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Complexation Equilibria: Overview

Complexation Equilibria: Overview

Complexation reactions take place when dative or coordinate covalent bonds form between metal ions and ligands. The compounds formed in these reactions are called coordination compounds. The number of bonds formed between the metal ion and the ligands is called its coordination number. Generally, most metal ions in an aqueous solution are solvated by water molecules and thus exist as aqua complexes.
The equilibrium constant of the complexation reaction is represented as the formation constant...

Complexation Equilibria: Factors Influencing Stability of Complexes

Complexation Equilibria: Factors Influencing Stability of Complexes

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...

Valence Bond Theory

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...

Metal-Ligand Bonds

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...

Complexometric Titration: Ligands

Complexometric Titration: Ligands

Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...

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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Related Experiment Video

Updated: May 23, 2026

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)

Published on: December 29, 2016

Pivaloylmetals (tBu-COM: M = Li, MgX, K) as equilibrium components.

R Knorr¹, G Böhrer, B Schubert

¹Department Chemie der Ludwig-Maximilians-Universität, Butenandtstrasse 5-13 (Haus F), 81377 München, Germany. rhk@cup.uni-muenchen.de

Chemistry (Weinheim an Der Bergstrasse, Germany)

|April 17, 2012

Summary

Short-lived pivaloylmetals are reactive intermediates formed from overcrowded metal alkoxides. These intermediates rapidly dimerize or react with ketones, but their overall decay is slow due to competing processes.

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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)

Published on: December 29, 2016

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Area of Science:

Organometallic Chemistry
Reaction Mechanisms

Background:

Overcrowded metal alkoxides are precursors to reactive intermediates.
Understanding the reactivity of short-lived organometallic species is crucial for synthetic chemistry.

Purpose of the Study:

To investigate the formation and reactivity of short-lived pivaloylmetal intermediates.
To elucidate the mechanisms of dimerization, ketone trapping, and return processes.

Main Methods:

Thermal decomposition of overcrowded metal alkoxides (MgX, Li, K).
Trapping experiments using deuterated ketones and other nucleophiles.
Kinetic analysis to determine reaction rates and pathways.

Main Results:

Short-lived pivaloylmetals ((H(3)C)(3)C-COM) are generated via thermal heterolytic fission.
These intermediates undergo rapid dimerization to enediolates or react with ketones.
A significant return process competes with product formation, leading to slow overall decay rates for Li and K precursors.

Conclusions:

The reactivity of pivaloylmetal intermediates is complex, involving competing fission, return, and dimerization pathways.
Kinetic partitioning heavily favors the return process for Li and K intermediates.
The basicity of the metal influences subsequent reactions, such as protonation.