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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Halide-free diarylcalcium complexes--syntheses, structures, and stability.

Jens Langer1, Mathias Köhler, Helmar Görls

  • 1Institute of Inorganic and Analytical Chemistry, Friedrich Schiller University Jena, Humboldtstraße 8, 07743 Jena (Germany), Fax: (+49)4 3641-948132.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|February 13, 2014
PubMed
Summary
This summary is machine-generated.

Researchers developed a method to synthesize diarylcalcium complexes using potassium tert-butoxide and arylcalcium iodides. This process yields various mononuclear and dinuclear calcium complexes with distinct structures and bonding characteristics.

Keywords:
N ligandsSchlenk-type equilibriumcalciumdiarylcalciumdirect synthesis

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Area of Science:

  • Organometallic Chemistry
  • Calcium Chemistry
  • Synthetic Inorganic Chemistry

Background:

  • Calcium complexes are less explored compared to other alkaline earth metals.
  • Understanding the synthesis and structure of organocalcium compounds is crucial for catalysis and materials science.

Purpose of the Study:

  • To develop a general procedure for synthesizing diarylcalcium complexes.
  • To investigate the structural diversity of these complexes based on steric and electronic factors of ancillary ligands.

Main Methods:

  • Synthesis of arylcalcium iodides.
  • Reaction with potassium tert-butoxide in tetrahydrofuran (THF).
  • Isolation and characterization of resulting calcium complexes using X-ray diffraction and NMR spectroscopy.

Main Results:

  • A general procedure for diarylcalcium complex synthesis was established.
  • Various mononuclear and dinuclear complexes, including trans-[Ca(α-Naph)2(thf)4] and [Ca(Ph)2(tmeda)]2, were successfully isolated.
  • Characterization revealed varying Ca-C bond lengths (250.8–263.5 pm) and distinct NMR spectral features.

Conclusions:

  • The developed method provides access to a range of diarylcalcium complexes.
  • The steric and electronic properties of ancillary ligands significantly influence the nuclearity and structure of the complexes.
  • The study contributes to the understanding of organocalcium chemistry and reactivity.