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Related Concept Videos

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.
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...
Valence Bond Theory02:42

Valence 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...
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...
π Molecular Orbitals of the Allyl Cation and Anion01:18

π Molecular Orbitals of the Allyl Cation and Anion

An allyl group is a three-carbon conjugated system where the sp³-hybridized allylic carbon is bonded to a CH=CH2 group via a single bond. Allyl anions can be obtained by treating propene with a strong base that can deprotonate methyl groups. Allyl cations are formed as intermediates during substitution reactions involving allylic halides. In both cases, the hybridization of the allylic carbon changes from sp3 to sp2, giving rise to a carbon chain with three sp2-hybridized carbons, each with an...
MO Theory and Covalent Bonding02:40

MO Theory and Covalent Bonding

The molecular orbital theory describes the distribution of electrons in molecules in a manner similar to the distribution of electrons in atomic orbitals. The region of space in which a valence electron in a molecule is likely to be found is called a molecular orbital. Mathematically, the linear combination of atomic orbitals (LCAO) generates molecular orbitals. Combinations of in-phase atomic orbital wave functions result in regions with a high probability of electron density, while...

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Related Experiment Video

Updated: Jun 8, 2026

Surface Functionalization of Metal-Organic Frameworks for Improved Moisture Resistance
08:12

Surface Functionalization of Metal-Organic Frameworks for Improved Moisture Resistance

Published on: September 5, 2018

Cubic polyoxometalate-organic molecular cage.

Shou-Tian Zheng1, Jie Zhang, Xin-Xiong Li

  • 1State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China.

Journal of the American Chemical Society
|October 7, 2010
PubMed
Summary

Tris(hydroxymethyl)aminomethane (Tris) was grafted onto polyoxotungstate, creating a new building block. This enabled the formation of a stable, cubic polyoxometalate-organic molecular cage through cooperative assembly.

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Supramolecular Chemistry

Background:

  • Polyoxometalates (POMs) are versatile inorganic clusters with tunable properties.
  • Functionalization of POM surfaces is key to creating advanced materials.
  • Developing novel molecular architectures with enhanced stability is a significant challenge.

Purpose of the Study:

  • To functionalize a Ni(6)-substituted polyoxotungstate with Tris(hydroxymethyl)aminomethane (Tris).
  • To utilize the functionalized POM as a building block for constructing complex structures.
  • To synthesize and characterize a novel polyoxometalate-organic molecular cage.

Main Methods:

  • In situ synthesis of Ni(6)-substituted polyoxotungstate.
  • Grafting of Tris(hydroxymethyl)aminomethane onto the POM surface.
  • Cooperative assembly with 1,3,5-benzenetricarboxylate.

Main Results:

  • Successful grafting of Tris onto the polyoxotungstate surface.
  • Generation of a three-connected polyoxometalate building block.
  • Formation of an unprecedented cubic polyoxometalate-organic molecular cage.

Conclusions:

  • Tris functionalization provides a route to novel POM building blocks.
  • The resulting cubic cage exhibits high thermal and hydrothermal stability.
  • This work expands the possibilities for designing POM-based supramolecular architectures.