Jove
Visualize
Contáctanos
JoVE
x logofacebook logolinkedin logoyoutube logo
ACERCA DE JoVE
Visión GeneralLiderazgoBlogCentro de Ayuda JoVE
AUTORES
Proceso de PublicaciónConsejo EditorialAlcance y PolíticasRevisión por ParesPreguntas FrecuentesEnviar
BIBLIOTECARIOS
TestimoniosSuscripcionesAccesoRecursosConsejo Asesor de BibliotecasPreguntas Frecuentes
INVESTIGACIÓN
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchivo
EDUCACIÓN
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualCentro de Recursos para ProfesoresSitio de Profesores
Términos y Condiciones de Uso
Política de Privacidad
Políticas

Videos de Conceptos Relacionados

Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

877
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...
877
EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

2.7K
Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
2.7K
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

1.9K
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
1.9K
Genomic DNA in Eukaryotes00:58

Genomic DNA in Eukaryotes

51.3K
Eukaryotes have large genomes compared to prokaryotes. To fit their genomes into a cell, eukaryotic DNA is packaged extraordinarily tightly inside the nucleus. To achieve this, DNA is tightly wound around proteins called histones, which are packaged into nucleosomes that are joined by linker DNA and coil into chromatin fibers. Additional fibrous proteins further compact the chromatin, which is recognizable as chromosomes during certain phases of cell division.
51.3K
Complementary DNA01:44

Complementary DNA

30.5K
Overview
30.5K
Electron Configuration of Multielectron Atoms03:26

Electron Configuration of Multielectron Atoms

62.8K
The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
62.8K

También podría leer

Artículos Relacionados

Artículos vinculados a este trabajo por autores compartidos, revista y gráfico de citas.

Ordenar por
Same author

Metal-Phenolic Coatings Enable Universal Design of Spherical Nucleic Acids.

Angewandte Chemie (International ed. in English)·2026
Same author

Programmed synthesis of mesoporous protein crystals in cellular reactors.

Nature nanotechnology·2026
Same author

Correction to "DNA-Mediated Cellular Delivery of Functional Enzymes".

Journal of the American Chemical Society·2026
Same author

Author Correction: De novo design of quasisymmetric two-component protein cages.

Nature·2026
Same author

High-χ Block Copolymer Nanoreactors for the Confined Synthesis of Size-Controlled Nanoclusters.

ACS nano·2026
Same author

Programmable Stepwise Heteroepitaxial Growth of Colloidal Crystals With Different Phases.

Advanced materials (Deerfield Beach, Fla.)·2026
Same journal

Radical Cascades on Seawater Microdroplets Drive Atmospheric Mercury Oxidation.

Journal of the American Chemical Society·2026
Same journal

Superior Selective and Fast NH<sub>3</sub> Adsorption of Soft Porous MOF/Ionic Liquid Composites with Ordering Phase Transitions.

Journal of the American Chemical Society·2026
Same journal

Systematic Catalyst Variation for Improved Stereoselective Epoxide Polymerization: Subtle Modifications Resulting in Superior Efficiency.

Journal of the American Chemical Society·2026
Same journal

Deciphering the Halide Chemistry of Cl<sup>-</sup> and Br<sup>-</sup> in Enhancing Kinetics of Mg Plating/Stripping.

Journal of the American Chemical Society·2026
Same journal

Electrosynthesis of C<sub>6</sub> Chemicals by Propylene Oxidative Coupling on Au Surface.

Journal of the American Chemical Society·2026
Same journal

Statistical AI Enables Precise Screening of Multielement Catalysts.

Journal of the American Chemical Society·2026
Ver todos los artículos relacionados

Video Experimental Relacionado

Updated: Nov 20, 2025

DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation
09:26

DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation

Published on: December 29, 2021

4.6K

Valencia equivalente de electrones a través del ADN multivalente bien definido molecularmente

Ho Fung Cheng1, Shunzhi Wang1, Chad A Mirkin1

  • 1Department of Chemistry and International Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States.

Journal of the American Chemical Society
|January 22, 2021
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores crearon nuevos cristales coloidales utilizando equivalentes de electrones molecularmente precisos (EE) y bloques de construcción de nanopartículas. Este avance permite el control de la estructura cristalina y la estabilidad térmica, avanzando en el campo de la materia programable.

Más Videos Relacionados

Author Spotlight: Advancements in DNA Nanosensors &#8211; Addressing Sensitivity and Selectivity Challenges in Molecular Detection
07:16

Author Spotlight: Advancements in DNA Nanosensors – Addressing Sensitivity and Selectivity Challenges in Molecular Detection

Published on: February 9, 2024

1.3K
Electroeluting DNA Fragments
06:13

Electroeluting DNA Fragments

Published on: September 5, 2010

28.2K

Videos de Experimentos Relacionados

Last Updated: Nov 20, 2025

DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation
09:26

DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation

Published on: December 29, 2021

4.6K
Author Spotlight: Advancements in DNA Nanosensors &#8211; Addressing Sensitivity and Selectivity Challenges in Molecular Detection
07:16

Author Spotlight: Advancements in DNA Nanosensors – Addressing Sensitivity and Selectivity Challenges in Molecular Detection

Published on: February 9, 2024

1.3K
Electroeluting DNA Fragments
06:13

Electroeluting DNA Fragments

Published on: September 5, 2010

28.2K

Área de la Ciencia:

  • Ciencia de los coloides y de las interfaces
  • Ciencias de los materiales
  • Nanotecnología

Sus antecedentes:

  • Las nanopartículas funcionalizadas por oligonucleótidos (NP), denominadas equivalentes de átomos programables (PAE), son bloques de construcción para cristales coloidales.
  • Las PAE pueden actuar como equivalentes de electrones (EE), estabilizando las subredes complementarias, pero la polidispersidad NP limita el control de EE.
  • Comprender las interacciones EE-PAE y la metalicidad coloidal es un desafío debido a las variaciones en el injerto de ADN en NPs.

Objetivo del estudio:

  • Desarrollar una estrategia para sintetizar cristales coloidales con EEs molecularmente precisos.
  • Investigar el ensamblaje y las propiedades de los cristales formados por EEs moleculares y PAE basados en NP.
  • Explorar la influencia de la valencia de EE en la formación de fase y las propiedades del cristal.

Principales métodos:

  • EEs sintetizados por moléculas pequeñas con un número preciso de hebras de ADN.
  • EEs moleculares ensambladas con EAP complementarias basadas en NP.
  • Se utilizó la dispersión de rayos X y la microscopía electrónica para caracterizar los cristales coloidales resultantes.

Principales resultados:

  • Formación de tres fases "metálicas" distintas en el ensamblaje de EEs moleculares y NP PAE.
  • Se ha demostrado que la estabilidad térmica depende del número de extremos pegajosos por EE.
  • Se demostró que la simetría de la celosía está controlada por el número y la orientación de los extremos pegajosos de EE en PAE.

Conclusiones:

  • Se introdujeron EEs molecularmente precisos como un método para superar las limitaciones de las EEs basadas en NP.
  • Se estableció que las EEs moleculares poseen una valencia definida, a diferencia de los electrones convencionales.
  • Se ha demostrado que la valencia de EE puede utilizarse para guiar e influir en la formación de fases específicas en cristales coloidales.