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Lecture

Preparation & Stabilities of Complexes

In course

CH-222: Coordination chemistry

Fundamental knowledge of coordination compounds. ...

Description

This lecture covers the preparation and stabilities of complexes, including redox reactions, direct reactions, substitution, photochemical reactions, and catalytic reactions. It discusses the kinetics, thermodynamics, ligand exchange, leaving groups, and complex formation, emphasizing the importance of formation constants and stability constants. The lecture also explores the influence of charge and size of metals on stability, the Irving Williams Series, and the Hard Soft Acid Base Theory. It delves into the strength of ligands, Bronsted acid-base theory, and the chelate effect in stabilizing different chelate rings.

Instructor

Wendy Lee Queen

Official source

Related concepts (32)

Stability constants of complexes

In coordination chemistry, a stability constant (also called formation constant or binding constant) is an equilibrium constant for the formation of a complex in solution. It is a measure of the strength of the interaction between the reagents that come together to form the complex. There are two main kinds of complex: compounds formed by the interaction of a metal ion with a ligand and supramolecular complexes, such as host–guest complexes and complexes of anions.

Ligand

In coordination chemistry, a ligand is an ion or molecule with a functional group that binds to a central metal atom to form a coordination complex. The bonding with the metal generally involves formal donation of one or more of the ligand's electron pairs, often through Lewis bases. The nature of metal–ligand bonding can range from covalent to ionic. Furthermore, the metal–ligand bond order can range from one to three. Ligands are viewed as Lewis bases, although rare cases are known to involve Lewis acidic "ligands".

Coordination complex

A coordination complex is a chemical compound consisting of a central atom or ion, which is usually metallic and is called the coordination centre, and a surrounding array of bound molecules or ions, that are in turn known as ligands or complexing agents. Many metal-containing compounds, especially those that include transition metals (elements like titanium that belong to the periodic table's d-block), are coordination complexes. Coordination complexes are so pervasive that their structures and reactions are described in many ways, sometimes confusingly.

Acid–base reaction

An acid–base reaction is a chemical reaction that occurs between an acid and a base. It can be used to determine pH via titration. Several theoretical frameworks provide alternative conceptions of the reaction mechanisms and their application in solving related problems; these are called the acid–base theories, for example, Brønsted–Lowry acid–base theory. Their importance becomes apparent in analyzing acid–base reactions for gaseous or liquid species, or when acid or base character may be somewhat less apparent.

Acid dissociation constant

In chemistry, an acid dissociation constant (also known as acidity constant, or acid-ionization constant; denoted K_a) is a quantitative measure of the strength of an acid in solution. It is the equilibrium constant for a chemical reaction HA A^- + H^+ known as dissociation in the context of acid–base reactions. The chemical species HA is an acid that dissociates into , the conjugate base of the acid and a hydrogen ion, .

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Introduces the basics of homogeneous catalysis, focusing on reaction mechanisms and catalyst design.

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Covers the thermodynamics of complexation chemistry, explaining metal-ligand complexes and the role of ligands in the environment.

Coordination Chemistry: Ligands and Geometries

Covers coordination numbers, common ligands, and preferred geometries in coordination chemistry, emphasizing the spatial distribution between ligands and the role of d⁸ electron configurations.

Isomers and Chirality: Understanding Coordination Complexes

Discusses isomers, chirality, and the stability of coordination complexes.

Complex Stability