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Solvent-Triggered Reversible Phase Changes in Two Manganese-Based Metal-Organic Frameworks and Associated Sensing
Yike Huang1, Jun Zhang1, Dan Yue1
1State Key Laboratory of Silicon Materials, Cyrus Tang Center for Sensor Materials and Applications, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, P.R. China.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|June 7, 2018
Summary
A flexible manganese-based metal-organic framework (MOF), Mn-sdc-1, transforms into a new phase, Mn-sdc-2, triggered by water or heat. This study presents the first MOF phase diagram, enabling controllable synthesis and application in lead ion sensing.
Area of Science:
- Materials Science
- Chemistry
- Nanotechnology
Background:
- Flexible metal-organic frameworks (MOFs) exhibit dynamic structural changes.
- Controlling MOF phase transformations is crucial for targeted applications.
Purpose of the Study:
- To synthesize and characterize a flexible Mn-based MOF (Mn-sdc-1).
- To investigate the solid-state phase transformation between Mn-sdc-1 and Mn-sdc-2.
- To develop a phase diagram for MOFs and explore their sensing capabilities.
Main Methods:
- Synthesis of Mn-sdc-1 using 4,4'-stilbenedicarboxylic acid ligand.
- Induction of phase transformation using trace water and DMF.
- Temperature and water volume studies to establish a phase diagram.
- Luminescence quenching assay for Pb2+ detection.
Main Results:
- Successful synthesis of flexible Mn-sdc-1.
- Demonstration of reversible phase transformation between Mn-sdc-1 and Mn-sdc-2 induced by water and DMF.
- Construction of the first MOF phase diagram illustrating H2O/temperature-dependent changes.
- Development of water-stable Mn-sdc-2 as a sensitive Pb2+ sensor with a limit of detection of 31.4 nM.
Conclusions:
- The study establishes a controllable synthesis route for two distinct MOF phases.
- The developed MOF phase diagram provides valuable insights into framework dynamics.
- The water-stable Mn-sdc-2 phase shows promise for environmental monitoring applications, specifically in detecting lead ions.
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