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Videos de Conceptos Relacionados

Periodic Classification of the Elements04:00

Periodic Classification of the Elements

The periodic table arranges atoms based on increasing atomic number so that elements with the same chemical properties recur periodically. When their electron configurations are added to the table, a periodic recurrence of similar electron configurations in the outer shells of these elements is observed. Because they are in the outer shells of an atom, valence electrons play the most important role in chemical reactions. The outer electrons have the highest energy of the electrons in an atom...
Metallic Solids02:37

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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...
Newman Projections02:06

Newman Projections

Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as conformers.
Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.

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Gyroid Nickel Nanostructures from Diblock Copolymer Supramolecules
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Published on: April 28, 2014

Un uranyl metalomesogenogeno parecido a una hélice.

Thomas Cardinaels1, Jan Ramaekers, Daniel Guillon

  • 1Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium.

Journal of the American Chemical Society
|December 15, 2005
PubMed
Resumen

El triflato de uranyl y un ligando de fenantrolina forman un complejo similar a una hélice que induce una mesofase columnar hexagonal. Este complejo exhibe propiedades únicas de cristal líquido que no están presentes en el ligando solo.

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Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • Química supramolecular de las moléculas.
  • La cristalografía es una técnica de cristalografía.

Sus antecedentes:

  • Los ligandos imidazo[4,5-f]-1,10-fenantrolina son conocidos por sus propiedades de coordinación.
  • Las sales de uranilo se utilizan con frecuencia en la química de coordinación.
  • Las fases líquido-cristalinas son de interés para aplicaciones de materiales avanzados.

Objetivo del estudio:

  • Para sintetizar y caracterizar un nuevo complejo de uranyl con imidazo [4,5-f]-1,10-fenantrolina.
  • Para investigar las propiedades líquido-cristalinas del complejo resultante.
  • Para comprender la base estructural de la mesofase observada.

Principales métodos:

  • Formación compleja entre el triflato de uranilo y el ligando de la fenantrolina.
  • Microscopía óptica polarizante para la observación de la mesofase.
  • Difracción de rayos X a alta temperatura para el análisis estructural.

Principales resultados:

  • Se sintetizó con éxito un complejo de uranyl similar a una hélice.
  • El complejo exhibe una mesofase columnar hexagonal.
  • La mesofase es inducida por la formación de complejos, que no están presentes en el ligando libre.
  • Se propuso un modelo de apilamiento molecular para la mesofase.

Conclusiones:

  • La complejación de uranyl con imidazo [4,5-f]-1,10-fenantrolina induce una fase líquido-cristalina columnar hexagonal.
  • La estructura del ligando es crucial para la formación de la mesofase tras la complejación.
  • El estudio proporciona información sobre las relaciones estructura-propiedad en los cristales líquidos basados en la coordinación.