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Videos de Conceptos Relacionados

Formation of Complex Ions03:45

Formation of Complex Ions

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...
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...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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...
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

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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[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
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[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst

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Complejos simples de Cu (I) con una vida útil sin precedentes en el estado excitado.

Douglas G Cuttell1, Shan-Ming Kuang, Phillip E Fanwick

  • 1Department of Chemistry, Purdue University, 1393 Brown Building,West Lafayette, Indiana 47907-1393, USA.

Journal of the American Chemical Society
|January 5, 2002
PubMed
Resumen

Nuevos complejos de cobre ((I) con ligandos de éter bis[2- ((difenilfosfino) fenilo] muestran emisiones de alto rendimiento cuántico de larga duración en solución. Estos hallazgos son significativos para el desarrollo de materiales luminiscentes avanzados.

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Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides
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Área de la Ciencia:

  • Química Inorgánica La Química Inorgánica es la química inorgánica.
  • Ciencia de los materiales Ciencia de los materiales.
  • La fotoquímica es la fotoquímica.

Sus antecedentes:

  • Los complejos de cobre ((I) son conocidos por sus propiedades luminiscentes.
  • El desarrollo de emisores estables y eficientes en solución fluida sigue siendo un desafío.

Objetivo del estudio:

  • Para sintetizar y caracterizar nuevos complejos de cobre.
  • Para investigar sus propiedades fotofísicas, centrándose en el tiempo de vida de la emisión y el rendimiento cuántico.

Principales métodos:

  • Síntesis de complejos [Cu(NN) ((POP) ]+ donde NN = fen, dmp o dbp.
  • Caracterización mediante cristalografía de rayos X y voltametría cíclica.
  • Mediciones fotofísicas en solución, incluido el rendimiento cuántico de emisión y la determinación de la vida útil del estado excitado.

Principales resultados:

  • Con éxito sintetizó complejos de cobre fácilmente accesibles.
  • Se confirmó la geometría de coordinación pseudo-tetraédrica.
  • Altos rendimientos cuánticos de emisión (0.15-0.16) y largas vidas en estado excitado (14.3-16.1 μs) observados en el diclorometano.
  • Tiempos de vida de emisión significativos (2.4-5.4 μs) retenidos en el metanol, un disolvente coordinador.

Conclusiones:

  • Los nuevos complejos de cobre exhiben una luminiscencia robusta en solución fluida.
  • Estos complejos demuestran potencial para aplicaciones en tecnologías basadas en la luminiscencia.
  • La estabilidad de la emisión en los disolventes coordinadores amplía su aplicabilidad.