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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

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Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...

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Homonuclear correlation spectroscopy, or COSY, is a 2-dimensional NMR technique that provides information about coupled protons. Typically, the geminal and vicinal coupling are observed. For example, consider the COSY spectrum of ethyl acetate, where its 1D proton NMR spectrum is plotted along the vertical and horizontal axes with their corresponding chemical shift scale. Three spots on the diagonal corresponding to the three peaks in the 1D proton spectrum are called diagonal peaks. The COSY...

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Updated: Jun 20, 2026

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

Published on: May 15, 2017

Hemicyanine monolayer orientation studied by second-harmonic generation.

G Marowsky, R Steinhoff

|September 12, 2009

Summary

Researchers studied hemicyanine monolayers using polarization-dependent methods. They observed how molecular orientation and aggregate formation change with wavelength and diluting agents.

Area of Science:

Materials Science
Physical Chemistry
Spectroscopy

Background:

Hemicyanine dyes are valuable for nonlinear optical properties.
Understanding molecular orientation in monolayers is crucial for device applications.
Aggregate formation can significantly alter material properties.

Purpose of the Study:

To investigate the molecular orientation of hemicyanine monolayers.
To explore the influence of aggregate formation on molecular tilt angles.
To examine the effect of diluting agents on aggregate mobilization.

Main Methods:

Utilized a novel scheme of polarization-dependent excitation and detection.
Performed wavelength-dependent measurements of molecular tilt angles.

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Last Updated: Jun 20, 2026

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

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Published on: May 15, 2017

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

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Analyzed aggregate formation and mobilization using dilution with arachidic acid.

Main Results:

The study successfully determined the molecular orientation of hemicyanine monolayers.
Wavelength-dependent measurements revealed details of aggregate formation.
Mobilization of aggregates was observed upon addition of diluting agents like arachidic acid.

Conclusions:

Polarization-dependent spectroscopy provides insights into molecular ordering in hemicyanine monolayers.
Aggregate dynamics are influenced by both intrinsic factors and external agents.
This research contributes to the understanding of self-assembled monolayers for optical applications.