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Zn(II)-Based Multivariate, Multicomponent Metal-Organic Framework as a Highly Sensitive Ratiometric Luminescent
Samiksha Painuly1,2, Gunjan Rajput1, Bhavesh Parmar3
1Department of Chemistry, RCU Government Post Graduate College, Uttarkashi 249193, Uttarakhand, India.
Inorganic Chemistry
|August 1, 2025
Summary
Researchers developed novel zinc-based metal-organic frameworks (MM-MOFs) for sensitive rhodamine-B detection. These materials offer self-calibrating sensing with enhanced fluorescence, enabling sub-ppm detection in real-world samples.
Area of Science:
- Materials Science
- Chemistry
- Nanotechnology
Background:
- Designing functional metal-organic frameworks (MOFs) requires advanced strategies.
- Multivariate and multicomponent approaches offer new possibilities for MOF design.
Purpose of the Study:
- To construct novel zinc-based multivariate, multicomponent metal-organic frameworks (MM-MOFs).
- To investigate the ratiometric fluorescence response of these MM-MOFs towards rhodamine-B (RhB).
- To develop a self-calibrating sensor for RhB detection.
Main Methods:
- Synthesis of zinc-based multivariate, multicomponent metal-organic frameworks (MM-MOFs).
- Characterization of fluorescence response to rhodamine-B (RhB).
- Analysis using Stern-Volmer, Benesi-Hildebrand, Freundlich isotherm, and Hill binding models.
- Investigation of adsorption behavior and energy transfer mechanisms.
Main Results:
- The novel MM-MOFs exhibited a ratiometric fluorescence response to RhB, with enhanced emission at 589 nm and quenching at 478 nm.
- The sensor system achieved self-calibrating detection of RhB at sub-ppm levels.
- A low limit of detection (0.126 ppm) was determined, with a linear Stern-Volmer profile.
- Heterogeneous and cooperative adsorption behavior and resonance energy transfer were identified as key mechanisms.
Conclusions:
- Integrating multivariate and multicomponent strategies successfully yielded new functional MOFs.
- The developed MM-MOFs show promise as efficient and self-calibrating sensors for RhB.
- The findings highlight the potential of advanced MOF design for sensing applications.
