Related Experiment Video
Updated: Jun 1, 2026
08:01
Sulfate Separation by Selective Crystallization with a Bis-iminoguanidinium Ligand
Published on: September 8, 2016
Selective gas sorption in a [2+3] 'propeller' cage crystal
Shan Jiang1, John Bacsa, Xiaofeng Wu
1Department of Chemistry and Centre for Materials Discovery, University of Liverpool, Crown Street, Liverpool, L69 7ZD, UK.
Chemical Communications (Cambridge, England)
|June 14, 2011
Summary
A novel organic cage compound was synthesized for gas adsorption. This porous material selectively adsorbs hydrogen and carbon dioxide, unlike porous polymer membranes which show a capacity-selectivity trade-off.
Area of Science:
- Materials Science
- Supramolecular Chemistry
- Chemical Engineering
Background:
- Porous materials are crucial for gas separation and storage.
- Organic cage compounds offer tunable structures for selective adsorption.
- Existing porous polymer membranes often face a trade-off between sorption capacity and selectivity.
Purpose of the Study:
- To synthesize a new [2+3] organic cage compound.
- To investigate the gas adsorption properties of the synthesized material.
- To compare the performance with existing porous polymer membranes.
Main Methods:
- Synthesis via condensation reaction of 1,3,5-tri(4-formylphenyl)benzene and 1,5-pentanediamine.
- Characterization of the resulting porous molecular crystal.
- Gas adsorption/desorption studies to evaluate selectivity for H2, CO2, and N2.
Main Results:
- Successful synthesis of a [2+3] organic cage compound.
- The porous molecular crystal exhibited selective adsorption of hydrogen and carbon dioxide over nitrogen.
- Demonstrated potential for gas separation applications.
Conclusions:
- The synthesized organic cage compound shows promise for selective gas adsorption.
- This material offers an alternative to porous polymer membranes by potentially overcoming the capacity-selectivity trade-off.
- Further research could explore optimizing the cage structure for enhanced performance.
More Related Videos
Related Concept Videos
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
02:58Crystal Field Theory - Octahedral Complexes
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
03:24Hybridization of Atomic Orbitals I
The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
02:42Valence Bond Theory
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
03:35Hybridization of Atomic Orbitals II
sp3d and sp3d 2 Hybridization
02:30Chirality at Nitrogen, Phosphorus, and Sulfur
Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...