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Related Concept Videos

2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other axis.
2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

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

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...
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...
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to the...
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
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.

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Dual-Color Fluorescence Cross-Correlation Spectroscopy to Study Protein-Protein Interaction and Protein Dynamics in Live Cells
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Correlated driving and dissipation in two-dimensional spectroscopy.

Jian Xu1, Hou-Dao Zhang, Rui-Xue Xu

  • 1Department of Chemistry, Hong Kong University of Science and Technology, Kowloon, Hong Kong. xujian@ust.hk

The Journal of Chemical Physics
|January 17, 2013
PubMed
Summary

The Correlated Driving-Dissipation Equation (CODDE) accurately simulates optical spectroscopy by accounting for driving-dissipation correlations. This method is efficient for light-harvesting complexes, outperforming traditional Redfield theory.

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Area of Science:

  • Quantum optics
  • Spectroscopy
  • Theoretical chemistry

Background:

  • Coherent driving and non-Markovian dissipation are crucial in optical processes.
  • Conventional Redfield theory has limitations in simulating complex optical phenomena.

Purpose of the Study:

  • To explore the Correlated Driving-Dissipation Equation (CODDE) for simulating optical spectroscopy.
  • To compare CODDE with Redfield theory and exact hierarchical dynamics.
  • To develop a dynamical inhomogeneity parameter for CODDE's applicability.

Main Methods:

  • Utilized an exciton model of the Fenna-Matthews-Olson pigment-protein complex.
  • Compared linear absorption and coherent two-dimensional spectroscopy results from Redfield theory, CODDE, and exact hierarchical dynamics.
  • Developed a mixed Heisenberg-Schrödinger picture scheme for nonlinear response functions.

Main Results:

  • CODDE accurately simulates optical spectroscopy, outperforming Redfield theory.
  • The failure of Redfield theory is attributed to neglecting driving-dissipation correlation.
  • A dynamical inhomogeneity parameter quantifies CODDE's applicable range.
  • CODDE is efficient and quantifiable for light-harvesting complexes.

Conclusions:

  • CODDE is a robust theoretical framework for simulating optical processes in light-harvesting complexes.
  • The developed mixed Heisenberg-Schrödinger scheme facilitates multi-dimensional spectroscopy evaluation.