Synthesis of New Phenanthroline‐Based Heteroditopic Ligands – Highly Efficient and Selective Fluorescence Sensors for Copper(II) Ions

Abstract

The heteroditopic phenanthroline derivatives 5,6-bis(2-pyridylcarboxamido)-1,10-phenanthroline (H 2 L 1 ) and 5,

Ratiometric and selective fluorescent chemodosimeter for Cu(II) by Cu(II)‐induced oxidation

“…Because copper is an essential trace element in biological systems at low concentration but acts as a pollutant when its concentration is high, there is particular attention on the design of new fluorescent probes for the detection of copper ion (5). However, many of the reported Cu(II) fluorescent chemosensors undergo fluorescence quenching upon the addition of Cu(II) (6)(7)(8)(9)(10), although there are still some probes that show fluorescent enhancement (11)(12)(13)(14). Compared to fluorescence quenching and enhancement, a ratiometric fluorescent response is considered to be more efficient, not only because of its higher sensitivity but also because of its better resistance to background fluorescence and variation of fluorescent probe concentration (15)(16)(17)(18).…”

Synthesis of Rhodamine-based Chemosensor and Determination of Spectral Properties

“…Until recently, a number of the chemosensors for Cu 2+ detection had been developed and the selectivity and efficiency should be continuously improved. Due to the paramagnetic effect of copper ions, some chemosensors often undergo fluorescence quenching upon binding of Cu 2+ [4,5]. Rhodamine derivatives as a chomosensor sensing and detecting metal cation drew attention in the field of organic sensors by the outstanding advantages of their photophysical properties, such as long wavelength absorption and emission, high quantum yield, and large extinction coefficient [6].…”

A New Luminescent Ruthenium(II) Polypyridine‐derived Dipicolylamine Complex as a Sensor for Cu2+ Ions

“…[4][5][6][7] However, few of them are based on heavy-metal complexes such as ruthenium complexes. 8 Compared with organic dyes, ruthenium complexes with low-lying excited states and long-wavelength emission behave as a promising class of luminescent sensors for analytes, including protons, 9 ions [10][11][12][13][14] and biomolecules, 15 because these advantages allow their luminescence easily separated from fluorescent backgrounds. It is well known that di(2-picolyl)amine (DPA) moiety in particular has been widely employed because of its specificity for Zn 2 ＋ over other metal ions.…”