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Updated: Mar 17, 2026
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Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI
Published on: November 22, 2016
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Coordination Chemistry at the Hard-Soft Interface: Phosphine Oxide-Based Rare Earth/Transition Metal Complexes
Rwitabrita Panda1, Franziska Flecken1, Christina Papke1
1Institute for Inorganic Chemistry, Karlsruhe Institute of Technology, Engesserstr. 15, Karlsruhe 76131, Germany.
ACS Omega
|March 16, 2026
Summary
This study synthesized rare earth (RE) metal complexes using tetraphenyldiphosphine monoxide (PPO). Researchers developed a novel method to create RE/Mo heterobimetallic complexes, demonstrating solvent-controlled structural diversity.
Area of Science:
- Inorganic Chemistry
- Coordination Chemistry
- Materials Science
Background:
- Tetraphenyldiphosphine monoxide (PPO) serves as a versatile ligand in coordination chemistry.
- Rare earth (RE) and transition metal (TM) complexes are crucial in various catalytic and material applications.
- Synthesizing heterobimetallic complexes with distinct metal centers presents significant challenges.
Purpose of the Study:
- To synthesize and characterize novel monometallic RE-PPO complexes.
- To explore the construction of RE/TM heterobimetallic assemblies.
- To investigate the influence of solvent environment on the structural diversity of these complexes.
Main Methods:
- Synthesis and characterization of Al(III), Sm(III), Dy(III), Er(III), and Yb(III) complexes with PPO.
- Exploration of direct incorporation of soft TMs (Cu(I), Au(I)) into RE-PPO synthons.
- Development of an alternative route using a presynthesized Mo-PPO synthon for RE/Mo heterobimetallic complex formation.
- Structural analysis of complexes synthesized in different solvent environments (dichloromethane, THF, MeCN).
Main Results:
- Direct incorporation of Cu(I) and Au(I) into RE-PPO synthons was challenging, yielding undesired TM-based species.
- A successful route to RE/Mo heterobimetallic complexes was established using a presynthesized Mo-PPO synthon.
- Solvent choice significantly impacted molecular structures; noncoordinating solvents (e.g., dichloromethane) led to chloride-bridged RE2 complexes, while coordinating solvents (THF, MeCN) did not.
- This solvent-dependent structural divergence provides a method to control metal nuclearity.
Conclusions:
- The study highlights the challenges and offers a successful strategy for synthesizing RE/Mo heterobimetallic complexes.
- Solvent-controlled assembly offers a facile approach to modulate the nuclearity and structure of metal complexes.
- These findings contribute to the rational design of complex inorganic materials with tunable properties.
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