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Related Concept Videos

Metallic Solids02:37

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
Exceptions to the Octet Rule02:55

Exceptions to the Octet Rule

Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
Crystal Field Theory - Octahedral Complexes02:58

Crystal 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...
Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal 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,...

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Discovery and Synthesis Optimization of Isoreticular Al(III) Phosphonate-Based Metal-Organic Framework Compounds Using High-Throughput Methods
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Exceptionally high H2 storage by a metal-organic polyhedral framework.

Yong Yan1, Xiang Lin, Sihai Yang

  • 1School of Chemistry, University of Nottingham, University Park, Nottingham, UKNG7 2RD.

Chemical Communications (Cambridge, England)
|February 20, 2009
PubMed
Summary

The novel framework material NOTT-112 achieves high excess hydrogen (H2) uptake. It demonstrates significant H2 storage capacity at cryogenic temperatures, crucial for energy applications.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Energy Storage

Background:

  • Developing advanced materials for efficient hydrogen storage is critical for clean energy technologies.
  • Porous materials, such as metal-organic frameworks (MOFs), offer tunable structures for gas adsorption.

Purpose of the Study:

  • To investigate the hydrogen storage capacity of the desolvated polyhedral framework material NOTT-112.
  • To evaluate its performance at cryogenic temperatures and varying pressures.

Main Methods:

  • Synthesis and characterization of the NOTT-112 framework material.
  • High-pressure hydrogen (H2) gas adsorption measurements at 77 K.

Main Results:

  • The desolvated NOTT-112 material exhibited an excess H2 uptake of 7.07 wt% between 35 and 40 bar at 77 K.
  • A total H2 uptake of 10 wt% was recorded at 77 bar and 77 K, indicating substantial storage capability.

Conclusions:

  • NOTT-112 demonstrates promising hydrogen storage properties at cryogenic conditions.
  • Its polyhedral framework structure contributes to high H2 adsorption capacities, relevant for future hydrogen energy systems.