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Related Concept Videos

Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

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Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
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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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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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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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Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule01:10

Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule

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In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
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¹H NMR: Complex Splitting01:13

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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.
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¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

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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...
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Related Experiment Video

Updated: Jan 5, 2026

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Chiral Discrimination by a Binuclear Pd Complex Sensor Using 31P{1H} NMR.

Zhongxiang Chen1,2, Mingxue Yang1,2, Zhaofeng Sun1,2

  • 1The Key Laboratory of Coal to Ethylene Glycol and Its Related Technology , Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences , Fuzhou , Fujian 350002 , China.

Analytical Chemistry
|October 29, 2019
PubMed
Summary
This summary is machine-generated.

A novel palladium complex (BPHP) acts as a chiral sensor, distinguishing various molecules like amino acids and diols using phosphorus NMR. This method enables precise chiral discrimination through the formation of stable diastereomeric complexes.

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Area of Science:

  • Coordination Chemistry
  • Chiral Sensing
  • Nuclear Magnetic Resonance (NMR) Spectroscopy

Background:

  • Chiral discrimination is crucial in various scientific fields, including pharmaceuticals and materials science.
  • Developing efficient and selective chiral sensors remains a significant challenge in analytical chemistry.
  • Axially chiral metal complexes offer unique structural properties for molecular recognition.

Purpose of the Study:

  • To develop a novel axially chiral binuclear μ-hydroxo palladium complex (BPHP) as a chiral sensor.
  • To investigate the ability of BPHP to discriminate a wide range of chiral analytes.
  • To elucidate the mechanism of chiral recognition employed by the BPHP sensor.

Main Methods:

  • Synthesis and characterization of the axially chiral binuclear μ-hydroxo palladium complex (BPHP).
  • Application of BPHP as a sensor for chiral analytes including amino alcohols, amino amides, amino acids, mandelic acid, diols, diamines, and monoamines.
  • Utilized 31P{1H} NMR spectroscopy for detecting and quantifying chiral discrimination.
  • Employed single crystal X-ray diffraction and mass spectrometry to study the recognition mechanism.

Main Results:

  • The BPHP complex demonstrated excellent performance as a chiral sensor, successfully discriminating various chiral molecules.
  • Well-distinguishable split 31P{1H} NMR signals were observed for different enantiomers of the analytes.
  • The proposed recognition mechanism involves the Pd-OH group of BPHP extracting acidic hydrogen from analytes, forming stable diastereomeric complexes.

Conclusions:

  • The BPHP complex is a highly effective chiral sensor for a diverse range of analytes.
  • The 31P{1H} NMR technique, coupled with the BPHP sensor, provides a robust method for chiral discrimination.
  • The study provides valuable insights into the molecular interactions governing chiral recognition by metal complexes.