3. (10 marks) When silver nitrate reacts with the molecular base ortho-phenanthr

Question

3. (10 marks) When silver nitrate reacts with the molecular base ortho-phenanthroline, color- less crystals form that contain the transition-metal complex shown below a. What is the coordination geometry of silver in this complex? b. Assuming no oxidation or reduction occurs during the reaction, what is the charge of the complex shown here? c. Do you expect any nitrate ions to be present in the crystal? d. Write a formula for the compound that forms in this reaction. e. Use the accepted nomenclature to write the name of this com- Ag pound.

Explanation / Answer

a) As seen from the figure given, a bond is above and one bond is below the plane. This indicates a tetrahedral structure. If it were square planar, all bonds would be in plane.

b) Initally the reactant is AgNO3, hence Silver has an oxidation state of +1. (Ag+ NO3-)

Since no oxidation or reduction happens in the reaction so, Ag will still have +1 oxidation state. Ortho-phenanthroline is neutral ligand hence the charge of the complex will be same as charge of Ag+. the complex thus has a single positive charge.

c) The crystal formed will be chargeless, hence to neutralize the single positive charge on the complex, the crystal will have a nitrate ion (NO3-) associated with it.

d) The orthophenanthroline can be abbreviated as, C12H8N2

The complex can be written as [Ag(C12H8N2)2]NO3

e) The ligand name is 1,10-phenanthroline

the complex name is: bis(1,10-phenanthroline)silver(I) nitrate

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