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Redox Reactions with Calcium-Metal Nanoparticles.

Christian Ritschel1, Anja Appenzeller2, Radian Popescu3

  • 1Institute of Inorganic Chemie, Karlsruhe Institute of Technology (KIT), Engesserstraße 15, D-76131, Karlsruhe, Germany.

Angewandte Chemie (International Ed. in English)
|October 25, 2025
PubMed
Summary
This summary is machine-generated.

Researchers synthesized novel calcium (Ca(0)) nanoparticles, significantly enhancing reactivity for chemical synthesis. These nanoparticles differ from Rieke calcium and enable the creation of new compounds, showcasing the potential of nanosized metals.

Keywords:
Calcium nanoparticlesCrystal‐structure analysisDative bondingGold clusterReactivity

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Bulk calcium metal exhibits low reactivity due to its surface area, solubility, and passivation.
  • Nanosized calcium (Ca(0)) nanoparticles offer significantly enhanced reactivity compared to bulk metal.
  • Existing methods for preparing reactive calcium, like Rieke calcium, have limitations.

Purpose of the Study:

  • To synthesize and characterize novel, highly reactive Ca(0) nanoparticles.
  • To demonstrate the enhanced reactivity of these nanoparticles in redox reactions.
  • To explore the potential of Ca(0) nanoparticles for synthesizing new inorganic and organometallic compounds.

Main Methods:

  • Synthesis of Ca(0) nanoparticles (5.4 ± 1.2 nm) via TMEDA-supported reduction of CaI2 with lithium naphthalenide in toluene.
  • Redox reactions involving Ca(0) nanoparticles with metal precursors like [Cp2MoCl2] and [(Ph3P)AuCl].
  • Characterization using electron microscopy, X-ray diffraction (single crystal and powder), IR, UV-Vis, NMR, EPR spectroscopy, and computation.

Main Results:

  • Successful synthesis of Ca(0) nanoparticles, distinct from Rieke calcium.
  • Formation of novel compounds: [{(DippNacNac)(thf)Ca}2(naph)] (1) featuring a naphthalenide dianion, [{(DippNacNac)(thf)CaMo(Cp)H}2(fulvalene)] (2) with unusual MoH→Ca dative bonding, and [Au9(PPh3)8](naph)(tmeda)0.5 (3) with a zerovalent gold Au9 cluster.
  • Demonstration of Ca(0) nanoparticles' high reactivity in redox processes.

Conclusions:

  • Nanosized alkaline-earth metals, specifically Ca(0) nanoparticles, possess significantly enhanced reactivity compared to their bulk counterparts.
  • The synthesized Ca(0) nanoparticles are valuable reagents for novel chemical syntheses, leading to unique compounds.
  • This work highlights the distinct properties and synthetic potential of nanosized metals in inorganic chemistry.