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Monday, December 30, 2019

What is the difference between the structure of AlCl3 and diborane?

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.

2 comments:

  1. Could u show AlCl3 structure? Too

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    1. https://www.chemzipper.com/2019/12/four-center-two-electron-bond-4c-2e.html?m=1

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