J. D. Lee Solutions for Chapter: Group 8 - the Iron Group, Exercise 1: Exercise 1

Describe how iron is extracted from its ores, and how it is converted into steel.

What are pig iron, wrought iron, mild steel, high carbon steel and stainless steel?

Predict the nature of the ligands in the following complexes:
$\left(\mathrm{a}\right)$ ${\left[\mathrm{Fe}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+},$ $\left(\mathrm{b}\right)$ ${\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]}^{4-}$ and $\left(\mathrm{c}\right)$ ${\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]}^{3-}.$ How many unpaired electrons are there in each complex, and what would you expect their magnetic moments to be?

Iron pentacarbonyl has a trigonal bipyramidal structure, yet the ${}^{13}\mathrm{C} \mathrm{NMR}$ spectrum of $\mathrm{Fe}{\left({}^{13}\mathrm{CO}\right)}_5$ shows only a single peak even when the sample is held at low temperatures. Two peaks would be expected for a trigonal bipyramidal molecule. (The ${}^{13}\mathrm{C}$ nucleus has a spin of $\frac{1}{2}$ and behaves in much the same way as a proton in $\mathrm{NMR}.$) Explain the unusual spectrum.

Compare and contrast the structures of heme, vitamin ${\mathrm{B}}_{12}$ and chlorophyll.

Outline the essential features involved in the binding of ${\mathrm{O}}_2$ to the myoglobin molecule.

Write a critical account of the various ways in which the nine elements in the iron, cobalt and nickel groups have been grouped together for comparison purposes.

Give examples of compounds containing metal-metal bonds: