Related Experiment Video
Updated: May 4, 2026
12:52
IridiumIII Luminescent Probe for Detection of the Malarial Protein Biomarker Histidine Rich Protein-II
Published on: July 7, 2015
11.2K
A simple coumarin as a turn-on fluorescence sensor for Al(III) ions
Tianrong Li1, Ran Fang, Baodui Wang
1Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, State Key Laboratory of Applied Organic Chemistry, and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, People's Republic of China. yangzy@lzu.edu.cn.
Dalton Transactions (Cambridge, England : 2003)
|January 3, 2014
Summary
A new sensor, 8-acetyl-7-hydroxy-4-methylcoumarin (AHMC), was developed for detecting aluminum ions (Al3+). This sensor shows a strong fluorescence "turn-on" signal specifically for Al3+ in solution.
Area of Science:
- Analytical Chemistry
- Materials Science
- Spectroscopy
Background:
- Development of selective and sensitive metal ion sensors is crucial for environmental and biological monitoring.
- Fluorescence-based sensors offer advantages like high sensitivity and real-time detection capabilities.
- Aluminum ions (Al3+) play roles in various biological processes but can be toxic at elevated levels, necessitating accurate detection methods.
Purpose of the Study:
- To synthesize a novel chemosensor, 8-acetyl-7-hydroxy-4-methylcoumarin (AHMC), for the selective detection of aluminum ions (Al3+).
- To investigate the photophysical properties and sensing mechanism of AHMC towards Al3+.
- To explore the potential application of AHMC as a fluorescent probe in methanol-water media.
Main Methods:
- Synthesis of 8-acetyl-7-hydroxy-4-methylcoumarin (AHMC).
- Spectroscopic studies (UV-Vis absorption and fluorescence emission) to evaluate the sensor's response to Al3+ and other metal ions.
- Fluorescence titration experiments to determine the binding stoichiometry and affinity.
- Theoretical calculations (e.g., DFT) to elucidate the structure of the AHMC-Al complex and rationalize experimental observations.
Main Results:
- AHMC was successfully synthesized and characterized.
- The sensor exhibited a significant fluorescence "turn-on" response selectively in the presence of Al3+ ions.
- The selectivity of AHMC for Al3+ was demonstrated over other common metal ions (e.g., Fe3+, Cu2+, Zn2+).
- Theoretical calculations supported the experimental findings, providing insights into the coordination mode and electronic structure of the AHMC-Al complex.
Conclusions:
- 8-acetyl-7-hydroxy-4-methylcoumarin (AHMC) is a highly effective and selective fluorescent sensor for Al3+ detection.
- The fluorescence "turn-on" mechanism provides a reliable signal for quantitative analysis.
- AHMC holds promise for practical applications in sensing Al3+ in various samples.
More Related Videos
Related Concept Videos
01:14Photoluminescence: Applications
1.3K
Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
1.3K
00:39Complexometric Titration: Overview
10.9K
Complexometric titration involves the formation of a complex by reacting a metal ion with one or more ligands. A visual indicator often detects the end point of a complexometric titration. It is added to the metal solution before the titration, forming a stable metal–indicator complex and imparting color to the solution. As the titration approaches the equivalence point, the excess of the added ligand displaces the indicator from the metal–indicator complex, releasing the free...
10.9K
01:00Coulometry: Overview
1.8K
Coulometry is one of the rapid, most accurate, and precise analytical techniques that determine the quantity of an analyte by measuring the electrical charge needed for its complete electrolysis without using any analytical standards. The total charge passed during electrolysis correlates with the analyte amount by Faraday's laws of electrolysis. For accurate coulometric measurements, a charge equal to Faraday's constant multiplied by the number of electrons involved in the relevant...
1.8K
01:25Fluorescence and Phosphorescence: Instrumentation
1.9K
Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.
1.9K
03:02Colors and Magnetism
12.1K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
12.1K
00:43Complexometric Titration: Ligands
2.5K
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
2.5K