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Related Concept Videos

Radical Halogenation: Stereochemistry01:33

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The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
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Radicals: Electronic Structure and Geometry01:07

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This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
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The chiral α-carbon of the carbonyl compound is the stereocenter of the molecule. As shown in the figure below, when such a carbonyl compound undergoes racemization under an acidic or basic condition, an achiral enol is formed.
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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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Density Functional Theory Calculation on the Racemization Mechanism of Metal-Induced Axial Chirality: Axial Rotation

Wenjing Dong1, Bao Zhang1, Bo Tu1

  • 1College of Chemistry, Sichuan University, Chengdu 610064, P. R. China.

Inorganic Chemistry
|March 19, 2026
PubMed
Summary
This summary is machine-generated.

This study reveals a novel racemization mechanism in platinum(II) complexes, involving a switch from four- to three-coordinate geometry. This pathway explains lower energy barriers for axial chirality, aiding the design of new chiral metal complexes.

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Area of Science:

  • Coordination Chemistry
  • Stereochemistry
  • Organometallic Chemistry

Background:

  • Axially chiral molecules display atropisomerism, with racemization barriers usually dictated by steric hindrance.
  • Metal-induced axial chirality in platinum(II) complexes presents unique racemization mechanisms.

Purpose of the Study:

  • Investigate the racemization mechanism of metal-induced axial chirality in square-planar binuclear Pt(II) complexes.
  • Explore an alternative racemization pathway beyond simple axial rotation.

Main Methods:

  • Experimental determination of racemization barrier.
  • Density functional theory (DFT) simulations to model the racemization pathway.
  • Computational analysis of coordination geometry changes and bond rotations.

Main Results:

  • The Pt(II) complex with bulky methyl groups exhibited a lower experimental racemization barrier (34.4 kcal/mol) than 1,1'-binaphthol (40.5 kcal/mol).
  • DFT simulations supported a novel mechanism involving a four- to three-coordinate transition.
  • Calculated energy barriers for the proposed pathway ranged from 34.0 to 40.4 kcal/mol.

Conclusions:

  • A novel racemization mechanism involving a change in coordination geometry is proposed for chiral-at-metal complexes.
  • This mechanism provides insights into the observed low racemization barriers.
  • Findings facilitate the rational design of novel chiral-at-metal complexes.