Abstract
Mössbauer spectroscopic studies on the title complex and that of its pyridinium analogue are reported on samples of these materials previously heated in the temperature range 18–200 °C. The title complex is shown to be reduced to a mixture of iron(II) compounds at 200 °C. The use of ferrocenium as a smoke suppressant appears to have no advantage over that of ferrocene, as it is converted to ferrocene when heated in air in the presence of light.