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Videos de Conceptos Relacionados

Hydrogen Bonds01:04

Hydrogen Bonds

A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
Hydrogen Bonds00:26

Hydrogen Bonds

Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared.
Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
Alkyl Halides02:45

Alkyl Halides

Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
Valence Bond Theory02:45

Valence Bond Theory

Overview of Valence Bond Theory
Valence Bond Theory02:42

Valence Bond Theory

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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Video Experimental Relacionado

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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
06:44

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

Published on: March 24, 2018

Enlace halógeno amplificado en un espacio pequeño.

Mohammed G Sarwar1, Dariush Ajami, Giannoula Theodorakopoulos

  • 1The Skaggs Institute for Chemical Biology and Department of Chemistry, The Scripps Research Institute , 10550 North Torrey Pines Road, La Jolla, California 92037, United States.

Journal of the American Chemical Society
|September 5, 2013
PubMed
Resumen

Los investigadores utilizaron técnicas de encapsulación para observar directamente las interacciones débiles de enlaces halógenos. Este método prolonga los encuentros moleculares dentro de espacios confinados, lo que permite una caracterización detallada a través de la espectroscopia de RMN.

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Área de la Ciencia:

  • Química supramolecular de las moléculas.
  • Física Química Física Química es la física de la química.

Sus antecedentes:

  • Las fuerzas intermoleculares débiles, como los enlaces halógenos, son difíciles de estudiar en solución debido a las interacciones moleculares transitorias y la interferencia del disolvente.
  • Los entornos confinados, como los sitios activos de las enzimas o las cápsulas sintéticas, pueden estabilizar los complejos moleculares prolongando y pre-organizando los encuentros, aislándolos de los efectos del disolvente a granel.

Objetivo del estudio:

  • Demostrar la utilidad de las técnicas de encapsulación para la observación directa y la caracterización de enlaces halógenos débiles.
  • Para superar las limitaciones de estudiar las interacciones transitorias en solución a granel.

Principales métodos:

  • Empleando técnicas de encapsulación para crear entornos confinados para las interacciones moleculares.
  • Utilizando la espectroscopia de Resonancia Magnética Nuclear (RMN) para la caracterización detallada del complejo encapsulado.

Principales resultados:

  • Observación directa exitosa del enlace halógeno dentro de un espacio confinado.
  • Amplificación de la fuerza de interacción debido al aumento de las concentraciones locales y la alineación favorable dentro de la cápsula.
  • Caracterización de la interacción débil utilizando métodos convencionales de RMN, que sería insignificante en el disolvente a granel.

Conclusiones:

  • La encapsulación proporciona una poderosa estrategia para estabilizar y estudiar las fuerzas intermoleculares débiles como los enlaces halógenos.
  • Este enfoque permite un análisis detallado de las interacciones en condiciones no factibles en los estudios convencionales de la fase de solución.
  • Los hallazgos abren vías para investigar otras interacciones débiles en microambientes personalizados.