Video Experimental Relacionado
Updated: May 10, 2026
16:24
Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
Published on: August 2, 2012
Controlar las conformaciones de polímeros conjugados y moléculas pequeñas: el papel de las interacciones no
Nicholas E Jackson1, Brett M Savoie, Kevin L Kohlstedt
1Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States. nicholasjackson2016@u.northwestern.edu
Journal of the American Chemical Society
|June 27, 2013
Resumen
Se estudiaron las interacciones no de unión en la electrónica orgánica. Los enlaces específicos de hidrógeno (CH··O y CH···N) controlan de manera única la conformación y la planaridad del polímero y de las moléculas pequeñas a temperatura ambiente.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Química orgánica es la química orgánica.
- Química computacional es la química computacional.
Sus antecedentes:
- La electrónica orgánica utiliza diversas estructuras químicas.
- Los esquemas de "bloqueo" de conformidad son cruciales para el rendimiento del material.
- Las interacciones no vinculantes a menudo se exploran para el control estructural.
Objetivo del estudio:
- Investigar las interacciones no de unión en la electrónica orgánica.
- Evaluar las interacciones como oxígeno-azufre, nitrógeno-azufre y flúor-azufre.
- Identificar las interacciones que inducen el control conformacional y la planaridad.
Principales métodos:
- Métodos precisos de la función de onda cuántico-química.
- Análisis de las interacciones no covalentes (ICN).
- Examen de polímeros conjugados y moléculas pequeñas.
Principales resultados:
- Muchas interacciones no vinculantes exhiben una unión débil.
- Se identificaron enlaces de hidrógeno no tradicionales (CH··O y CH···N).
- Estos enlaces de hidrógeno específicos inducen el control conformacional y mejoran la planaridad.
Conclusiones:
- Las interacciones CH···O y CH···N son clave para el control de la conformación en los materiales orgánicos.
- Estas interacciones mejoran la planaridad de la columna vertebral a temperatura ambiente.
- La comprensión de estas interacciones no vinculantes es vital para el diseño de materiales electrónicos orgánicos de alto rendimiento.
Videos de Conceptos Relacionados
02:35Noncovalent Attractions in Biomolecules
Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
02:35Noncovalent Attractions in Biomolecules
Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
02:11Conformations of Cyclohexane
Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal tetrahedral value,...
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal tetrahedral value,...
02:18Conformations of Ethane and Propane
In an organic molecule, free rotation about the carbon-carbon single bond results in energetically different conformers of the molecule. Due to this rotation, called the internal rotation, ethane has two major conformations — staggered and eclipsed.
Staggered conformation is a low energy and more stable conformation with the C-H bonds on the front carbon placed at 60°dihedral angles relative to the C-H bonds on the back carbon, leading to a reduced torsional strain. In staggered ethane, the...
Staggered conformation is a low energy and more stable conformation with the C-H bonds on the front carbon placed at 60°dihedral angles relative to the C-H bonds on the back carbon, leading to a reduced torsional strain. In staggered ethane, the...
00:52¹H NMR of Conformationally Flexible Molecules: Temporal Resolution
At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
02:06Newman Projections
Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as conformers.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as conformers.