The hydrogen bridged dimer B2H6 contains two three centre (3C-2e bond), two electron bonds, A three-centre
bond uses two electron to link three atoms, and four two centre, two electron bond (2C-2e).
3C-2e bridge bond is perpendicular to plane in which 2C-2e bond present.
In contrast the bridge bonding in Al2Cl6
contains two three centre (3C-4e bond), four electron bonds which can
be described in terms of electron pair bond in which a chlorine atom bonded to
one aluminium atom act as a Lewis base by donating a lone pair of electrons to
the aluminium atom which acts as a Lewis acid.
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