Kaneda Minori,
Yonemura Shizuka,
Aono Yuri,
Matsumoto Arimasa,
Konno Hideo,
Burdette Shawn C.
Publication year - 2021
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.202001171
Subject(s) - chemistry , fluorescence , excimer , zinc , molecule , quinoline , isoquinoline , metal , metal ions in aqueous solution , monomer , photochemistry , stereochemistry , crystallography , organic chemistry , polymer , physics , quantum mechanics
Fluorescence detection of Zn 2+ and Cd 2+ is of continuing interest due to their significant importance in biological and environmental sciences. Strict discrimination of Zn 2+ and Cd 2+ by fluorescent probe molecules has still been a challenging task because of the small difference in ionic radii of these group 12 metal ions. In this study, three heptadentate fluorescent probes with a common 2,6‐lutidylenediamine core and four quinoline/isoquinoline sidearms are presented. The N,N,N′,N′ ‐tetrakis( 2‐quinolyl methyl)‐2,6‐lutidylenediamine (TQLN) exhibits Zn 2+ ‐specific fluorescence enhancement via an excimer formation, while the N,N,N′,N′ ‐tetrakis( 1‐isoquinolyl methyl)‐2,6‐lutidylenediamine (1‐isoTQLN) responds specifically to Cd 2+ at the short wavelength region by monomer emission. The N,N,N′,N′ ‐tetrakis( 3‐isoquinolyl methyl)‐2,6‐lutidylenediamine (3‐isoTQLN) responds to both Zn 2+ and Cd 2+ at different emission wavelengths, acting as a dual sensor with hybrid properties of TQLN and 1‐isoTQLN. Methoxy‐substituted derivatives of 1‐ and 3‐isoTQLN were also examined.