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Related Concept Videos

Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse.
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
Molecular Geometry and Dipole Moments02:36

Molecular Geometry and Dipole Moments

The VSEPR theory can be used to determine the electron pair geometries and molecular structures as follows:
Induced Electric Dipoles01:28

Induced Electric Dipoles

A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.
Molecular Shape and Polarity03:37

Molecular Shape and Polarity

Dipole Moment of a Molecule

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Related Experiment Video

Updated: Jun 21, 2026

Spatial Separation of Molecular Conformers and Clusters
10:37

Spatial Separation of Molecular Conformers and Clusters

Published on: January 9, 2014

Ordering in two-dimensional dipolar mixtures.

Julia Fornleitner1, Federica Lo Verso, Gerhard Kahl

  • 1Center for Computational Materials Science, Technische Universitat Wien, Vienna, Austria. fornleitner@cmt.tuwien.ac.at

Langmuir : the ACS Journal of Surfaces and Colloids
|July 15, 2009
PubMed
Summary
This summary is machine-generated.

Two-dimensional dipolar mixtures of spherical particles with varying susceptibilities can form diverse crystalline structures. These structures

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Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
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Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone

Published on: February 23, 2017

Related Experiment Videos

Last Updated: Jun 21, 2026

Spatial Separation of Molecular Conformers and Clusters
10:37

Spatial Separation of Molecular Conformers and Clusters

Published on: January 9, 2014

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
08:06

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone

Published on: February 23, 2017

Area of Science:

  • Condensed matter physics
  • Materials science
  • Statistical mechanics

Background:

  • Dipolar interactions in two-dimensional systems are crucial for understanding emergent crystalline phases.
  • Controlling particle properties like susceptibility is key to tuning material behavior.

Purpose of the Study:

  • To explore the vast array of crystalline structures formed by two-dimensional dipolar mixtures.
  • To investigate how stoichiometry, susceptibility ratio, and density influence these structures.
  • To identify energetically degenerate structures for potential material design.

Main Methods:

  • Utilized genetic algorithms for efficient and unbiased exploration of the parameter space.
  • Simulated two-dimensional systems of spherical particles with unequal magnetic susceptibilities.

Main Results:

  • Discovered an enormous variety of crystalline structures in two-dimensional dipolar mixtures.
  • Demonstrated that crystal geometry is tunable via stoichiometry, susceptibility ratio, and density.
  • Identified practically energetically degenerate structures across various parameter combinations.

Conclusions:

  • The tunability of crystalline structures in these systems offers pathways to control material properties.
  • Implications for tuning phononic spectra in composite materials are significant.