The intense colour of the latter complex is strongly suggestive of a
charge transfer transition and since the metal is already fully
reduced (zero oxidation state), it is highly likely that this
involves a MLCT transition. The π* levels of the bipy or CO ligands are possible acceptors but
the fact that Fe(CO)5 doesn’t show this colour
suggests that it is the bipy π* levels that are involved in Fe(bipy)(CO)3. Since there should be
MLCT transitions to the CO π* levels as well, we assume that the lack of
colour for Fe(CO)5 means that these
transitions fall in the UV rather than the visible.
Why Fe(CO)5 is colourless while Fe(bipy)(CO)3 is intensely purple in colour ?
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