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Videos de Conceptos Relacionados

Ionic Crystal Structures02:42

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
Intermolecular Forces03:13

Intermolecular Forces

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 bonds, and dispersion...
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous overlap of p...
Ionic Association01:28

Ionic Association

The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.

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Video Experimental Relacionado

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Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
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Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid

Published on: January 25, 2020

Interacciones catión-anión y estructuras polares en el estado sólido.

Michael R Marvel1, Julien Lesage, Jaewook Baek

  • 1Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, USA.

Journal of the American Chemical Society
|October 20, 2007
PubMed
Resumen

Los cationes de potasio juegan un papel crucial en el empaque acéntrico de los aniones de fluoruro de niobio ([NbOF5]2-) en KNaNbOF5.5. Esto contrasta con CsNaNbOF5, revelando información sobre las estructuras cristalinas y las propiedades físicas.

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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

Published on: March 24, 2018

Área de la Ciencia:

  • Química Inorgánica La Química Inorgánica es la química inorgánica.
  • Química del estado sólido.
  • La cristalografía es una técnica de cristalografía.

Sus antecedentes:

  • Las estructuras complejas con oxígeno y flúor a menudo exhiben propiedades físicas únicas.
  • Las desviaciones de la segunda regla de cristal de Pauling (PSCR) son comunes en estos marcos.
  • La estructura y la unión del anión [NbOF5]2- son claves para comprender las propiedades de los materiales.

Objetivo del estudio:

  • Para investigar el ordenamiento estructural del anión [NbOF5]2- en KNaNbOF5 y CsNaNbOF5.5.
  • Para analizar el papel de los cationes de metales alcalinos (Na+, K+, Cs+) en el empaque y la simetría de estos niobatos.
  • Explorar las desviaciones del PSCR y el modelo de valencia de enlace en relación con la estructura cristalina.

Principales métodos:

  • Difracción de rayos X de un solo cristal para determinar las estructuras cristalinas y los parámetros de la celosía.
  • Análisis de longitudes de enlace (Nb-O, Nb-F) y entornos de coordinación.
  • Aplicación del modelo de valencia de enlace para evaluar las interacciones catión-anión.

Principales resultados:

  • KNaNbOF5 cristaliza en el grupo espacial polar Pna21, con enlaces ordenados Nb-O y Nb-F dentro del anión [NbOF5]2-.
  • CsNaNbOF5 se cristaliza en el grupo espacial centrosimétrico Pbcn.
  • El estudio destaca la influencia significativa de los pequeños cationes de potasio en la disposición no centrosimétrica del anión [NbOF5]2-.

Conclusiones:

  • La presencia y el tamaño de los cationes de metales alcalinos influyen críticamente en la simetría cristalina y en el empaque de los compuestos a base de [NbOF5]2.
  • Las desviaciones de PSCR se observan y se explican por las interacciones específicas catión-anión.
  • Comprender estos matices estructurales es esencial para predecir y ajustar las propiedades físicas de los materiales inorgánicos relacionados.