Synthesis of Hexamminenickel (II) --> [Ni(H2O)6]Cl2(aq) + 6 NH3(aq) [Ni(NH3)6]Cl

Question

Synthesis of Hexamminenickel (II) --> [Ni(H2O)6]Cl2(aq) + 6 NH3(aq) [Ni(NH3)6]Cl2(aq) + 6 H2O (l)

1. Which are the coordination numbers of the reactants and products?

2. Write the formula of reactants and products and make a drawing of them

3. According to the colors which of them would be more stable

4. Draw the MO diagrams of the nickel complexes NiCl2•6H2O and the Ni(NH3)6Cl2

5. Explain the difference between the two MO diagrams

6. Indicate the point group of each compound (reactant and product).

7. Calculate the LFSE in terms of O and P for the nickel complex reactant (NiCl2•6H2O ) and the nickel complex product

Explanation / Answer

1.

The total number of points of attachment to the central element is termed the coordination number and this can vary from 2 to as many as 16, but is usually 6.

The coordination number of a complex is influenced by the relative sizes of the metal ion and the ligands and by electronic factors, such as charge which is dependent on the electronic configuration of the metal ion.

In both reactant and product Ni is attached with 6 molecules.So coordination number of both reactant and product is 6.

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