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Formation of Complex Ions03:45

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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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...
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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

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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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Complexation reactions take place when dative or coordinate covalent bonds form between metal ions and ligands. The compounds formed in these reactions are called coordination compounds. The number of bonds formed between the metal ion and the ligands is called its coordination number. Generally, most metal ions in an aqueous solution are solvated by water molecules and thus exist as aqua complexes.
The equilibrium constant of the complexation reaction is represented as the formation constant...
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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...
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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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Complejación y reducción de dinitrógeno en calcio de baja valencia

B Rösch1, T X Gentner1, J Langer1

  • 1Inorganic Chemistry, University Erlangen-Nürnberg, 91058 Erlangen, Germany.

Science (New York, N.Y.)
|March 12, 2021
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores exploraron complejos de calcio de baja valencia bajo una atmósfera de nitrógeno (N2). Aislaron un nuevo complejo, LCa(N2) CaL, que sirve como precursor para el compuesto deseado de calcio ((I).

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Área de la Ciencia:

  • Química inorgánica
  • Química organometálica
  • Ciencias de los materiales

Sus antecedentes:

  • Los complejos metálicos del grupo principal de baja valencia son de gran interés por su reactividad única.
  • La activación del dinitrógeno (N2) por complejos metálicos es un desafío clave en química, con implicaciones para la fijación del nitrógeno.
  • Los ligandos voluminosos a menudo se emplean para estabilizar los centros metálicos reactivos de baja valencia.

Objetivo del estudio:

  • Para sintetizar y caracterizar los complejos de calcio de baja valencia.
  • Investigar la reactividad del nitrógeno (N2) coordinado con el calcio.
  • Explorar el potencial de estos complejos como síntonos para otras especies de calcio de baja valencia.

Principales métodos:

  • Intento de síntesis de complejos de calcio de baja valencia (LCa-CaL) bajo nitrógeno (N2).
  • Caracterización cristalográfica del complejo de dinitrógeno aislado.
  • Investigación de la reactividad del anión coordinado de nitrógeno (N2^2-).

Principales resultados:

  • Aislamiento y caracterización cristalográfica del LCa ((N2) CaL.
  • El anión de nitrógeno (N2 ^ 2-) demostró potentes capacidades de donante de dos electrones.
  • LCa ((N2) CaL se identificó como un sintón para el complejo objetivo de calcio ((I) de baja valencia, LCa-CaL.
  • La protonación del anión N2^2 condujo al diazeno (N2H2), que se desproporcionó.

Conclusiones:

  • LCa ((N2) CaL es un complejo estable que sirve como un sintón valioso para la química de calcio ((I)) de baja valencia.
  • El anión de dinitrógeno coordinado exhibe una reactividad versátil, actuando como un donante de electrones fuerte y sometido a protonación.
  • El estudio proporciona información sobre el papel de los orbitales de calcio d en la activación del nitrógeno.