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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
Published on: July 21, 2011
Nanoporous lanthanide-carboxylate frameworks based on 5-nitroisophthalic acid
San-Ping Chen1, Yi-Xia Ren, Wei-Tao Wang
1Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry & Materials Science, Northwest University, Xi'an, 710069, People's Republic of China.
Dalton Transactions (Cambridge, England : 2003)
|January 28, 2010
Summary
Researchers synthesized three novel lanthanide polymers using 5-nitroisophthalic acid. These metal-organic frameworks exhibit reversible guest molecule removal and interesting photoluminescent properties.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Nanotechnology
Background:
- Lanthanide-based metal-organic frameworks (MOFs) are promising for various applications.
- 5-nitroisophthalic acid is a versatile ligand for MOF synthesis.
Purpose of the Study:
- To synthesize and characterize novel nanoporous lanthanide polymers.
- To investigate the guest molecule adsorption and photoluminescent properties of the synthesized MOFs.
Main Methods:
- Solvothermal synthesis using lanthanide nitrates and 5-nitroisophthalic acid.
- Single-crystal X-ray diffraction for structural analysis.
- Thermogravimetric-Differential Scanning Calorimetry (TGA-DSC) and Powder X-ray Diffraction (PXRD) for guest removal analysis.
- Microcalorimetry for heat of adsorption measurement.
- Photoluminescence spectroscopy.
Main Results:
- Three isomorphous nanoporous lanthanide polymers, {[Ln(2)(5-nip)(3)(DMF)(4)](DMF)(2)}(n), were successfully synthesized.
- The frameworks feature 3D metal-organic structures with 2D intersecting channels.
- Guest DMF molecules were reversibly removed and adsorbed with a heat of 10.3 kJ mol(-1).
- Photoluminescent properties were investigated.
Conclusions:
- The synthesized lanthanide polymers are stable, porous materials with potential for guest molecule adsorption.
- The reversible adsorption/desorption of guest molecules highlights their potential for separation and storage applications.
- The photoluminescent properties warrant further investigation for optoelectronic applications.
