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Updated: Nov 20, 2025
11:27
Synthesis and Characterization of Functionalized Metal-organic Frameworks
Published on: September 5, 2014
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Structural Variation and Switchable Nonlinear Optical Behavior of Metal-Organic Frameworks.
Lin Zhang1, Hongjun Li1, Huajun He1
1State Key Laboratory of Silicon Materials, Cyrus Tang Center for Sensor Materials and Applications, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China.
Small (Weinheim an Der Bergstrasse, Germany)
|January 20, 2021
Summary
Two europium metal-organic frameworks (MOFs) were synthesized with tailored structures. One MOF shows efficient luminescence, while the other exhibits significant second harmonic generation (SHG) nonlinear optical properties.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Crystallography
Background:
- Metal-organic frameworks (MOFs) offer tunable structures for advanced applications.
- Europium (Eu)-based MOFs are explored for their luminescent and nonlinear optical (NLO) properties.
- Controlling coordination modes and framework topology is key to functional MOF design.
Purpose of the Study:
- To selectively synthesize two europium MOFs (ZJU-23-Eu and ZJU-24-Eu) with distinct structures.
- To investigate the influence of structural variations on luminescence and NLO responses.
- To establish structure-property relationships for designing functional MOF-based NLO devices.
Main Methods:
- Selective synthesis of MOFs by adjusting solvent content.
- Characterization of crystal structures, coordination numbers, and framework topologies.
- Photoluminescence spectroscopy to study energy transfer and emission properties.
- Second Harmonic Generation (SHG) measurements to evaluate NLO activity.
Main Results:
- ZJU-23-Eu (8-coordinated Eu, 2D layered) exhibits efficient Eu3+ emission (614 nm) via ligand-to-Eu3+ energy transfer.
- ZJU-24-Eu (9-coordinated Eu, 3D framework) shows poor two-photon excited fluorescence due to Eu-Eu distances.
- Noncentrosymmetric ZJU-24-Eu displays strong SHG response (≈6.2x KDP), while centrosymmetric ZJU-23-Eu does not.
- Ligand triplet energy (19,998 cm-1) effectively sensitizes Eu3+ in ZJU-23-Eu.
Conclusions:
- Structural variations (coordination, connectivity, symmetry) significantly impact MOF optical properties.
- Tailoring MOF architecture enables distinct luminescence and NLO functionalities.
- These findings provide models for designing MOF-based NLO devices with on-demand functions.
Keywords:
lanthanidemetal-organic frameworkmultiphoton excited fluorescencesecond harmonic generationstructure modulationMore Related Videos
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