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Related Experiment Video

Updated: Jun 12, 2026

Thermochemical Studies of Ni(II) and Zn(II) Ternary Complexes Using Ion Mobility-Mass Spectrometry

Thermochemical Studies of Ni(II) and Zn(II) Ternary Complexes Using Ion Mobility-Mass Spectrometry

Published on: June 8, 2022

A highly pH-sensitive Zn(II) chemosensor.

Carla Bazzicalupi¹, Andrea Bencini, Silvia Biagini

¹Dipartimento di Chimica Ugo Schiff, Università degli Studi di Firenze, Via della Lastruccia 3, Sesto Fiorentino, Florence, Italy.

Dalton Transactions (Cambridge, England : 2003)

|June 10, 2010

Summary

This summary is machine-generated.

This study introduces a novel ligand for detecting zinc ions (Zn(II)) using fluorescence. The ligand selectively binds Zn(II), causing a significant emission increase, suggesting its potential as a cellular zinc sensor.

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Area of Science:

Coordination Chemistry
Supramolecular Chemistry
Fluorescence Spectroscopy

Background:

Development of selective metal ion sensors is crucial for biological and environmental monitoring.
Fluorescent probes offer high sensitivity and selectivity for detecting metal ions.
Ligands incorporating signaling units like dichlorofluorescein (DCF) can be designed for specific metal ion recognition.

Purpose of the Study:

To synthesize and characterize a novel ligand H(2)L with bis(aminoethyl)amine (dien) and dichlorofluorescein (DCF) units.
To investigate the proton and metal ion binding properties of H(2)L with Cu(II), Zn(II), Cd(II), and Pb(II).
To explore the potential application of H(2)L as a fluorescent sensor for cellular zinc content.

Main Methods:

Potentiometric titrations to determine protonation constants.
UV-vis absorption and fluorescence emission spectroscopy to study metal ion binding.
Cellular imaging studies to evaluate sensor performance in biological systems.

Main Results:

The ligand H(2)L binds up to four protons, with amine groups being the primary protonation sites.
H(2)L exhibits selectivity for Zn(II) over Cd(II) and Pb(II) due to optimal binding pocket geometry.
Zn(II) binding induces a significant increase in DCF fluorescence emission, while Cd(II) causes a minor increase and Cu(II)/Pb(II) lead to quenching.
The ligand demonstrated potential for sensing intracellular Zn(II) levels.

Conclusions:

The synthesized ligand H(2)L shows selective binding and fluorescence response to Zn(II).
The observed fluorescence changes upon Zn(II) complexation highlight its utility as a fluorescent probe.
H(2)L holds promise as a novel sensor for evaluating cellular Zn(II) content and distribution.