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Related Concept Videos

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

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

780
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...
780
Coordination Number and Geometry02:57

Coordination Number and Geometry

15.2K
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
15.2K
¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

1.0K
The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
1.0K
[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

2.6K
The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
2.6K
Structural Isomerism02:34

Structural Isomerism

19.0K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly,...
19.0K
Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

5.6K
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...
5.6K

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Updated: May 12, 2025

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex

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Rhenium coordination-induced conformational modulation in nitrogen-doped nanographene.

Eldhose V Varghese1, Yi-Hung Liu2, Hsing-Yin Chen1

  • 1Department of Medicinal and Applied Chemistry, Kaohsiung Medical University 80708 Kaohsiung Taiwan chc@kmu.edu.tw.

Chemical Science
|May 8, 2025
PubMed
Summary
This summary is machine-generated.

Metal coordination alters nanographene structure, impacting its properties. This study shows rhenium coordination changes nanographene conformation and enhances its catalytic activity for hydrogen evolution.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Catalysis

Background:

  • Nanographene conformation significantly influences its electronic, mechanical, and optical properties.
  • Understanding these conformational changes is vital for advancing various scientific and technological applications.
  • Metal coordination is a key factor that can modify nanographene structures.

Purpose of the Study:

  • To investigate the structural conformation changes in nanographene upon coordination with a metal (rhenium).
  • To synthesize and characterize nitrogen-doped nanographene-rhenium complexes.
  • To evaluate the catalytic activity of these complexes in the electrocatalytic hydrogen evolution reaction.

Main Methods:

  • Synthesis of nitrogen-doped nanographenes and their rhenium complexes.
  • Analysis of complex conformations using various spectroscopic techniques.
  • X-ray crystallography to compare structures before and after rhenium coordination.

Main Results:

  • Rhenium coordination was confirmed to induce significant conformational changes in the nanographene structure.
  • The synthesized nanographene-rhenium complexes demonstrated catalytic activity for the hydrogen evolution reaction (HER).
  • One complex achieved hydrogen production at a low overpotential (133 mV) with acetic acid as a weak acid co-catalyst.

Conclusions:

  • Metal coordination is an effective strategy to tune nanographene conformation and properties.
  • Nanographene-rhenium complexes show promise as electrocatalysts for hydrogen production.
  • The findings open avenues for designing novel nanographene-based materials for catalysis.