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Videos de Conceptos Relacionados

Phosphoinositides and PIPs01:42

Phosphoinositides and PIPs

Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
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.
Phosphodiester Linkages01:01

Phosphodiester Linkages

Overview
Phosphodiester bond forms when a phosphoric acid molecule (H3PO4) links with two hydroxyl groups (–OH) of two other molecules, forming two ester bonds. Two water molecules are released in this process. The phosphodiester bond is commonly found in nucleic acids (DNA and RNA) and plays a critical role in their structure and function.
Phosphodiester Bonds Link Nucleotides Together
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Ions as Acids and Bases02:54

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Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
Polyprotic Acids03:38

Polyprotic Acids

Acids are classified by the number of protons per molecule that they can give up in a reaction. Acids such as HCl, HNO3, and HCN that contain one ionizable hydrogen atom in each molecule are called monoprotic acids. Their reactions with water are:
IP3/DAG Signaling Pathway01:11

IP3/DAG Signaling Pathway

Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the  phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and produces two-second...

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Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of Phosphorus(I)
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Los iones de 2,3-difosfino-1,4-difosfonio se encuentran en el 2,3-difosfino-1,4-difosfonio.

Yuen-ying Carpenter1, C Adam Dyker, Neil Burford

  • 1Department of Chemistry, Dalhousie University, Halifax, NS, B3H 4J3, Canada.

Journal of the American Chemical Society
|October 23, 2008
PubMed
Resumen

Los investigadores sintetizaron nuevas sales de clorofosfinodifosfonio, lo que condujo a los primeros iones acíclicos difosfino-difosfonio. Este avance avanza en la química catena-fosforo y revela nuevos conocimientos sobre la unión.

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Área de la Ciencia:

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

Sus antecedentes:

  • La química del fósforo explora uniones y estructuras únicas.
  • Los compuestos de catena-fosforo, con enlaces P-P, son cruciales para el desarrollo de nuevos materiales y catalizadores.
  • Comprender la síntesis y las propiedades de los cationes polifosforados es un desafío continuo.

Objetivo del estudio:

  • Para sintetizar y caracterizar las primeras sales de clorofosfinophosphonium definidas cristalográficamente.
  • Investigar el acoplamiento reductor de estas sales para formar nuevos iones acíclicos difosfino-difosfonio.
  • Para explorar el enlace y la reactividad de estos nuevos marcos de fósforo.

Principales métodos:

  • Preparación y caracterización cristalográfica de las sales de clorofosfinophosphonium.
  • Reacciones de acoplamiento reductor con fosfinas terciarias (por ejemplo, Ph3P).
  • Síntesis diastereoselectiva de una sola vasija utilizando diclorfosfinas, fosfinas terciarias y sulfonato de trimetilsililtrifluorometano.
  • El análisis espectroscópico (NMR, etc.) y estudios computacionales.

Principales resultados:

  • Síntesis exitosa de las primeras sales de clorofosfinophosphonium caracterizadas cristalográficamente.
  • Formación de los primeros iones acíclicos 2,3-difosfino-1,4-difosfonio a través del acoplamiento reductor.
  • Caracterización de las nuevas sales con la fórmula general [R3P-PR'-PR'-PR3][OTf]2.
  • Demostración del intercambio cuantitativo de ligandos, destacando el carácter coordinador de los enlaces P-P en los sistemas fosfina-fosfonio.
  • Interpretación de estructuras de estado sólido utilizando métodos computacionales.

Conclusiones:

  • El estudio presenta un avance significativo en la química catena-fosforo.
  • Los recién sintetizados iones difosfino-difosfonio representan un marco clave para futuras investigaciones.
  • Los hallazgos proporcionan información crucial sobre los modelos de enlace de cationes ricos en fósforo y su química de coordinación.