Video Experimental Relacionado
Updated: Jun 8, 2026
16:24
Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
Published on: August 2, 2012
Un enfoque de sistemas para controlar la arquitectura supramolecular y las propiedades de la solución emergente a
Dezhi Jiao1, Frank Biedermann, Feng Tian
1Melville Laboratory for Polymer Synthesis, Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, United Kingdom.
Journal of the American Chemical Society
|October 16, 2010
Resumen
Los líquidos iónicos de arilo/alquilo imidazolio se autoensamblan en el agua, aumentando la viscosidad. Las moléculas macrocíclicas del huésped, las urilas de cucurbita (CB[n]), controlan con precisión estos ensamblajes supramoleculares y las propiedades de la solución.
Área de la Ciencia:
- Química supramolecular de las moléculas.
- Ciencia de los materiales Ciencia de los materiales.
Sus antecedentes:
- Los líquidos iónicos (ILs) muestran autoensamblaje en soluciones acuosas.
- Las interacciones hidrofóbicas y π-π impulsan la formación de pilas 1D.
- Este autoensamblaje tiene un impacto significativo en la viscosidad de la solución.
Objetivo del estudio:
- Para investigar el comportamiento de ensamblaje de las sales líquidas iónicas de arilo/alquilo imidazolio en agua.
- Para explorar la influencia de las moléculas macrocíclicas del huésped, cucurbit[n]urils (CB[n]), en el autoensamblaje de IL.
- Comprender cómo la estequiometría huésped-huésped afecta las estructuras supramoleculares y la viscosidad.
Principales métodos:
- Estudios dependientes de la concentración de las soluciones líquidas iónicas.
- Adición de cucurbit[n]urils (CB[7] y CB[8]) a las soluciones líquidas iónicas.
- Mediciones de viscosidad y tamaño de agregación.
- Estudios invitados competitivos para modificar las arquitecturas agregadas.
Principales resultados:
- Las sales líquidas iónicas se autoensamblan en pilas 1D, aumentando la viscosidad.
- CB[7] (1:1 complicación) dramáticamente aumentó la viscosidad y el tamaño de la agregación.
- CB[8] (2:1 complicación) disminuyó significativamente la viscosidad y el tamaño de la agregación.
- Las arquitecturas agregadas eran sintonizables usando invitados competitivos.
Conclusiones:
- Cucurbit[n]urils modulan efectivamente el autoensamblaje del líquido iónico y las propiedades de la solución a través de una estequiometría específica de huésped-invitado.
- Este sistema supramolecular controlable tiene aplicaciones potenciales en sensores moleculares, modificadores de viscosidad y sistemas de liberación controlada.
Videos de Conceptos Relacionados
02:05Entropy and Solvation
The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ ≥ 15); an...
03:13Intermolecular Forces
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen bonds, and dispersion...
01:23Complexation Equilibria: Overview
Complexation reactions take place when dative or coordinate covalent bonds form between metal ions and ligands. The compounds formed in these reactions are called coordination compounds. The number of bonds formed between the metal ion and the ligands is called its coordination number. Generally, most metal ions in an aqueous solution are solvated by water molecules and thus exist as aqua complexes.
The equilibrium constant of the complexation reaction is represented as the formation constant...
The equilibrium constant of the complexation reaction is represented as the formation constant...
02:28Intermolecular Forces in Solutions
The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...
01:09Complexation 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...
03:00Solubility
Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules, atoms, and/or ions)...
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules, atoms, and/or ions)...