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Formation of Complex Ions

Formation of Complex Ions

A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...

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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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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...

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Zinc-silylene complexes.

Sebastian Schäfer¹, Ralf Köppe, Michael T Gamer

¹Institut für Anorganische Chemie, Karlsruher Institut für Technologie (KIT), Engesserstraße 15, 76131 Karlsruhe, Germany. roesky@kit.edu.

Chemical Communications (Cambridge, England)

|August 16, 2014

Summary

This summary is machine-generated.

This study reports the synthesis of novel zinc-silylene complexes through reactions involving a chlorosilylene and organozinc compounds. These findings represent the first examples of stable zinc-silylene coordination chemistry.

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Area of Science:

Organometallic Chemistry
Silicon Chemistry
Coordination Chemistry

Background:

Silylenes are reactive silicon species.
Organozinc compounds are versatile reagents in synthesis.

Purpose of the Study:

To synthesize and characterize novel zinc-silylene complexes.
To explore the reactivity of chlorosilylenes with organozinc reagents.

Main Methods:

Reaction of a chlorosilylene with various organozinc compounds (Zn(C5Me5)2, ZnPh2, ZnEt2).
Characterization of the resulting zinc-silylene complexes using spectroscopic techniques and X-ray crystallography (implied).

Main Results:

Successful synthesis of the first zinc-silylene complexes.
Observed exchange of the chlorine atom of the silylene and organic groups of the zinc atom.
Formation of different complex structures based on the organozinc reagent used, including monomeric and dimeric species, and a disilylene complex.

Conclusions:

The reaction conditions and the nature of the organozinc reagent dictate the structure of the resulting zinc-silylene complex.
This work expands the known coordination chemistry of silylenes with main group elements.