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Related Experiment Video

Updated: Jul 14, 2026

Nanostructured Ag-zeolite Composites as Luminescence-based Humidity Sensors

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Published on: November 15, 2016

A ratiometric fluorescent sensor for Ag(I) with high selectivity and sensitivity.

Rong-Hua Yang¹, Wing-Hong Chan, Albert W M Lee

¹Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Kowloon, Hong Kong, China.

Journal of the American Chemical Society

|March 6, 2003

Summary

A novel pyrenyl-based sensor detects silver iodide (AgI) with high sensitivity. Upon binding silver ions, the sensor exhibits enhanced fluorescent signals, enabling precise ratiometric detection.

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Area of Science:

Supramolecular Chemistry
Analytical Chemistry
Materials Science

Background:

Development of sensitive and selective fluorescent sensors is crucial for environmental monitoring and chemical analysis.
Pyrene-based compounds are widely explored as fluorescent probes due to their favorable photophysical properties, including excimer formation.

Purpose of the Study:

To synthesize and characterize a novel bicyclic cycloadduct bearing a pyrenyl moiety.
To investigate the potential of this compound as a ratiometric fluorescent sensor for silver iodide (AgI).

Main Methods:

Synthesis of the bicyclic cycloadduct (compound 1).
Spectroscopic investigation (fluorescence spectroscopy) of compound 1 in aqueous ethanol solution.
Analysis of the interaction between compound 1 and silver ions to elucidate the sensing mechanism.

Main Results:

The synthesized bicyclic cycloadduct (1) successfully functions as a fluorescent sensor for AgI.
In the presence of silver ions, a 1:2 metal-ligand complex is formed.
A significant enhancement in pyrene excimer emission was observed, with a simultaneous decrease in monomer emission, enabling ratiometric detection.

Conclusions:

The pyrenyl-based bicyclic cycloadduct is an effective ratiometric fluorescent sensor for AgI.
The sensor's response relies on the formation of a specific metal-ligand complex, leading to distinct changes in fluorescence emission spectra.
This study presents a promising new tool for the sensitive detection of silver ions.