Dinuclear iron carbonyl complex , which contains an elongated unsupported Fe-Fe bond, was synthesized by the reaction between Fe(CO) and phosphinyl radical . Thermal Fe-Fe bond homolysis led to the generation of a four-coordinate carbonyl-based iron-centered radical, , which is stabilized by π-donation. Complex exhibited high reactivity toward organic radicals to form diamagnetic five-coordinate Fe(ii) complexes.
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