Chapter 22, Problem 22.51QP

Interpretation Introduction

Interpretation:

Structural formula for the following compounds has to be written.

 (a) potassium hexacyanomanganate (III)

 (b) sodium tetracyanozincate(II)

 (c) tetramminedichlorocobalt(III) nitrate

 (d) hexaamminechromium(III) tetrachlorocuprate (II)

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 -

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