![]() Organic molecules are often cyclic compounds containing one or more rings, such as benzene, and are often made up of many sigma bonds along with pi bonds. These sigma bonds can be supplemented with other bonding interactions, such as π-back donation, as in the case of W(CO) 3( PCy 3) 2(H 2), and even δ-bonds, as in the case of chromium(II) acetate. Transition metal complexes that feature multiple bonds, such as the dihydrogen complex, have sigma bonds between the multiple bonded atoms. For example, propane is described as consisting of ten sigma bonds, one each for the two C−C bonds and one each for the eight C−H bonds. The concept of sigma bonding is extended to describe bonding interactions involving overlap of a single lobe of one orbital with a single lobe of another.
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