Sensitive and selective detection of Cu(II) ion: A new effective 1,8‐naphthalimide‐based fluorescence ‘turn off’ sensor

Abstract

The present study reports the development of a new 1,8-naphthalimide-based fluorescent sensor V for monitoring Cu(II) ions. The sensor exhibited pH independence over a wide pH range 2.52-9.58, and indicated its possible use for monitoring Cu(II) ions in a competitive pH medium. The sensor also showed high selectivity and sensitivity towards the Cu(II) ions over other competitive metal ions in DMSO-HEPES buffer (v/v, 1:1; pH 7.4) with a fluorescence 'turn off' mode of 79.79% observed. A Job plot indicated the formation of a 1:1 binding mode of the sensor with Cu(II) ions. The association constant and detection limit were 1.14 × 10 M and 4.67 × 10 M, respectively. The fluorescence spectrum of the sensor was quenched due to the powerful paramagnetic nature of the Cu(II) ions. Potential application of this sensor was also demonstrated when determining Cu(II) ion levels in two different water samples.

A selective fluorescence probe for copper(II) ion in aqueous solution based on a 1,8-naphthalimide Schiff base derivative

“…Nowadays, there is still an intense demand for Cu 2+ fluorescent probes, especially those that can function in actual water samples. Derivatives of 1,8-naphthalimide are widely employed as fluorophores of choice due to their advantageous features of excellent photophysical fluorescent properties, strong absorption bands in the visible region, and large Stokes shifts, which allow this method to overshadow the merits of other conventional analytical methods [40][41][42][43][44][45][46][47][48][49]. Herein, we describe the synthesis of a new fluorescent probe HL for Cu 2+ detection that satisfies the prerequisite for the proposition of an efficient fluorescent probe.…”

A brief review on novel pyrene based fluorometric and colorimetric chemosensors for the detection of Cu2+

“…115 As Cu 2+ has an unfilled d shell, it probably quenches the emission of the fluorophore via electron transfer. 116 The receptor 46 has a thiacalix [4]arene moiety with two different side arms in which two pyrene-appended triazole rings are incorporated at one side of the thiacalix [4] arene cavity and the other side contains two urea moieties with various phenyl groups. Herein, an effective positive allosteric effect of 46 was also observed for Ag + with Cl -.…”

A highly sensitive fluorescent 1,8‐naphthalimide Schiff base probe for detection of Hg2+

“…In previous work, a series of fluorescent probes based on 1,8‐naphthalimide moiety to efficiently detect harmful and polluting anions and cations have been synthesized. [ 40–52 ] Guided by the above results and considerations, herein, a kind of “turn‐on” fluorescent probe N ‐allyl‐4‐(ethylenediamine‐salicylidene)‐1,8‐naphthalimide ( HL ) based on a naphthalimide framework for Hg 2+ ions detection has been designed, synthesized, and characterized. In addition, photophysical characteristics and sensor ability of the probe HL for the monitoring of Hg 2+ ions have been further researched.…”