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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...
Structures of Solids02:22

Structures of Solids

Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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...
Unit Cells01:18

Unit Cells

A crystal's internal structure is an orderly array of atoms, ions, or molecules, and the details of this array significantly influence the solid's properties. In a crystal, periodically repeating 'structural motifs' - which could be atoms, molecules, or groups thereof - create a 'space lattice.' This is essentially a three-dimensional, infinite array of points, each surrounded by its neighbors in an identical way, forming the basic structure of the crystal.A 'unit cell' is a theoretical...
Structure of Amines01:19

Structure of Amines

The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’ carbon–carbon bond (154 pm). These aspects are illustrated in Figure...
X-ray Crystallography02:18

X-ray Crystallography

The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...

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Video Experimental Relacionado

Updated: Jul 11, 2026

Organic Structure-directing Agent-free Synthesis for *BEA-type Zeolite Membrane
08:49

Organic Structure-directing Agent-free Synthesis for *BEA-type Zeolite Membrane

Published on: February 22, 2020

La estructura de la abelsonita es la siguiente:

C B Storm, J Krane, T Skjetne

    Science (New York, N.Y.)
    |March 9, 1984
    PubMed
    Resumen
    Este resumen es generado por máquina.

    La abelsonita, una níquel-porfirina, tiene una estructura confirmada de C31 desoxofiloeritroetioporfirina con ubicaciones específicas de grupos metilo y etilo. El análisis geoquímico sugiere su origen en la clorofila.

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    Área de la Ciencia:

    • La geoquímica es la geoquímica.
    • Química orgánica es la química orgánica.
    • Paleontología Paleontología.

    Sus antecedentes:

    • La Abelsonita es una C31 níquel-porfirina que se encuentra en muestras geológicas.
    • Su estructura molecular precisa y su origen han sido objeto de investigación científica.

    Objetivo del estudio:

    • Para dilucidar la estructura molecular detallada de la abelsonita.
    • Para investigar los orígenes geoquímicos de la abelsonita.

    Principales métodos:

    • Espectroscopia de resonancia magnética nuclear (1H NMR) de protones de alta resolución y alto campo.
    • Estudios sobre el efecto del reacondicionador nuclear (NOE, por sus siglas en inglés).
    • Demetallación mediante el uso de ácido metanesulfónico.

    Principales resultados:

    • Se confirmó la estructura C31 níquel-porfirina de la abelsonita.
    • Se identificaron grupos metilo en las posiciones 2, 3, 7, 12 y 18.
    • Se identificaron grupos etílicos en las posiciones 8 y 17.
    • La porfirina de base libre mantuvo la integridad estructural después de la eliminación del níquel.

    Conclusiones:

    • Se ha determinado definitivamente la estructura detallada de la abelsonita.
    • Los hallazgos estructurales apoyan la hipótesis de que la abelsonita se deriva geoquímicamente de la clorofila.