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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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Isomerism in Complexes
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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions
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The first bismuth-NHC complexes.

Antonino Aprile1, Robert Corbo, Kel Vin Tan

  • 1Department of Chemistry, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria, Australia. j.dutton@latrobe.edu.au.

Dalton Transactions (Cambridge, England : 2003)
|October 24, 2013
PubMed
Summary
This summary is machine-generated.

Researchers report the first N-heterocyclic carbene (NHC) adducts of bismuth, synthesizing and characterizing these novel compounds. This achievement fills a gap in reporting NHC-element fragments for all non-radioactive elements in groups 13-17.

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Area of Science:

  • Organometallic Chemistry
  • Inorganic Chemistry
  • Materials Science

Background:

  • N-heterocyclic carbenes (NHCs) are versatile ligands in coordination chemistry.
  • Bismuth (Bi) is a heavy p-block element with unique chemical properties.
  • NHC-element fragments are crucial for understanding bonding and reactivity across the periodic table.

Purpose of the Study:

  • To synthesize and characterize the first N-heterocyclic carbene adducts of bismuth.
  • To explore the coordination chemistry of bismuth with NHC ligands.
  • To complete the series of reported NHC-element fragments for non-radioactive p-block elements.

Main Methods:

  • Direct reaction of bismuth(III) chloride (BiCl3) with specific NHC precursors.
  • Isolation and purification of the resulting bismuth-NHC adducts.
  • Crystallographic characterization to determine the molecular structure.

Main Results:

  • Successful synthesis of the first reported N-heterocyclic carbene adducts of bismuth.
  • Crystallographic data confirmed the formation of Bi-NHC bonds.
  • This work represents the final unreported NHC-element fragment among non-radioactive elements in groups 13-17.

Conclusions:

  • The synthesis of bismuth-NHC adducts expands the scope of NHC coordination chemistry.
  • These findings provide fundamental insights into the bonding of heavy p-block elements with NHC ligands.
  • The reported compounds fill a significant gap in the periodic survey of NHC-element chemistry.