 Roald Hoffmann was awarded with the Nobel Prize in chemistry for the development of the concept.The concept describes metal carbonyl fragments of M(CO)n as parts of octahedral building blocks in analogy to the tetrahedral CH3-, CH2- or CH- fragments in organic chemistry.In example Dimanganese decacarbonyl is formed in terms of the isolobal analogy of two d7Mn(CO)5 fragments, that are isolobal to the methyl radical CH3•.