Chapter 22.4, Problem 22.2E

Interpretation Introduction

Interpretation:

Structural formula for the following compounds has to be written.

 (a) potassium hexacyanoferrate (II)

 (b) tetraamminedichlororcobalt(III) chloride

 (c) tetrachloroplatinate(II) ion.

Concept Introduction:

Complex compounds are primarily formed by transition elements which are d-block elements.  A co-ordination compound is known as a complex compound is made of metal atom/ion and ligand(s).  Ligands are considered as Lewis bases and the central metal atom is Lewis acid.  Ligands donate a pair of electron to metal ion and establish bonding with metal ion which is known as co-ordinate bond and hence these compounds are named as co-ordination compounds.  The ligands represented inside the square brackets adjacent to the central metal ion, which is termed as co-ordination sphere.

Oxidation number of transition metal in its co-ordination compound refers to charge of the metal atom or ion.  It is calculated as -

$oxidation\text{ number = charge on complex ion - total charge of ligands}$