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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Ligand-Mediated Nucleation and Growth of Palladium Metal Nanoparticles
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Pathway-dependent Metallosupramolecular Polymerization Regulated by Ligand Geometry.

Papri Sutar1,2, Iván Maisuls3, Zulema Fernández1

  • 1Universität Münster, Organisch-Chemisches Institut, Corrensstraße 36, Münster, 48149, Germany.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|September 24, 2024
PubMed
Summary
This summary is machine-generated.

Ligand geometry in platinum(II) complexes dictates self-assembly pathways and photophysical properties. V-shaped complexes form luminescent spherical assemblies, while linear ones yield 1D polymers.

Keywords:
Pathway complexityPt(II) complexesSelf-assemblySupramolecular polymerizationπ-conjugated systems

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Area of Science:

  • Supramolecular chemistry
  • Materials science
  • Photochemistry

Background:

  • Structure/property correlations are crucial for functional material development in self-assembly.
  • Tuning photophysical properties and self-assembly requires precise control over molecular geometry.

Purpose of the Study:

  • Investigate the impact of ligand geometry on metallosupramolecular polymerization.
  • Fine-tune photophysical properties (MMLCT vs. MLCT excited states) and self-assembly pathways.
  • Design and synthesize novel platinum(II) complexes with varied geometries.

Main Methods:

  • Synthesis of two hydrophobic Pt(II) complexes with π-extended bidentate bipyridine ligands.
  • Comparative studies of photophysical properties and self-assembly in non-polar media.
  • Analysis of molecular geometry (linear vs. V-shaped) and its influence on assembly.

Main Results:

  • V-shaped complex 1 forms luminescent spherical assemblies via a single-step pathway, exhibiting MMLCT states and short Pt⋅⋅⋅Pt contacts.
  • Linear complex 2 self-assembles in a two-step competitive process, forming 1D polymers with slipped packing and MLCT emission.
  • Ligand geometry significantly alters self-assembly behavior and excited-state characteristics.

Conclusions:

  • Ligand geometry is a key design element for controlling self-assembly and photophysical properties in Pt(II) metallosupramolecular systems.
  • Findings provide design guidelines for creating luminescent supramolecular assemblies.
  • Expands the scope of monomers for supramolecular polymerization.