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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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Complexation Equilibria: Overview01:23

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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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Intermolecular Forces03:13

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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Complexometric Titration: Ligands00:43

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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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The reaction between a Brønsted-Lowry acid and water is called acid ionization. For example, when hydrogen fluoride dissolves in water and ionizes, protons are transferred from hydrogen fluoride molecules to water molecules, yielding hydronium ions and fluoride ions:
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Complexation Equilibria: The Chelate Effect01:19

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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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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Complejo de agua de imidógeno

Xiaolong Li1, Bo Lu1, Junjie Jiang1

  • 1Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysts and Innovative Materials, Fudan University, 200433 Shanghai, China.

Journal of the American Chemical Society
|January 12, 2023
PubMed
Resumen

Los investigadores observaron el hidrógeno de nitrógeno más simple, imidógeno (NH), complejo con agua. Este descubrimiento arroja luz sobre el mecanismo de reacción de amidación y proporciona información sobre la química interestelar.

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Área de la Ciencia:

  • Física Química
  • Astroquímica
  • Mecanismos de reacción

Sus antecedentes:

  • El imidógeno (NH) es el hidruro de nitrógeno más simple, crucial en la combustión y la química interestelar.
  • La reacción de NH con agua es un modelo para la amidación de enlaces O-H a través de un intermediario de nitreno.

Objetivo del estudio:

  • Observar y caracterizar el elusivo complejo de agua del imidógeno (NH).
  • Para aclarar el mecanismo de la reacción NH + H2O, un proceso clave de amidación.

Principales métodos:

  • Espectroscopia de aislamiento de matriz (matriz N2 a 10 K).
  • Espectroscopia infrarroja (IR) con etiquetado isotópico (D, 18O, 15N).
  • Los cálculos químicos cuánticos (UCCSD) / aug-cc-pVQZ).

Principales resultados:

  • El complejo de agua del imidógeno, NH··OH2, se observó con éxito como un complejo de pre-reacción.
  • Los datos espectroscópicos y computacionales confirmaron la estructura de enlace de hidrógeno.
  • La fotólisis del complejo a 365 nm indujo la inserción de enlaces O-H, formando hidroxilamina (NH2OH).

Conclusiones:

  • El estudio proporciona pruebas directas del complejo de pre-reacción NH·H2O.
  • Los hallazgos validan el mecanismo propuesto para la amidación NH-agua.
  • Esta investigación hace avanzar la comprensión de las reacciones químicas fundamentales relevantes para la combustión y la astroquímica.