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Discovery and Synthesis Optimization of Isoreticular Al(III) Phosphonate-Based Metal-Organic Framework Compounds Using High-Throughput Methods
Published on: October 6, 2023
Unconventional metal organic frameworks: porous cross-linked phosphonates
1Department of Chemistry, Texas A & M University, College Station, Texas 77842-3012, USA.
Dalton Transactions (Cambridge, England : 2003)
|November 6, 2008
Summary
This study explores porous tin(IV) phosphonates, highlighting their high surface areas and stability. These materials differ from traditional metal-organic frameworks (MOFs) due to their nanoparticle structure, requiring advanced characterization methods.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Nanotechnology
Background:
- Metal-organic frameworks (MOFs) have grown rapidly, but evidence of stable, accessible porosity is often lacking.
- Pillared zirconium diphosphonates and tin(IV) phosphonates represent newer porous materials with distinct properties.
Purpose of the Study:
- To investigate the characteristics of porous pillared zirconium diphosphonates and tin(IV) phosphonates.
- To demonstrate the high surface areas and stability of tin(IV) phosphonate materials.
- To differentiate these materials from conventional MOFs in terms of structure and characterization.
Main Methods:
- Synthesis of tin(IV) and zirconium phosphonate materials using various diphosphonate pillars and spacers.
- Characterization of porosity, surface area, and thermal/chemical stability.
- Utilizing electron microscopy (EM), nuclear magnetic resonance (NMR), and spectroscopic techniques for structural analysis.
Main Results:
- Tin(IV) monophosphonates form spherical globules with high surface areas due to "house of cards" packing of nano-sized particles.
- 1,4-monophenyldiphosphonic acid with Sn(IV) yields highly porous materials (250-400 m²/g) in alcohol-water media.
- Synthesized materials exhibit stability up to 400°C in air, acid resistance, and resistance to desolvation collapse.
Conclusions:
- Tin(IV) phosphonates offer a promising class of porous materials with tunable properties and high stability.
- The nanoparticle nature and short-range order of these materials necessitate advanced characterization beyond traditional X-ray diffraction.
- These materials present new avenues for functionalization and application in various chemical processes.
