Polypod Carboxylic Acid-Rare Earth Complex with High Cyclic Stability for Nitrobenzene Compound Detection

Area of Science:

• Materials Science
• Analytical Chemistry
• Coordination Chemistry

Background:

• The 5',5''-bis(4-carboxyphenyl)-[1,1':3',1':3'',1'''-quaterphenyl]-4,4'''-dicarboxylic (H4L1) ligand exhibits a rigid, planar structure with significant UV absorption, enabling an "antenna effect."
• Research into rare earth complexes utilizing H4L1 as the sole ligand is a developing area.

Purpose of the Study:

• To synthesize and characterize a novel organic rare earth composite using the H4L1 ligand and Europium (Eu).
• To investigate the potential of the synthesized L1-Eu composite as a fluorescent probe for detecting nitrobenzene compounds.

Main Methods:

• Solvothermal synthesis was employed to create the L1-Eu organic rare earth composite.
• Fluorescence spectroscopy was utilized to analyze the emission properties of the L1-Eu complex and its response to nitrobenzene compounds.

Main Results:

• The L1-Eu composite demonstrated a linear fluorescence response to nitrobenzene compounds.
• Low detection limits were achieved for nitrobenzene (0.910 µM), o-nitrophenol (8.401 µM), m-nitrophenol (24.510 µM), and p-nitrophenol (8.171 µM).
• The L1-Eu complex showed high sensitivity, selectivity against common interferents, good stability, and recyclability.

Conclusions:

• The L1-Eu composite serves as a highly effective fluorescent probe for the specific and sensitive detection of nitrobenzene compounds.
• This study presents a novel approach for the fluorescence-based detection of nitroaromatic pollutants.