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A highly stable and white-light-emitting Eu(iii) MOF
Yongqin Wei1, Rongjian Sa1, Kechen Wu1
1State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fujian 350002, People's Republic of China. wkc@fjirsm.ac.cn.
Dalton Transactions (Cambridge, England : 2003)
|November 10, 2016
Summary
This study introduces a novel white-light-emitting metal-organic framework (MOF) using a unique organic ligand. The research demonstrates how ancillary ligands influence MOF structure and luminescence, achieving bright white light emission without dopants.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Luminescence
Background:
- Metal-organic frameworks (MOFs) offer tunable properties for various applications.
- Europium(III) ions are known for their characteristic red luminescence.
- Achieving white-light emission from MOFs often requires dopants or multiple emitters.
Purpose of the Study:
- To synthesize a novel, dopant-free white-light-emitting lanthanide MOF (LnMOF).
- To investigate the influence of ancillary ligands on MOF structure and luminescence.
- To explore the potential for enhancing luminescence through structural modifications.
Main Methods:
- Hydrothermal synthesis of two distinct Eu(III)-based MOFs using a π-conjugated ligand, 2-(2,4-disulfophenyl)imidazo(4,5-f)(1,10)-phenanthroline (H3sfpip).
- Structural characterization of the synthesized complexes, [Eu(H2O)2(OH)(Hsfpip)]·H2O (1) and [Eu(H2O)(oa)0.5(Hsfpip)]·2H2O (2).
- Luminescence spectroscopy to analyze the emission properties of the MOFs, including the effect of an ancillary ligand (oxalic acid, oa) and thermal treatment.
Main Results:
- Two Eu(III) MOFs were synthesized, with complex 2 incorporating oxalic acid exhibiting a stable 3D structure.
- Complex 1 showed weak red emission due to O-H oscillator quenching, while complex 2 displayed intense white light emission.
- The white light emission of complex 2 was enhanced by thermal treatment, attributed to its rigid and robust framework.
Conclusions:
- The choice of ancillary ligand critically impacts the coordination, topology, and luminescence of Eu(III) MOFs.
- A dopant-free white-light-emitting LnMOF was successfully developed, showcasing intense and tunable emission.
- The synthesized MOFs demonstrate potential for advanced lighting and sensing applications.
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