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Chirality in distorted square planar Pd(O,N)2 compounds.

Henri Brunner1, Michael Bodensteiner, Takashi Tsuno

  • 1Institut für Anorganische Chemie, Universität Regensburg, Regensburg, Germany.

Chirality
|July 11, 2013
PubMed
Summary
This summary is machine-generated.

Palladium(II) complexes with salicylidenimine ligands adopt step or bowl shapes, influencing their chirality. Chiral ligands induce specific configurations in these palladium complexes, impacting crystal structures and catalytic properties.

Keywords:
Pd(O,N)2 compoundssalicylidenimine palladium(II) complexessquare chiralityΔ/Λ configuration

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Area of Science:

  • Coordination Chemistry
  • Stereochemistry
  • Organometallic Chemistry

Background:

  • Salicylidenimine palladium(II) complexes, denoted as trans-Pd(O,N)2, exhibit distinct step and bowl structural arrangements.
  • Stereochemical analysis reveals 52 compounds classified into 41 step and 11 bowl types based on their geometry.

Purpose of the Study:

  • To investigate the stereochemical outcomes of chiral N-substituents and atropisomerism in salicylidenimine palladium(II) complexes.
  • To analyze the relationship between ligand chirality and the resulting chirality of the palladium(II) square planar system.
  • To explore the implications of these chiral distortions in dimeric complexes and their crystal packing.

Main Methods:

  • Stereochemical analysis of 52 salicylidenimine palladium(II) complexes.
  • Classification of complexes into step and bowl arrangements.
  • Investigation of chiral distortions induced by N-substituents and atropisomerism.

Main Results:

  • Step and bowl complexes with chiral N-substituents induce chiral distortions, leading to Δ/Λ configurations in the Pd(O,N)2 unit.
  • Enantiomerically pure N-substituents result in specific square chirality and single diastereomer assembly.
  • Dimeric complexes exhibit inherent chirality with varying chirality patterns and co-crystallization of diastereomers.

Conclusions:

  • Ligand chirality dictates the square chirality of palladium(II) complexes, influencing their solid-state structures.
  • Atropisomerism plays a significant role in defining configurations within bowl systems.
  • The study highlights rare stereochemical phenomena, including the co-crystallization of diastereomers with opposite square configurations.