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Coordination Number and Geometry02:57

Coordination Number and Geometry

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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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In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
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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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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.
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Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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Coordination polymers of uranium(IV) terephthalates.

Clément Falaise1, Ayalew Assen, Ionut Mihalcea

  • 1Unité de Catalyse et Chimie du Solide (UCCS) - UMR CNRS 8181, Université de Lille Nord de France, USTL-ENSCL, Bat C7, BP 90108, 59652 Villeneuve d'Ascq, France. christophe.volkringer@ensc-lille.fr.

Dalton Transactions (Cambridge, England : 2003)
|November 28, 2014
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Summary

Researchers synthesized novel tetravalent uranium terephthalates using solvothermal methods. The study details the formation of diverse 2D and 3D coordination polymers, influenced by temperature and water content, expanding knowledge of uranium-based materials.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Coordination Chemistry

Background:

  • Uranium-based coordination polymers offer unique structural diversity and potential applications.
  • Understanding the synthesis-structure-property relationships is crucial for designing advanced materials.
  • Solvothermal synthesis provides a versatile route for creating complex inorganic frameworks.

Purpose of the Study:

  • To explore the solvothermal synthesis of tetravalent uranium terephthalates.
  • To investigate the influence of reaction parameters (temperature, water presence) on the resulting crystal structures.
  • To characterize the diverse coordination polymer architectures formed.

Main Methods:

  • Solvothermal synthesis using N,N-dimethylformamide (DMF) as solvent.
  • Systematic variation of temperature (100-150 °C) and water content.
  • Crystallographic analysis to determine the structures of synthesized uranium compounds.

Main Results:

  • Formation of two- and three-dimensional uranium terephthalate coordination polymers.
  • Identification of different polytypes (T-U2Cl2(bdc)3(DMF)4 and M-U2Cl2(bdc)3(DMF)4) in the absence of water.
  • Synthesis of layered U2(bdc)4(DMF)4 and chain-like U2O2(bdc)2(DMF) structures with controlled water addition, alongside UiO-66-like and urania phases.

Conclusions:

  • The synthesis of tetravalent uranium terephthalates is highly sensitive to temperature and water concentration.
  • Diverse structural motifs, including 3D frameworks, 2D sheets, and 1D chains, can be accessed.
  • This work provides a foundation for the rational design of uranium-based coordination polymers with tunable structures.