Coordination Chemistry Overview

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Questions and Answers

What is the primary role attributed to Amavadin?

As a ligand

As a chelating agent

As a Lewis acid

As a peroxidase (correct)

All metal ions exhibit the same strength of Lewis acidity across the periodic table.

False

Explain what defines a chelating ligand.

A chelating ligand is a multidentate ligand that coordinates to a metal ion using more than one donor atom, forming a ring with the metal.

In the equation ΔG = ΔH - TΔS, ΔG represents the change in ________ of a chemical reaction.

Gibbs free energy Signup and view all the answers

Match the following terms with their definitions:

Brønsted acid = A compound that donates protons Lewis acid = An electron pair acceptor Chelating ligand = A ligand that forms multiple bonds with a metal Complex stability = The tendency of a complex to resist dissociation Signup and view all the answers

Which of the following describes the coordination compound with the formula [Cu(NH3)4]SO4?

Copper(II) sulfate tetraammine Signup and view all the answers

Coordination compounds can only have metal ions as central atoms.

False Signup and view all the answers

What is the chemical formula for a complex containing cobalt with six water molecules as ligands?

[Co(H2O)6]Cl3 Signup and view all the answers

A complex with the formula [Ni(en)3]Cl2 is named _____.

tris(ethylenediamine)nickel(II) chloride Signup and view all the answers

What is typically the highest oxidation state for transition metals in coordination compounds?

+8 Signup and view all the answers

Match the following coordination compounds to their corresponding ligands:

[Ag(NH3)2]Cl = Ammonia [CuCl4]2- = Chloride [Co(en)3]3+ = Ethylenediamine [Fe(CN)6]4- = Cyanide Signup and view all the answers

The formula [Cr(H2O)5Cl]Br represents a coordination compound.

True Signup and view all the answers

What is the primary distinction in naming between a coordination compound and a regular ionic compound?

Coordination compounds use prefixes and indicate the number of ligands. Signup and view all the answers

Which of the following ligands is hexadentate?

EDTA Signup and view all the answers

The donor atom of the ligand water is nitrogen.

False Signup and view all the answers

Name a ligand that acts as a bidentate ligand.

Bipyridine Signup and view all the answers

The ligand ethylenediamine is classified as a ____________ ligand.

bidentate Signup and view all the answers

Match the following ligands with their corresponding donor atoms:

Water = Oxygen Ammonia = Nitrogen Cyanide = Carbon Ethylenediamine = Nitrogen and Oxygen Signup and view all the answers

Which of the following statements about ligand exchange is true?

Thermodynamic stability affects the rate of ligand exchange. Signup and view all the answers

F- is considered a strong field ligand.

False Signup and view all the answers

What is the chemical formula for a complex formed with Ru and clotrimazole?

Ru(clotrimazole) Signup and view all the answers

Study Notes

Amavadin

Amavadin is a compound found in toadstools.
It is thought to act as a peroxidase.
Its role has not been fully explored.

Brønsted Acidity of Metal Aqua Complexes

All metal ions are Lewis acids (electron pair acceptors).
Their Lewis acidity increases across the periodic table and with increasing positive charge.
The formation of metal aqua complexes results in the formation of a Brønsted acid (H3O+).
The pKa of the solution depends on the Lewis acidity of the metal.

Chelating Ligands and Chelating Effect

A multidentate ligand that coordinates to a metal ion using more than one donor atom is a chelating ligand.
The resulting compound is a chelate complex.
The chelating effect is the increased stability of a chelate complex compared to a complex with monodentate ligands.
The chelating effect is driven by entropy as the number of particles increases in the reaction.

Ligands

Ligands are atoms or molecules that can donate electrons to a metal ion.
Common ligands include water, ammonia, carbon monoxide, fluoride ion, chloride ion, hydroxide ion, ethylenediamine (en), bis(ethylene)triamine (trien), cyanide ion, thiocyanate ion, nitrite ion, and nitrate ion.
The denticity of a ligand is the number of donor atoms that can coordinate to a metal ion.

CuSarTATE

CuSarTATE is a copper complex that can be used as a 64Cu radiotracer for imaging using positron emission tomography.

Ru Complex of Clotrimazole

The Ru complex of clotrimazole is an antiparasitic agent against Trypanosoma cruzi.

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Description

This quiz covers key concepts in coordination chemistry, including the role of chelating ligands, Brønsted acidity of metal aqua complexes, and specific compounds like Amavadin. Test your knowledge on how these aspects contribute to the stability and reactivity of metal complexes.