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Full P4 to P3- Reduction with a Redox-Active Metal Crown Complex
Johannes Maurer1, Marcel A Schmidt1, Michael Nägel1
1Inorganic and Organometallic Chemistry, Universität Erlangen Nürnberg, Egerlandstrasse1, Erlangen, 91058, Germany.
Angewandte Chemie (International Ed. in English)
|September 1, 2025
Summary
Researchers achieved a selective reduction of elemental phosphorus (P4) at room temperature, yielding a novel hydrocarbon-soluble s-block metal complex containing the P3- anion. This discovery offers a new pathway for phosphorus chemistry.
Area of Science:
- Inorganic Chemistry
- Organometallic Chemistry
- Materials Science
Background:
- Traditional phosphorus compound synthesis relies on P4 oxidation, which is energy-intensive.
- Sustainable methods often involve reductive cleavage of P-P bonds, typically yielding large polyphosphide Zintl anions (Pm n-).
- Selective reduction of P4 to smaller anions remains a synthetic challenge.
Purpose of the Study:
- To develop a selective and sustainable method for the full reduction of P4.
- To synthesize and characterize a novel s-block metal complex featuring the P3- anion.
- To investigate the electronic structure and reactivity of the P3- anion.
Main Methods:
- Reductive cleavage of P4 using a redox-active metal crown complex, (BDI*)MgNa3N″2 (VI), at room temperature.
- Isolation and structural characterization of the resulting s-block metal phosphide complex (1) via X-ray crystallography.
- Density Functional Theory (DFT) calculations to determine the electronic structure and bonding.
- Reactivity studies to explore the chemical behavior of the P3- anion.
Main Results:
- Selective reduction of P4 to the P3- anion was achieved under mild conditions.
- A unique hydrocarbon-soluble complex, (BDI*)MgNa5N″3P (1), containing the P3- anion stabilized by Mg and Na ions, was synthesized.
- Crystal structure analysis revealed a strongly bound P3- anion coordinated by chelating sodium arms.
- DFT calculations confirmed the P3- anion as a full valence-shell species with four lone pairs and a highly ionic character.
- The P3- anion demonstrated versatile reactivity as a Brønsted base, nucleophile, and reducing agent.
Conclusions:
- The study reports a novel and selective route for P4 reduction to the P3- anion using a metal crown complex.
- The synthesized complex provides a stable platform for studying the unique properties and reactivity of the P3- anion.
- This work opens new avenues in phosphorus chemistry, offering a sustainable alternative to traditional synthesis methods.
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