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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

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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.
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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

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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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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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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...
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Dispersion-corrected r2SCAN based double-hybrid functionals.

Lukas Wittmann1, Hagen Neugebauer1, Stefan Grimme1

  • 1Mulliken Center for Theoretical Chemistry, Beringstraße 4, D-53115 Bonn, Germany.

The Journal of Chemical Physics
|December 8, 2023
PubMed
Summary
This summary is machine-generated.

New double-hybrid functionals based on r2SCAN show improved performance for main-group and metal-organic thermochemistry. Optimized variants outperform existing methods, offering robust and broadly applicable computational chemistry tools.

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Area of Science:

  • Computational Chemistry
  • Quantum Chemistry
  • Density Functional Theory

Background:

  • The development of accurate and efficient exchange-correlation functionals is crucial for predicting chemical properties.
  • Semi-local meta-generalized gradient approximation (meta-GGA) functionals, like r2SCAN, offer a balance between accuracy and computational cost.
  • Global double-hybrid functionals combine elements of GGA, meta-GGA, and hybrid functionals to improve performance.

Purpose of the Study:

  • To develop and assess novel adiabatic-connection-derived global double-hybrid functionals using the r2SCAN functional.
  • To investigate the impact of varying Hartree-Fock exchange (HFX) percentages and MP2-regularization on functional performance.
  • To evaluate the performance of these new functionals against established benchmarks for thermochemistry.

Main Methods:

  • Creation of double-hybrid functionals from the r2SCAN meta-GGA functional.
  • Empirical optimization of functionals with 50% and 69% HFX (Pr2SCAN50, Pr2SCAN69).
  • Inclusion of MP2-regularization (κPr2SCAN50) and range-separated HFX (ωPr2SCAN50) variants.
  • Combination with London dispersion corrections (D4, NL) and comprehensive testing on 90 benchmark sets (25,800 data points).

Main Results:

  • Optimized functionals, particularly ωPr2SCAN50-D4, Pr2SCAN69-D4, and Pr2SCAN50-D4, demonstrate superior performance in main-group and metal-organic thermochemistry.
  • All four developed functionals (Pr2SCAN69-D4, Pr2SCAN50-D4, κPr2SCAN50-D4, ωPr2SCAN50-D4) outperform the reference PWPB95-D4 functional.
  • Variants with moderate HFX (50%) show robust performance across diverse chemical systems.

Conclusions:

  • The developed r2SCAN-based double-hybrid functionals represent a significant advancement in computational thermochemistry.
  • These functionals offer improved accuracy and robustness for both main-group and transition-metal chemistry applications.
  • The study highlights the potential of combining meta-GGA with double-hybrid approaches for high-performance electronic structure calculations.