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Related Concept Videos

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...
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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...
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
Structural Isomerism02:34

Structural Isomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
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Coordination Number and Geometry02:57

Coordination Number and Geometry

For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.

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Related Experiment Video

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Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
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Vanadium polyoxoanion-bridged macrocyclic metal complexes: from one-dimensional to three-dimensional structures.

Guang-Chuan Ou1, Long Jiang, Xiao-Long Feng

  • 1MOE Key Laboratory of Bioinorganic and Synthetic Chemistry/State Key Laboratory of Optoelectronic Materials and Technologies/School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou, 510275, China.

Dalton Transactions (Cambridge, England : 2003)
|December 17, 2008
PubMed
Summary

This study synthesized four novel coordination polymers using transition metal macrocyclic complexes and ammonium metavanadate. Diverse vanadium polyoxoanions were formed, leading to varied structural architectures, including 1D chains, 2D sheets, and 3D frameworks.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Coordination Chemistry

Background:

  • Transition metal macrocyclic complexes offer versatile platforms for constructing advanced materials.
  • Vanadium-oxygen clusters (polyoxoanions) exhibit diverse structures and reactivity.
  • Controlling the assembly of metal complexes and polyoxoanions is key to designing novel coordination polymers.

Purpose of the Study:

  • To synthesize and characterize novel coordination polymers derived from transition metal macrocyclic complexes and ammonium metavanadate.
  • To investigate the influence of reaction conditions on the formation of diverse vanadium polyoxoanions.
  • To elucidate the structural diversity and dimensionality of the resulting coordination polymers.

Main Methods:

  • Reaction of four-coordinated transition metal macrocyclic complexes ([ML](ClO(4))(2), L = 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane, M = Ni, Cu) with NH(4)VO(3).
  • Single crystal X-ray diffraction analysis for structural determination.
  • Crystallographic studies to analyze the connectivity and dimensionality of the coordination polymers.

Main Results:

  • Four coordination polymers were synthesized: {[(CuL)(0.5)(H2L)(1.5)][H2V10O2)] x 6H(2)O}(n) (1), {[NiL](3)[V16O38(H2O)] x 6H(2)O}(n) (2), {[NiL][VO(3)](2) x 0.33H2O}(n) (3), and {[CuL][VO(3)](2) x 0.33H2O}(n) (4).
  • Diverse vanadium polyoxoanions, including a [H2V10O28](4-) cluster, a [V16O38(H2O)](6-) cage, a [V6O18](6-) ring, and [VO(3)](n)(n-) chains, were obtained.
  • The complexes exhibit varied structures: 1D chain (1), 2D sheet (2), and 3D frameworks (3, 4) with 1D channels in 3 and 4.

Conclusions:

  • The reaction conditions significantly influence the formation of different vanadium polyoxoanions and the resulting coordination polymer structures.
  • The study demonstrates the versatility of transition metal macrocyclic complexes in constructing diverse inorganic frameworks.
  • The synthesized coordination polymers showcase unique structural motifs and potential for hosting guest molecules within their channels.