The structure of the singlet state (1A1) of [Fe(CO)4] in the gas phase (see picture) has been determined by a combination of laser photochemistry of [Fe(CO)5] and electron diffraction imaging. The ground state of [Fe(CO)4] is known to be a triplet species (3B2), and this is the species detected in picosecond time-resolved IR experiments with [Fe(CO)5] in solution. This is an appropriate moment to survey the state of knowledge on [Fe(CO)4], beginning from the first low-temperature matrix experiments.
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Poliakoff et al. (2001) studied this question.
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