The electron-deficient compound diborane, B2H6, as noted earlier, can be regarded as a cluster of atoms held together by pairs of delocalized electrons that extend their binding influence over all electrons in the molecule. The unusual feature of diborane is the existence of B―H―B bridges as part of the cluster. Although an MO treatment of the molecule deals with it as a whole, chemists find it helpful to focus on this novel feature and to consider each B―H―B moiety as an example of a three-centre, two-electron bond (a 3c,2e bond, as shown in Figure 19). They regard diborane as three ...(100 of 27318 words)