On the other hand, the thermal decomposition product medium
favors besides a partial reduction of iron ions,
their coordination with HO (8). On heating, the
complex intermediates are converted into different
iron hydroxides and oxyhydroxides species, via successive
oxidation and dehydrogenation processes
((9)–(13)). The presence of CO2 and the oxygen deficit
of the reaction medium promote the formation in a
small extent, of green rust (II) (14), which further is
converted into an oxyhydroxide (15).